Removed transitions and move to a Node based workflow element

2012-03-30 03:23:04 -04:00
parent 0717f346b0
commit a5280870c2
8 changed files with 559 additions and 75 deletions
--- a/apps/workflows/init.py
+++ b/apps/workflows/init.py
@@ -9,11 +9,9 @@ from .permissions import (PERMISSION_WORKFLOW_SETUP_VIEW,
    PERMISSION_WORKFLOW_SETUP_CREATE, PERMISSION_WORKFLOW_SETUP_EDIT,
    PERMISSION_WORKFLOW_SETUP_DELETE, PERMISSION_STATE_SETUP_VIEW,
    PERMISSION_STATE_SETUP_CREATE, PERMISSION_STATE_SETUP_EDIT,
-    PERMISSION_STATE_SETUP_DELETE, PERMISSION_TRANSITION_SETUP_VIEW,
-    PERMISSION_TRANSITION_SETUP_CREATE, PERMISSION_TRANSITION_SETUP_EDIT,
-    PERMISSION_TRANSITION_SETUP_DELETE)
-from .models import (Workflow, State, Transition, WorkflowState,
-    WorkflowStateTransition)
+    PERMISSION_STATE_SETUP_DELETE)
+    
+from .models import (Workflow, State, WorkflowState, WorkflowNode)

 setup_workflow_list_link = Link(text=_(u'workflow list'), view='setup_workflow_list', sprite='chart_organisation', permissions=[PERMISSION_WORKFLOW_SETUP_VIEW])
 setup_workflow_create_link = Link(text=_(u'create new workflow'), view='setup_workflow_create', sprite='chart_organisation_add', permissions=[PERMISSION_WORKFLOW_SETUP_CREATE])
@@ -33,34 +31,38 @@ setup_state_create_link = Link(text=_(u'create new state'), view='setup_state_cr
 setup_state_edit_link = Link(text=_(u'edit'), view='setup_state_edit', args='object.pk', sprite='transmit_edit', permissions=[PERMISSION_STATE_SETUP_EDIT])
 setup_state_delete_link = Link(text=_(u'delete'), view='setup_state_delete', args='object.pk', sprite='transmit_delete', permissions=[PERMISSION_STATE_SETUP_DELETE])

-setup_transition_list_link = Link(text=_(u'transition list'), view='setup_transition_list', sprite='chart_line', permissions=[PERMISSION_TRANSITION_SETUP_VIEW])
-setup_transition_create_link = Link(text=_(u'create new transition'), view='setup_transition_create', sprite='chart_line_add', permissions=[PERMISSION_TRANSITION_SETUP_CREATE])
-setup_transition_edit_link = Link(text=_(u'edit'), view='setup_transition_edit', args='transition.pk', sprite='chart_line', permissions=[PERMISSION_TRANSITION_SETUP_EDIT])
-setup_transition_delete_link = Link(text=_(u'delete'), view='setup_transition_delete', args='transition.pk', sprite='chart_line_delete', permissions=[PERMISSION_TRANSITION_SETUP_DELETE])
+setup_workflow_node_list_link = Link(text=_(u'node list'), view='setup_workflow_node_list', args='workflow.pk', sprite='chart_line', permissions=[PERMISSION_WORKFLOW_SETUP_EDIT])
+#setup_workflow_node_create_link = Link(text=_(u'create new transition'), view='setup_transition_create', sprite='chart_line_add', permissions=[PERMISSION_TRANSITION_SETUP_CREATE])
+setup_workflow_node_edit_link = Link(text=_(u'edit'), view='setup_workflow_node_edit', args='workflow_node.pk', sprite='chart_line_edit', permissions=[PERMISSION_WORKFLOW_SETUP_EDIT])
+#setup_workflow_node_delete_link = Link(text=_(u'delete'), view='setup_transition_delete', args='transition.pk', sprite='chart_line_delete', permissions=[PERMISSION_TRANSITION_SETUP_DELETE])

 bind_links(
    [
-        Workflow, State, Transition, WorkflowStateTransition,
+        Workflow, State,
        'setup_workflow_list', 'setup_workflow_create',
        'setup_state_list', 'setup_state_create',
-        'setup_transition_list', 'setup_transition_create',
+        #'setup_transition_list', 'setup_transition_create',
+        'setup_transition_create',
    ], [
-        setup_workflow_list_link, setup_state_list_link, setup_transition_list_link
+        setup_workflow_list_link, setup_state_list_link#, setup_transition_list_link
    ], menu_name=u'form_header')

-bind_links([Workflow], [setup_workflow_states_list_link, setup_workflow_edit_link, setup_workflow_delete_link])
+bind_links([Workflow], [setup_workflow_node_list_link, setup_workflow_states_list_link, setup_workflow_edit_link, setup_workflow_delete_link])
 bind_links([Workflow, 'setup_workflow_list', 'setup_workflow_create'], [setup_workflow_create_link], menu_name=u'secondary_menu')
 bind_links([WorkflowState, 'setup_workflow_states_list', 'setup_workflow_states_add'], [setup_workflow_states_add_link], menu_name=u'sidebar')

 bind_links([State], [setup_state_edit_link, setup_state_delete_link])
 bind_links([State, 'setup_state_list', 'setup_state_create'], [setup_state_create_link], menu_name=u'secondary_menu')

