Add the tag remove workflow state action.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/tags/workflow_actions.py

@@ -7,9 +7,9 @@ from django.utils.translation import ugettext_lazy as _
 from acls.models import AccessControlList
 from document_states.classes import WorkflowAction
 from tags.models import Tag
-from tags.permissions import permission_tag_view
+from tags.permissions import permission_tag_attach, permission_tag_remove
 
-__all__ = ('AttachTagAction',)
+__all__ = ('AttachTagAction', 'RemoveTagAction')
 logger = logging.getLogger(__name__)
 
 
@@ -44,7 +44,7 @@ class AttachTagAction(WorkflowAction):
         logger.debug('user: %s', user)
 
         queryset = AccessControlList.objects.filter_by_access(
-            permission_tag_view, user, queryset=Tag.objects.all()
+            permission_tag_attach, user, queryset=Tag.objects.all()
         )
 
         self.fields[0]['kwargs']['queryset'] = queryset
@@ -60,3 +60,52 @@ class AttachTagAction(WorkflowAction):
             tag.attach_to(
                 document=context['entry_log'].workflow_instance.document
             )
+
+
+class RemoveTagAction(WorkflowAction):
+    fields = (
+        {
+            'name': 'tags', 'label': _('Tags'),
+            'class': 'django.forms.ModelMultipleChoiceField', 'kwargs': {
+                'help_text': _('Tags to remove from the document'),
+                'queryset': Tag.objects.none(), 'required': False
+            }
+        },
+    )
+    label = _('Remove tag')
+    widgets = {
+        'tags': {
+            'class': 'tags.widgets.TagFormWidget', 'kwargs': {
+                'attrs': {'class': 'select2-tags'},
+                'queryset': Tag.objects.none()
+            }
+        }
+    }
+
+    def __init__(self, tags=None):
+        if tags:
+            self.tags = Tag.objects.filter(pk__in=tags)
+        else:
+            self.tags = Tag.objects.none()
+
+    def get_form_schema(self, request):
+        user = request.user
+        logger.debug('user: %s', user)
+
+        queryset = AccessControlList.objects.filter_by_access(
+            permission_tag_remove, user, queryset=Tag.objects.all()
+        )
+
+        self.fields[0]['kwargs']['queryset'] = queryset
+        self.widgets['tags']['kwargs']['queryset'] = queryset
+
+        return {
+            'fields': self.fields,
+            'widgets': self.widgets
+        }
+
+    def execute(self, context):
+        for tag in self.tags:
+            tag.remove_from(
+                document=context['entry_log'].workflow_instance.document
+            )