Cleanup SourceColumn invocations

Update the code of some SourceColumn invocations to be model methods
instead of lambda wapped functions.

Move the translated labels to the models too.

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

mayan/apps/document_states/models.py

@@ -13,6 +13,7 @@ from django.core.exceptions import PermissionDenied, ValidationError
 from django.core.files.base import ContentFile
 from django.db import IntegrityError, models
 from django.db.models import F, Max, Q
+from django.template import Context, Template
 from django.urls import reverse
 from django.utils.encoding import force_text, python_2_unicode_compatible
 from django.utils.module_loading import import_string
@@ -113,6 +114,8 @@ class Workflow(models.Model):
         except self.states.model.DoesNotExist:
             return None
 
+    get_initial_state.short_description = _('Initial state')
+
     def launch_for(self, document):
         try:
             logger.info(
@@ -408,6 +411,10 @@ class WorkflowInstance(models.Model):
             'workflow_instance': self,
         }
 
+    def get_current_completion(self):
+        return self.get_current_state().completion
+    get_current_completion.short_description = _('Completion')
+
     def get_current_state(self):
         """
         Actual State - The current state of the workflow. If there are
@@ -420,6 +427,8 @@ class WorkflowInstance(models.Model):
         except AttributeError:
             return self.workflow.get_initial_state()
 
+    get_current_state.short_description = _('Current state')
+
     def get_last_log_entry(self):
         try:
             return self.log_entries.order_by('datetime').last()
@@ -436,6 +445,28 @@ class WorkflowInstance(models.Model):
         except AttributeError:
             return None
 
+    get_last_transition.short_description = _('Last transition')
+
+    def get_last_transition_datetime(self, formatted=False):
+        entry = self.get_last_log_entry()
+        if not entry:
+            return _('None')
+        else:
+            if formatted:
+                return entry.get_rendered_datetime()
+            else:
+                return entry.datetime
+
+    get_last_transition_datetime.short_description = _('Date and time')
+
+    def get_last_transition_user(self):
+        try:
+            return self.get_last_log_entry().user
+        except AttributeError:
+            return _('None')
+
+    get_last_transition_user.short_description = _('User')
+
     def get_transition_choices(self, _user=None):
         current_state = self.get_current_state()
 
@@ -509,6 +540,13 @@ class WorkflowInstanceLogEntry(models.Model):
         if self.transition not in self.workflow_instance.get_transition_choices(_user=self.user):
             raise ValidationError(_('Not a valid transition choice.'))
 
+    def get_rendered_datetime(self):
+        return Template('{{ instance.datetime }}').render(
+            context=Context({'instance': self})
+        )
+
+    get_rendered_datetime.short_description = _('Date and time')
+
     def save(self, *args, **kwargs):
         result = super(WorkflowInstanceLogEntry, self).save(*args, **kwargs)
         context = self.workflow_instance.get_context()