-bind_links([Transition], [setup_transition_edit_link, setup_transition_delete_link])
-bind_links([Transition, 'setup_transition_list', 'setup_transition_create'], [setup_transition_create_link], menu_name=u'secondary_menu')
+#bind_links([Transition], [setup_transition_edit_link, setup_transition_delete_link])
+#bind_links([Transition, 'setup_transition_list', 'setup_transition_create'], [setup_transition_create_link], menu_name=u'secondary_menu')

-bind_links([WorkflowState], [setup_workflow_state_transitions_list_link, setup_workflow_states_edit_link, setup_workflow_states_remove_link])
-bind_links([WorkflowState], [setup_workflow_state_transition_add_link], menu_name=u'sidebar')
+#bind_links([WorkflowState], [setup_workflow_state_transitions_list_link, setup_workflow_states_edit_link, setup_workflow_states_remove_link])
+bind_links([WorkflowState], [setup_workflow_states_edit_link, setup_workflow_states_remove_link])

-bind_links([WorkflowStateTransition], [setup_workflow_state_transition_edit_link])#, setup_transition_delete_link])
+#bind_links([WorkflowState], [setup_workflow_state_transition_add_link], menu_name=u'sidebar')
+#bind_links([WorkflowNode], [setup_workflow_state_transition_add_link], menu_name=u'sidebar')
+
+bind_links([WorkflowNode], [setup_workflow_node_edit_link])#, setup_transition_delete_link])

 register_setup(Link(text=_(u'workflows'), view='setup_workflow_list', icon='chart_organisation.png', permissions=[PERMISSION_WORKFLOW_SETUP_VIEW]))
--- a/apps/workflows/forms.py
+++ b/apps/workflows/forms.py
@@ -3,11 +3,26 @@ from __future__ import absolute_import
 from django import forms
 from django.utils.translation import ugettext_lazy as _

-from .models import Workflow, State, Transition, WorkflowState, WorkflowStateTransition
+from .models import Workflow, State, WorkflowState, WorkflowNode


+class NodeForm(forms.Form):
+    def __init__(self, *args, **kwargs):
+        #workflow = kwargs.pop('workflow')
+        super(WorkflowStateSetupForm, self).__init__(*args, **kwargs)
+        #self.fields['workflow'].initial = workflow
+        #self.fields['workflow'].widget = forms.widgets.HiddenInput()
+        print self.instance
+
+    #def choices(self, workflow):
+    #    return {
+    ##        'next_node': workflow.nodes.all()
+    #    }    
+    
+
 class WorkflowSetupForm(forms.ModelForm):
    class Meta:
+        exclude = ('initial_node,')
        model = Workflow


@@ -27,19 +42,29 @@ class WorkflowStateSetupForm(forms.ModelForm):
        model = WorkflowState


-class TransitionSetupForm(forms.ModelForm):
-    class Meta:
-        model = Transition
-        
-
-class WorkflowStateTransitionSetupForm(forms.ModelForm):
+class WorkflowNodeSetupForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
-        workflow_state = kwargs.pop('workflow_state')
-        super(WorkflowStateTransitionSetupForm, self).__init__(*args, **kwargs)
-        self.fields['workflow_state_source'].initial = workflow_state
-        self.fields['workflow_state_source'].widget = forms.widgets.HiddenInput()
+        workflow = kwargs.pop('workflow')
+        super(WorkflowNodeSetupForm, self).__init__(*args, **kwargs)
+        self.fields['workflow'].initial = workflow
+        self.fields['workflow'].widget = forms.widgets.HiddenInput()
    
    class Meta:
-        model = WorkflowStateTransition
+        model = WorkflowNode
+
+#class TransitionSetupForm(forms.ModelForm):
+#    class Meta:
+#        model = Transition
+        
+
+#class WorkflowStateTransitionSetupForm(forms.ModelForm):
+#    def __init__(self, *args, **kwargs):
+#        workflow_state = kwargs.pop('workflow_state')
+#        super(WorkflowStateTransitionSetupForm, self).__init__(*args, **kwargs)
+#        self.fields['workflow_state_source'].initial = workflow_state
+#        self.fields['workflow_state_source'].widget = forms.widgets.HiddenInput()
+#    
+#    class Meta:
+#        model = WorkflowStateTransition
        
