Added filters as part of wtf accepted field parameters.

Also added basic validation method in WtfBaseField to ensure
the both submitted 'validators' and 'filters' are list values or
callables.

Author: losintikfos

flask_mongoengine/wtf/base.py

@@ -10,17 +10,32 @@ class WtfBaseField(BaseField):
     number of field parameters, and settings on behalf
     of document model form generator for WTForm.
 
+    @param validators:  wtf model form field validators.
+    @param filters:     wtf model form field filters.
     """
 
-    def __init__(self, validators=None, **kwargs):
+    def __init__(self, validators=None, filters=None, **kwargs):
+
+        self.validators =\
+            self._ensure_callable_or_list(validators, 'validators')
+        self.filters = self._ensure_callable_or_list(filters, 'filters')
+
         BaseField.__init__(self, **kwargs)
 
-        # Ensure we have a list of validators
-        if validators is not None:
-            if callable(validators):
-                validators = [validators]
+
+    def _ensure_callable_or_list(self, field, msg_flag):
+        """
+        Ensure the value submitted via field is either
+        a callable object to convert to list or it is
+        in fact a valid list value.
+
+        """
+        if field is not None:
+            if callable(field):
+                field = [field]
             else:
-                msg = "Argument 'validators' must be a list value"
-                if not isinstance(validators, list):
+                msg = "Argument '%s' must be a list value" % msg_flag
+                if not isinstance(field, list):
                     raise TypeError(msg)
-        self.validators = validators
+
+        return field

flask_mongoengine/wtf/orm.py

@@ -48,7 +48,7 @@ def convert(self, model, field, field_args):
             'label': getattr(field, 'verbose_name', field.name),
             'description': field.help_text or '',
             'validators': [] if not field.validators else field.validators,
-            'filters': [],
+            'filters': [] if not field.filters else field.filters,
             'default': field.default,
         }
         if field_args: