Update forms app

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

mayan/apps/forms/classes.py

@@ -1,28 +1,64 @@
 from __future__ import unicode_literals
 
+from importlib import import_module
 import logging
 
 from django.apps import apps
 from django.utils import six
 from django.utils.encoding import force_text
+from django.utils.module_loading import import_string
 from django.utils.translation import ugettext_lazy as _
 
 logger = logging.getLogger(__name__)
 
 
-class FieldEntry(object):
+class FieldClass(object):
     _registry = {}
 
+    @staticmethod
+    def initialize():
+        for app in apps.get_app_configs():
+            try:
+                import_module('{}.form_fields'.format(app.name))
+            except ImportError as exception:
+                if force_text(exception) not in ('No module named form_fields', 'No module named \'{}.form_fields\''.format(app.name)):
+                    logger.error(
+                        'Error importing %s queues.py file; %s', app.name,
+                        exception
+                    )
+                    raise
+
+        FieldClass.update()
+
     @classmethod
     def all(cls):
         return cls._registry.values()
 
+    @classmethod
+    def update(cls):
+        FieldChoice = apps.get_model(
+            app_label='forms', model_name='FieldChoice'
+        )
+
+        for field in cls.all():
+            FieldChoice.objects.update_or_create(
+                dotted_path=field.dotted_path, defaults={
+                    'label': field.label
+                }
+            )
+
     def __init__(self, dotted_path, label):
         self.dotted_path = dotted_path
         self.label = label
 
         self.__class__._registry[self.dotted_path] = self
 
-
-
-FieldEntry(dotted_path='django.forms.CharField', label='Character field')
+    def validate(self):
+        try:
+            import_string(dotted_path=self.dotted_path)
+        except Exception as exception:
+            logger.critical(
+                'Exception validating field entry %s; %s', self.label, exception,
+                exc_info=True
+            )
+            raise