        
--- a/apps/workflows/literals.py
+++ b/apps/workflows/literals.py
@@ -7,3 +7,13 @@ OPERAND_CHOICES = (
    (OPERAND_OR, _(u'or')),
    (OPERAND_AND, _(u'and'))
 )
+
+NODE_TYPE_TASK = 'task'
+NODE_TYPE_START = 'start'
+NODE_TYPE_END = 'end'
+
+NODE_TYPE_CHOICES = (
+    (NODE_TYPE_TASK, _(u'Simple task')),
+    (NODE_TYPE_START, _(u'Start')),
+    (NODE_TYPE_END, _(u'End')),
+)
--- a/apps/workflows/migrations/0002_auto__del_workflowstateabilitygrant__del_workflowstatetransition__del_.py
+++ b/apps/workflows/migrations/0002_auto__del_workflowstateabilitygrant__del_workflowstatetransition__del_.py
@@ -0,0 +1,231 @@
+# encoding: utf-8
+import datetime
+from south.db import db
+from south.v2 import SchemaMigration
+from django.db import models
+
+class Migration(SchemaMigration):
+
+    def forwards(self, orm):
+        
+        # Removing unique constraint on 'WorkflowInstance', fields ['object_id', 'content_type', 'workflow']
+        db.delete_unique('workflows_workflowinstance', ['object_id', 'content_type_id', 'workflow_id'])
+
+        # Deleting model 'WorkflowStateAbilityGrant'
+        db.delete_table('workflows_workflowstateabilitygrant')
+
+        # Deleting model 'WorkflowStateTransition'
+        db.delete_table('workflows_workflowstatetransition')
+
+        # Deleting model 'WorkflowStateTransitionAbility'
+        db.delete_table('workflows_workflowstatetransitionability')
+
+        # Deleting model 'Transition'
+        db.delete_table('workflows_transition')
+
+        # Adding model 'WorkflowInstanceActiveState'
+        db.create_table('workflows_workflowinstanceactivestate', (
+            ('id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
+            ('workflow_instance', self.gf('django.db.models.fields.related.ForeignKey')(to=orm['workflows.WorkflowInstance'])),
+            ('state', self.gf('django.db.models.fields.related.ForeignKey')(to=orm['workflows.State'], null=True)),
+        ))
+        db.send_create_signal('workflows', ['WorkflowInstanceActiveState'])
+
+        # Adding unique constraint on 'WorkflowInstanceActiveState', fields ['workflow_instance', 'state']
+        db.create_unique('workflows_workflowinstanceactivestate', ['workflow_instance_id', 'state_id'])
+
+        # Adding model 'End'
+        db.create_table('workflows_end', (
+            ('id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
+            ('label', self.gf('django.db.models.fields.CharField')(max_length=128)),
+            ('description', self.gf('django.db.models.fields.TextField')(blank=True)),
+        ))
+        db.send_create_signal('workflows', ['End'])
+
+        # Adding model 'WorkflowInstanceActiveNode'
+        db.create_table('workflows_workflowinstanceactivenode', (
+            ('id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
+            ('workflow_instance', self.gf('django.db.models.fields.related.ForeignKey')(to=orm['workflows.WorkflowInstance'])),
+            ('workflow_node', self.gf('django.db.models.fields.related.ForeignKey')(to=orm['workflows.WorkflowNode'])),
+        ))
+        db.send_create_signal('workflows', ['WorkflowInstanceActiveNode'])
+
+        # Adding model 'Start'
+        db.create_table('workflows_start', (
+            ('id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
+            ('label', self.gf('django.db.models.fields.CharField')(max_length=128)),
+            ('description', self.gf('django.db.models.fields.TextField')(blank=True)),
+            ('content_type', self.gf('django.db.models.fields.related.ForeignKey')(to=orm['contenttypes.ContentType'], null=True)),
+            ('object_id', self.gf('django.db.models.fields.PositiveIntegerField')(null=True)),
+        ))
+        db.send_create_signal('workflows', ['Start'])
+
+        # Adding model 'WorkflowNode'
+        db.create_table('workflows_workflownode', (
+            ('id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
+            ('workflow', self.gf('django.db.models.fields.related.ForeignKey')(to=orm['workflows.Workflow'])),
+            ('content_type', self.gf('django.db.models.fields.related.ForeignKey')(to=orm['contenttypes.ContentType'])),
+            ('object_id', self.gf('django.db.models.fields.PositiveIntegerField')()),
+            ('description', self.gf('django.db.models.fields.TextField')(blank=True)),
+        ))
+        db.send_create_signal('workflows', ['WorkflowNode'])
+
+        # Adding field 'Workflow.initial_node'
+        db.add_column('workflows_workflow', 'initial_node', self.gf('django.db.models.fields.related.ForeignKey')(blank=True, related_name='workflow_initial_node', null=True, to=orm['workflows.WorkflowNode']), keep_default=False)
+
+        # Deleting field 'WorkflowInstance.workflow_state'
+        db.delete_column('workflows_workflowinstance', 'workflow_state_id')
+
+        # Adding unique constraint on 'WorkflowState', fields ['state', 'workflow']
+        db.create_unique('workflows_workflowstate', ['state_id', 'workflow_id'])
+
+
+    def backwards(self, orm):
+        
+        # Removing unique constraint on 'WorkflowState', fields ['state', 'workflow']
+        db.delete_unique('workflows_workflowstate', ['state_id', 'workflow_id'])
+
+        # Removing unique constraint on 'WorkflowInstanceActiveState', fields ['workflow_instance', 'state']
+        db.delete_unique('workflows_workflowinstanceactivestate', ['workflow_instance_id', 'state_id'])
+
+        # Adding model 'WorkflowStateAbilityGrant'
+        db.create_table('workflows_workflowstateabilitygrant', (
+            ('workflow_state', self.gf('django.db.models.fields.related.ForeignKey')(related_name='workflow_state_ability', to=orm['workflows.WorkflowState'])),
+            ('id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
+            ('content_type', self.gf('django.db.models.fields.related.ForeignKey')(related_name='workflow_state_ability_object', to=orm['contenttypes.ContentType'])),
+            ('object_id', self.gf('django.db.models.fields.PositiveIntegerField')()),
+        ))
+        db.send_create_signal('workflows', ['WorkflowStateAbilityGrant'])
+
+        # Adding model 'WorkflowStateTransition'
+        db.create_table('workflows_workflowstatetransition', (
+            ('description', self.gf('django.db.models.fields.TextField')(blank=True)),
+            ('workflow_state_source', self.gf('django.db.models.fields.related.ForeignKey')(related_name='workflow_state_transition_source', to=orm['workflows.WorkflowState'])),
+            ('transition', self.gf('django.db.models.fields.related.ForeignKey')(related_name='workflow_state_transition', to=orm['workflows.Transition'])),
+            ('workflow_state_destination', self.gf('django.db.models.fields.related.ForeignKey')(related_name='workflow_state_transition_destination', to=orm['workflows.WorkflowState'])),
+            ('id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
+        ))
+        db.send_create_signal('workflows', ['WorkflowStateTransition'])
+
+        # Adding model 'WorkflowStateTransitionAbility'
+        db.create_table('workflows_workflowstatetransitionability', (
