Make validator not trigger migration creation.

mayan/apps/converter/migrations/0007_auto_20150711_0656.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+import converter.validators
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('converter', '0006_auto_20150708_0120'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='transformation',
+            name='arguments',
+            field=models.TextField(help_text='Enter the arguments for the transformation as a YAML dictionary. ie: {"degrees": 180}', blank=True, verbose_name='Arguments', validators=[converter.validators.YAMLValidator()]),
+            preserve_default=True,
+        ),
+    ]

mayan/apps/converter/models.py

@@ -15,10 +15,6 @@ from .validators import YAMLValidator
 logger = logging.getLogger(__name__)
 
 
-def validators():
-    return [YAMLValidator()]
-
-
 @python_2_unicode_compatible
 class Transformation(models.Model):
     """
@@ -32,7 +28,7 @@ class Transformation(models.Model):
 
     order = models.PositiveIntegerField(blank=True, db_index=True, default=0, help_text=_('Order in which the transformations will be executed.'), null=True, verbose_name=_('Order'))
     name = models.CharField(choices=BaseTransformation.get_transformation_choices(), max_length=128, verbose_name=_('Name'))
-    arguments = models.TextField(blank=True, help_text=_('Enter the arguments for the transformation as a YAML dictionary. ie: {"degrees": 180}'), validators=validators, verbose_name=_('Arguments'))
+    arguments = models.TextField(blank=True, help_text=_('Enter the arguments for the transformation as a YAML dictionary. ie: {"degrees": 180}'), validators=[YAMLValidator()], verbose_name=_('Arguments'))
 
     objects = TransformationManager()
 

mayan/apps/converter/validators.py

@@ -3,8 +3,8 @@ from __future__ import unicode_literals
 import yaml
 
 from django.core.exceptions import ValidationError
-from django.utils.translation import ugettext_lazy as _
 from django.utils.deconstruct import deconstructible
+from django.utils.translation import ugettext_lazy as _
 
 
 @deconstructible
@@ -19,3 +19,11 @@ class YAMLValidator(object):
             yaml.safe_load(value)
         except yaml.error.YAMLError:
             raise ValidationError(_('Enter a valid YAML value.'), code='invalid')
+
+    def __eq__(self, other):
+        return (
+            isinstance(other, YAMLValidator)
+        )
+
+    def __ne__(self, other):
+        return not (self == other)