+            ('ability', self.gf('django.db.models.fields.related.ForeignKey')(related_name='workflow_state_transition_ability', to=orm['workflows.Ability'])),
+            ('attribute_comparison_operand', self.gf('django.db.models.fields.CharField')(default='and', max_length=8)),
+            ('negate', self.gf('django.db.models.fields.BooleanField')(default=False)),
+            ('id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
+            ('description', self.gf('django.db.models.fields.TextField')(blank=True)),
+        ))
+        db.send_create_signal('workflows', ['WorkflowStateTransitionAbility'])
+
+        # Adding model 'Transition'
+        db.create_table('workflows_transition', (
+            ('label', self.gf('django.db.models.fields.CharField')(max_length=128)),
+            ('description', self.gf('django.db.models.fields.TextField')(blank=True)),
+            ('id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
+        ))
+        db.send_create_signal('workflows', ['Transition'])
+
+        # Deleting model 'WorkflowInstanceActiveState'
+        db.delete_table('workflows_workflowinstanceactivestate')
+
+        # Deleting model 'End'
+        db.delete_table('workflows_end')
+
+        # Deleting model 'WorkflowInstanceActiveNode'
+        db.delete_table('workflows_workflowinstanceactivenode')
+
+        # Deleting model 'Start'
+        db.delete_table('workflows_start')
+
+        # Deleting model 'WorkflowNode'
+        db.delete_table('workflows_workflownode')
+
+        # Deleting field 'Workflow.initial_node'
+        db.delete_column('workflows_workflow', 'initial_node_id')
+
+        # User chose to not deal with backwards NULL issues for 'WorkflowInstance.workflow_state'
+        raise RuntimeError("Cannot reverse this migration. 'WorkflowInstance.workflow_state' and its values cannot be restored.")
+
+        # Adding unique constraint on 'WorkflowInstance', fields ['object_id', 'content_type', 'workflow']
+        db.create_unique('workflows_workflowinstance', ['object_id', 'content_type_id', 'workflow_id'])
+
+
+    models = {
+        'contenttypes.contenttype': {
+            'Meta': {'ordering': "('name',)", 'unique_together': "(('app_label', 'model'),)", 'object_name': 'ContentType', 'db_table': "'django_content_type'"},
+            'app_label': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'model': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '100'})
+        },
+        'workflows.ability': {
+            'Meta': {'object_name': 'Ability'},
+            'description': ('django.db.models.fields.TextField', [], {'blank': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'label': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '128'})
+        },
+        'workflows.end': {
+            'Meta': {'object_name': 'End'},
+            'description': ('django.db.models.fields.TextField', [], {'blank': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'label': ('django.db.models.fields.CharField', [], {'max_length': '128'})
+        },
+        'workflows.start': {
+            'Meta': {'object_name': 'Start'},
+            'content_type': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['contenttypes.ContentType']", 'null': 'True'}),
+            'description': ('django.db.models.fields.TextField', [], {'blank': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'label': ('django.db.models.fields.CharField', [], {'max_length': '128'}),
+            'object_id': ('django.db.models.fields.PositiveIntegerField', [], {'null': 'True'})
+        },
+        'workflows.state': {
+            'Meta': {'object_name': 'State'},
+            'description': ('django.db.models.fields.TextField', [], {'blank': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'label': ('django.db.models.fields.CharField', [], {'max_length': '128'})
+        },
+        'workflows.workflow': {
+            'Meta': {'object_name': 'Workflow'},
+            'description': ('django.db.models.fields.TextField', [], {'blank': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'initial_node': ('django.db.models.fields.related.ForeignKey', [], {'blank': 'True', 'related_name': "'workflow_initial_node'", 'null': 'True', 'to': "orm['workflows.WorkflowNode']"}),
+            'initial_state': ('django.db.models.fields.related.ForeignKey', [], {'blank': 'True', 'related_name': "'workflow_initial_state'", 'null': 'True', 'to': "orm['workflows.WorkflowState']"}),
+            'label': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '128'})
+        },
+        'workflows.workflowinstance': {
+            'Meta': {'object_name': 'WorkflowInstance'},
+            'content_type': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'workflow_instance_object'", 'to': "orm['contenttypes.ContentType']"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'object_id': ('django.db.models.fields.PositiveIntegerField', [], {}),
+            'workflow': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['workflows.Workflow']"})
+        },
+        'workflows.workflowinstanceactivenode': {
+            'Meta': {'object_name': 'WorkflowInstanceActiveNode'},
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'workflow_instance': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['workflows.WorkflowInstance']"}),
+            'workflow_node': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['workflows.WorkflowNode']"})
+        },
+        'workflows.workflowinstanceactivestate': {
+            'Meta': {'unique_together': "(('workflow_instance', 'state'),)", 'object_name': 'WorkflowInstanceActiveState'},
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'state': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['workflows.State']", 'null': 'True'}),
+            'workflow_instance': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['workflows.WorkflowInstance']"})
+        },
+        'workflows.workflownode': {
+            'Meta': {'object_name': 'WorkflowNode'},
+            'content_type': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['contenttypes.ContentType']"}),
+            'description': ('django.db.models.fields.TextField', [], {'blank': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'object_id': ('django.db.models.fields.PositiveIntegerField', [], {}),
+            'workflow': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['workflows.Workflow']"})
+        },
+        'workflows.workflowstate': {
+            'Meta': {'unique_together': "(('workflow', 'state'),)", 'object_name': 'WorkflowState'},
+            'description': ('django.db.models.fields.TextField', [], {'blank': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'state': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['workflows.State']"}),
+            'workflow': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['workflows.Workflow']"})
+        }
+    }
+
+    complete_apps = ['workflows']
--- a/apps/workflows/models.py
+++ b/apps/workflows/models.py
@@ -4,11 +4,14 @@ from django.db import models
 from django.contrib.contenttypes import generic
 from django.contrib.contenttypes.models import ContentType
 from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import ugettext

 from permissions.models import StoredPermission

 from .literals import OPERAND_CHOICES, OPERAND_AND
+#from .literals import NODE_TYPE_TASK, NODE_TYPE_START, NODE_TYPE_END

+#NODE_TYPE_CHOICES

 class Ability(models.Model):
    label = models.CharField(max_length=128, unique=True, verbose_name = _(u'label'))
@@ -24,44 +27,149 @@ class Ability(models.Model):

 class Workflow(models.Model):
    label = models.CharField(max_length=128, unique=True, verbose_name = _(u'label'))
+    initial_node = models.ForeignKey('WorkflowNode', related_name='workflow_initial_node', blank=True, null=True, verbose_name=_(u'initial node'))
    initial_state = models.ForeignKey('WorkflowState', related_name='workflow_initial_state', blank=True, null=True, verbose_name=_(u'initial state'))
    description = models.TextField(blank=True, verbose_name=_(u'description'))
    
    def __unicode__(self):
        return self.label
 
+    @property
+    def workflow_nodes(self):
+        return self.workflownode_set
+ 
+    def get_nodes(self):
+        return [workflow_node.node for workflow_node in self.workflownode_set.all()]
+        
+    def add_node(self, node):
+        workflow_node = WorkflowNode(
+            workflow=self,
+            node=node)
+        workflow_node.save()
+        return workflow_node
+ 
+    def save(self, *args, **kwargs):
+        is_new = not self.pk
+        result = super(Workflow, self).save(*args, **kwargs)
+
+        if is_new:
+            # Instanciate a new start node
+            start_node = Start()
+            start_node.save()
+            
+            # Set the start node a
+            workflow_node = self.add_node(node=start_node)
+            
+            self.initial_node = workflow_node
+            self.save()
+            
+        return result
+ 
    class Meta:
        verbose_name = _(u'workflow')
        verbose_name_plural = _(u'workflows')
-        
-        
-class State(models.Model):
+
+
+class Node(models.Model):
+    """
+    Must provide:
+        possible_next_nodes()
+            Arguments: None
+            Returns:
+                List of possible nodes after this one executes
+            
+        choices()
+            Arguments: workflow
+            Returns:
+                {
+                    'next_node': workflow.nodes.all()
+                }
+
+        execute()
+            Arguments: workflow_instance
+            Returns: next_node    
+    """
+    
    label = models.CharField(max_length=128, verbose_name=_(u'label'))
    description = models.TextField(blank=True, verbose_name=_(u'description'))

    def __unicode__(self):
-        #return '%s (%s)' % (self.name, self.workflow.name)
        return self.label

    class Meta:
        verbose_name = _(u'state')
        verbose_name_plural = _(u'states')
+        abstract = True
+
+
+class Start(Node):
+    """
+    The node with which all workflows start
+    """
+    content_type = models.ForeignKey(ContentType, null=True)
+    object_id = models.PositiveIntegerField(null=True)
+    next_node = generic.GenericForeignKey(ct_field='content_type', fk_field='object_id')
+    
+    def __unicode__(self):
+        return ugettext(u'Start')
+        
+    def possible_next_nodes(self):
+        return self.next_node
+            
+    def choices(self, workflow):
+        return {
+            'next_node': workflow.nodes.all()
+        }
+
+    def execute(self, workflow_instance):
+        return self.next_node
+
+    class Meta(Node.Meta):
+        verbose_name = _(u'start')
+        verbose_name_plural = _(u'starts')
        

-class Transition(models.Model):
+class End(Node):
+    class Meta(Node.Meta):
+        verbose_name = _(u'start')
+        verbose_name_plural = _(u'starts')
+    
+
+'''
+class Sequence(Node):
+    """
+    A node that is enabled after the completion of a preceding node in the same workflow
+    """
+    content_type = models.ForeignKey(ContentType)
+    object_id = models.PositiveIntegerField()
+    next_node = generic.GenericForeignKey(ct_field='content_type', fk_field='object_id')
+    #node_type = NODE_TYPE_TASK
+
+    def execute(self):
+        return self.next_node
+    
+    class Meta(Node.Meta):
+        verbose_name = _(u'task')
+        verbose_name_plural = _(u'tasks')
+'''
+
+class State(models.Model):
    label = models.CharField(max_length=128, verbose_name=_(u'label'))
    description = models.TextField(blank=True, verbose_name=_(u'description'))

    def __unicode__(self):
-        #return '%s (%s)' % (self.name, self.workflow.name)
        return self.label

    class Meta:
-        verbose_name = _(u'transition')
-        verbose_name_plural = _(u'transitions')
-    
-    
+        verbose_name = _(u'state')
+        verbose_name_plural = _(u'states')
+        ordering = ('label',)
+        
+
 class WorkflowState(models.Model):
+    """
+    List of possible states the object of this worflow could be in
+    """
    workflow = models.ForeignKey(Workflow, verbose_name=_(u'workflow'))
    state = models.ForeignKey(State, verbose_name=_(u'state'))
    description = models.TextField(blank=True, verbose_name=_(u'description'))
@@ -69,17 +177,33 @@ class WorkflowState(models.Model):
    def __unicode__(self):
        return unicode(self.state)

-    @property
-    def transitions(self):
-        return self.workflowstatetransition_set
-
    class Meta:
-        #unique_together = ('workflow', 'state')
+        unique_together = ('workflow', 'state')
        verbose_name = _(u'workflow state')
        verbose_name_plural = _(u'workflows states')

+# TODO: Reduntant - remove
+class WorkflowNode(models.Model):
+    workflow = models.ForeignKey(Workflow, verbose_name=_(u'workflow'))
+    content_type = models.ForeignKey(ContentType)#, limit_choices_to={'model__in': ('model1', 'model2')})#, related_name='workflow_state_ability_object')#, blank=True, null=True)
+    object_id = models.PositiveIntegerField()#blank=True, null=True)
+    node = generic.GenericForeignKey(ct_field='content_type', fk_field='object_id')
+    description = models.TextField(blank=True, verbose_name=_(u'description'))
+        
+    def __unicode__(self):
+        return unicode(self.node)

-class WorkflowStateAbilityGrant(models.Model):
+    #def save(self, *args, **kwargs):
+    #    if not issubclass(
+    #    return super(WorkflowNode, self).save(*args, **kwargs)
+        
+    class Meta:
+        #unique_together = ('workflow', 'state')
+        verbose_name = _(u'workflow node')
+        verbose_name_plural = _(u'workflows nodes')
+
+"""
+class WorkflowTaskAbilityGrant(models.Model):
    workflow_state = models.ForeignKey(WorkflowState, related_name='workflow_state_ability', verbose_name=_(u'workflow state'))
    content_type = models.ForeignKey(ContentType, related_name='workflow_state_ability_object')#, blank=True, null=True)
    object_id = models.PositiveIntegerField()#blank=True, null=True)
@@ -133,16 +257,69 @@ class WorkflowStateTransitionAbility(models.Model):
        verbose_name = _(u'transition')
        verbose_name_plural = _(u'transitions')
      
-        
+"""        
 class WorkflowInstance(models.Model):
-    workflow = models.ForeignKey(Workflow, verbose_name = _(u'workflow'))
+    workflow = models.ForeignKey(Workflow, verbose_name=_(u'workflow'))
    content_type = models.ForeignKey(ContentType, verbose_name=_(u'Content type'), related_name='workflow_instance_object')#, blank=True, null=True)
    object_id = models.PositiveIntegerField()#blank=True, null=True)
    content_object = generic.GenericForeignKey(ct_field='content_type', fk_field='object_id')
-    workflow_state = models.ForeignKey(WorkflowState, related_name='workflow_instance_state', verbose_name=_(u'state'))

    def __unicode__(self):
        return unicode(self.content_object)
+     
+    @property
+    def active_nodes(self):
+        return self.workflowinstanceactivenode_set
+        
+    def set_active_state(self, state):
+        active_state = self.get_active_state()
+        if active_state:
+            active_state.delete()
+            
+        # Trigger an exception if the state argument if not allowed for this workflow
+        state = WorkflowState.objects.get(workflow=self.workflow, state=state).state
+
+        self.workflowinstanceactivestate_set.create(
+            workflow_instance = self,
+            state = state
+        )
+
+    def get_active_state(self):
+        try:
+            return self.workflowinstanceactivestate_set.get().state
+        except WorkflowInstanceActiveState.DoesNotExist:
+            return None
+            
+    active_state = property(get_active_state, set_active_state)
    
    class Meta:
-        unique_together = ('content_type', 'object_id', 'workflow')
+        verbose_name = _(u'workflow instance')
+        verbose_name_plural = _(u'workflow instances')
+        
+    #    unique_together = ('content_type', 'object_id', 'workflow')
+
+
+class WorkflowInstanceActiveNode(models.Model):
+    workflow_instance = models.ForeignKey(WorkflowInstance, verbose_name=_(u'workflow instance'))
+    workflow_node = models.ForeignKey(WorkflowNode, verbose_name=_(u'workflow node'))    
+
+    class Meta:
+        verbose_name = _(u'workflow instance active node')
+        verbose_name_plural = _(u'workflow instances active nodes')
+
+
+class WorkflowInstanceActiveState(models.Model):
+    """
+    This class holds the active state for the workflow instance
+    """
+    workflow_instance = models.ForeignKey(WorkflowInstance, verbose_name=_(u'workflow instance'))
+    state = models.ForeignKey(State, null=True, verbose_name=_(u'state'))    
+
+    class Meta:
+        unique_together = ('workflow_instance', 'state')
+        verbose_name = _(u'workflow instance active state')
+        verbose_name_plural = _(u'workflow instances active states')
+
+
+# TODO: WorkflowInstanceActiveNodeHistory
+# TODO: WorkflowInstanceActiveStateHistory
--- a/apps/workflows/permissions.py
+++ b/apps/workflows/permissions.py
@@ -16,8 +16,8 @@ PERMISSION_STATE_SETUP_CREATE = Permission.objects.register(namespace, 'state_se
 PERMISSION_STATE_SETUP_EDIT = Permission.objects.register(namespace, 'state_setup_edit', _(u'Edit existing state templates'))
 PERMISSION_STATE_SETUP_DELETE = Permission.objects.register(namespace, 'state_setup_delete', _(u'Delete existing state templates'))

-PERMISSION_TRANSITION_SETUP_VIEW = Permission.objects.register(namespace, 'transition_setup_view', _(u'View existing transition templates'))
-PERMISSION_TRANSITION_SETUP_CREATE = Permission.objects.register(namespace, 'transition_setup_create', _(u'Create new transition templates'))
-PERMISSION_TRANSITION_SETUP_EDIT = Permission.objects.register(namespace, 'transition_setup_edit', _(u'Edit existing transition templates'))
-PERMISSION_TRANSITION_SETUP_DELETE = Permission.objects.register(namespace, 'transition_setup_delete', _(u'Delete existing transition templates'))
+#PERMISSION_TRANSITION_SETUP_VIEW = Permission.objects.register(namespace, 'transition_setup_view', _(u'View existing transition templates'))
+#PERMISSION_TRANSITION_SETUP_CREATE = Permission.objects.register(namespace, 'transition_setup_create', _(u'Create new transition templates'))
+#PERMISSION_TRANSITION_SETUP_EDIT = Permission.objects.register(namespace, 'transition_setup_edit', _(u'Edit existing transition templates'))
+#PERMISSION_TRANSITION_SETUP_DELETE = Permission.objects.register(namespace, 'transition_setup_delete', _(u'Delete existing transition templates'))

--- a/apps/workflows/urls.py
+++ b/apps/workflows/urls.py
@@ -11,17 +11,11 @@ urlpatterns = patterns('workflows.views',
    url(r'^setup/workflow/state/(?P<workflow_state_pk>\d+)/edit/$', 'setup_workflow_state_edit', (), 'setup_workflow_state_edit'),
    url(r'^setup/workflow/state/(?P<workflow_state_pk>\d+)/remove/$', 'setup_workflow_state_remove', (), 'setup_workflow_state_remove'),

-    url(r'^setup/workflow/state/(?P<workflow_state_pk>\d+)/transition/list/$', 'setup_workflow_state_transitions_list', (), 'setup_workflow_state_transitions_list'),
-    url(r'^setup/workflow/state/(?P<workflow_state_pk>\d+)/transition/add/$', 'setup_workflow_state_transition_add', (), 'setup_workflow_state_transition_add'),
-    url(r'^setup/workflow/state/transition/(?P<workflow_state_transition_pk>\d+)/edit/$', 'setup_workflow_state_transition_edit', (), 'setup_workflow_state_transition_edit'),
-
    url(r'^setup/state/list/$', 'setup_state_list', (), 'setup_state_list'),
    url(r'^setup/state/create/$', 'setup_state_create', (), 'setup_state_create'),
    url(r'^setup/state/(?P<state_pk>\d+)/edit/$', 'setup_state_edit', (), 'setup_state_edit'),
    url(r'^setup/state/(?P<state_pk>\d+)/delete/$', 'setup_state_delete', (), 'setup_state_delete'),
-    
-    url(r'^setup/transition/list/$', 'setup_transition_list', (), 'setup_transition_list'),
-    url(r'^setup/transition/create/$', 'setup_transition_create', (), 'setup_transition_create'),
-    url(r'^setup/transition/(?P<transition_pk>\d+)/edit/$', 'setup_transition_edit', (), 'setup_transition_edit'),
-    url(r'^setup/transition/(?P<transition_pk>\d+)/delete/$', 'setup_transition_delete', (), 'setup_transition_delete'),
+
+    url(r'^setup/workflow/(?P<workflow_pk>\d+)/node/list/$', 'setup_workflow_node_list', (), 'setup_workflow_node_list'),
+    url(r'^setup/workflow/node/(?P<workflow_node_pk>\d+)/edit/$', 'setup_workflow_node_edit', (), 'setup_workflow_node_edit'),
 )
--- a/apps/workflows/views.py
+++ b/apps/workflows/views.py
@@ -18,18 +18,14 @@ from common.utils import encapsulate
 #from common.widgets import two_state_template
 #from acls.models import AccessEntry

-from .models import Workflow, State, Transition, WorkflowState
+from .models import Workflow, State, WorkflowState, WorkflowNode
 from .forms import (WorkflowSetupForm, StateSetupForm, 
-    WorkflowStateSetupForm, TransitionSetupForm,
-    WorkflowStateTransitionSetupForm)
+    WorkflowStateSetupForm, WorkflowNodeSetupForm)
 from .permissions import (PERMISSION_WORKFLOW_SETUP_VIEW,
    PERMISSION_WORKFLOW_SETUP_CREATE, PERMISSION_WORKFLOW_SETUP_EDIT,
    PERMISSION_WORKFLOW_SETUP_DELETE, PERMISSION_STATE_SETUP_VIEW,
    PERMISSION_STATE_SETUP_CREATE, PERMISSION_STATE_SETUP_EDIT,
-    PERMISSION_STATE_SETUP_DELETE, PERMISSION_TRANSITION_SETUP_VIEW,
-    PERMISSION_TRANSITION_SETUP_CREATE, PERMISSION_TRANSITION_SETUP_EDIT,
-    PERMISSION_TRANSITION_SETUP_DELETE)
-
+    PERMISSION_STATE_SETUP_DELETE)

 logger = logging.getLogger(__name__)

@@ -207,7 +203,7 @@ def setup_workflow_state_edit(request, workflow_state_pk):
        form = WorkflowStateSetupForm(workflow=workflow_state.workflow, instance=workflow_state)

    return render_to_response('generic_form.html', {
-        'title': _(u'edit worflow state'),
+        'title': _(u'edit worflow state: %s') % workflow_state,
        'form': form,
        'workflow': workflow_state.workflow,
        'workflow_state': workflow_state,
@@ -272,6 +268,54 @@ def setup_workflow_state_remove(request, workflow_state_pk=None, workflow_state_
        context_instance=RequestContext(request))    


+# Nodes
+def setup_workflow_node_list(request, workflow_pk):
+    Permission.objects.check_permissions(request.user, [PERMISSION_WORKFLOW_SETUP_EDIT])
+    workflow = get_object_or_404(Workflow, pk=workflow_pk)
+
+    context = {
+        'object_list': workflow.workflow_nodes.all(),
+        'extra_columns': [
+            {'name': _(u'Posible next nodes'), 'attribute': encapsulate(lambda workflow_node: workflow_node.node.possible_next_nodes() or _(u'None'))},
+        ],        
+        'title': _(u'nodes of workflow: %s') % workflow,
+        'hide_link': True,
+        'workflow': workflow,
+        'navigation_object_list': [
+            {'object': 'workflow', 'name': _(u'workflow')},
+        ],
+        'list_object_variable_name': 'workflow_node',
+    }
+
+    return render_to_response('generic_list.html', context,
+        context_instance=RequestContext(request))
+
+
+def setup_workflow_node_edit(request, workflow_node_pk):
+    Permission.objects.check_permissions(request.user, [PERMISSION_WORKFLOW_SETUP_EDIT])
+    workflow_node = get_object_or_404(WorkflowNode, pk=workflow_node_pk)
+    redirect_url = reverse('setup_workflow_node_list', args=[workflow_node.workflow.pk])
+
+    if request.method == 'POST':
+        form = WorkflowNodeSetupForm(workflow=workflow_node.workflow, instance=workflow_node, data=request.POST)
+        if form.is_valid():
+            state = form.save()
+            messages.success(request, _(u'worflow node edited succesfully.'))
+            return HttpResponseRedirect(redirect_url)
+    else:
+        form = WorkflowNodeSetupForm(workflow=workflow_node.workflow, instance=workflow_node)
+
+    return render_to_response('generic_form.html', {
+        'title': _(u'edit worflow node: %s') % workflow_node,
+        'form': form,
+        'workflow': workflow_node.workflow,
+        'workflow_node': workflow_node,
+        'navigation_object_list': [
+            {'object': 'workflow', 'name': _(u'workflow')},
+            {'object': 'workflow_node', 'name': _(u'workflow node')}
+        ],
+    }, context_instance=RequestContext(request))
+"""
 def setup_workflow_transition_list(request, state_workflow_pk):
    Permission.objects.check_permissions(request.user, [PERMISSION_WORKFLOW_SETUP_EDIT])
    workflow = get_object_or_404(Workflow, pk=workflow_pk)
@@ -289,6 +333,7 @@ def setup_workflow_transition_list(request, state_workflow_pk):

    return render_to_response('generic_list.html', context,
        context_instance=RequestContext(request))
+"""
 # States
 def setup_state_list(request):
    Permission.objects.check_permissions(request.user, [PERMISSION_STATE_SETUP_VIEW])
@@ -395,7 +440,7 @@ def setup_state_delete(request, state_pk=None, state_pk_list=None):
    return render_to_response('generic_confirm.html', context,
        context_instance=RequestContext(request))

-
+"""
 # Transitions
 def setup_transition_list(request):
    Permission.objects.check_permissions(request.user, [PERMISSION_TRANSITION_SETUP_VIEW])
@@ -507,8 +552,8 @@ def setup_transition_delete(request, transition_pk=None, transition_pk_list=None

    return render_to_response('generic_confirm.html', context,
        context_instance=RequestContext(request))
-
-
+"""
+"""
 # State transitions
 def setup_workflow_state_transitions_list(request, workflow_state_pk):
    Permission.objects.check_permissions(request.user, [PERMISSION_WORKFLOW_SETUP_EDIT])
@@ -587,7 +632,7 @@ def setup_workflow_state_transition_edit(request, work_state_transition_pk):
        ],
        'list_object_variable_name': 'workflow_state_transition',
    }, context_instance=RequestContext(request))
-    
+"""    
 """
 def setup_state_transition_remove(request, state_transition_pk=None, state_transition_pk_list=None):
    post_action_redirect = None