No number range field

wtforms_alchemy/__init__.py

@@ -9,7 +9,6 @@
 from wtforms_components import (
     DateRange,
     Email,
-    NumberRangeField,
     PhoneNumberField,
     SelectField,
     SelectMultipleField,
@@ -30,7 +29,7 @@
     UnknownTypeException,
     UnknownConfigurationOption
 )
-from .fields import ModelFieldList, ModelFormField
+from .fields import ModelFieldList, ModelFormField, OptionalModelFormField
 from .generator import FormGenerator
 
 
@@ -40,7 +39,7 @@
     InvalidAttributeException,
     ModelFieldList,
     ModelFormField,
-    NumberRangeField,
+    OptionalModelFormField,
     PhoneNumberField,
     SelectField,
     SelectMultipleField,
@@ -207,6 +206,11 @@ class Meta:
             #: List of fields to only include in the generated form.
             only = defaults.pop('only', [])
 
+            #: Silently ignore exclude elements which aren't mapped
+            #:
+            #: By Default silently ignores missing elements
+            silent_exclude = defaults.pop('silent_exclude', True)
+
         def __init__(self, *args, **kwargs):
             """Sets object as form attribute."""
 

wtforms_alchemy/fields.py

@@ -16,7 +16,6 @@ class SkipOperation(Exception):
     pass
 
 
-
 def get_pk_from_identity(obj):
     cls, key = identity_key(instance=obj)
     return ':'.join(map(six.text_type, key))
@@ -25,8 +24,8 @@ def get_pk_from_identity(obj):
 def labelize(func):
     if func is None:
         return lambda x: x
-    elif isinstance(func, string_types):
-        return operator.attrgetter(func)
+    elif isinstance(func, six.string_types):
+        return six.operator.attrgetter(func)
     else:
         return func
 
@@ -65,7 +64,6 @@ def __iter__(self):
             yield pk, obj
 
 
-
 class ModelFormField(FormField):
     def populate_obj(self, obj, name):
         if self.data:
@@ -77,6 +75,27 @@ def populate_obj(self, obj, name):
         FormField.populate_obj(self, obj, name)
 
 
+class OptionalModelFormField(ModelFormField):
+    def __init__(self, *args, **kwargs):
+        super(OptionalModelFormField, self).__init__(*args, **kwargs)
+
+        # just here to set is_missing form field val to False
+        self.is_missing = True
+
+    def process(self, formdata, **kwargs):
+        super(OptionalModelFormField, self).process(formdata, **kwargs)
+
+        # check if the prefix is found anywhere
+        prefix = self.name + self.separator
+        self.is_missing = not any(
+            key.startswith(prefix) for key in formdata.keys())
+
+    def populate_obj(self, obj, name):
+        # only create a new sub object if the form field wasn't missing
+        if not self.is_missing:
+            super(OptionalModelFormField, self).populate_obj(obj, name)
+
+
 class ModelFieldList(FieldList):
     def __init__(
             self,

wtforms_alchemy/generator.py

@@ -27,7 +27,6 @@
     DecimalField,
     EmailField,
     IntegerField,
-    NumberRangeField,
     PhoneNumberField,
     SelectField,
     StringField,
@@ -88,7 +87,6 @@ class FormGenerator(object):
         (types.ChoiceType, SelectField),
         (types.ColorType, ColorField),
         (types.EmailType, EmailField),
-        (types.NumberRangeType, NumberRangeField),
         (types.PasswordType, PasswordField),
         (types.PhoneNumberType, PhoneNumberField),
         (types.ScalarListType, StringField),
@@ -163,7 +161,10 @@ def filter_attributes(self, attrs):
 
             if self.meta.exclude:
                 for key in self.meta.exclude:
-                    del attrs[key]
+                    if self.meta.silent_exclude and not key in attrs:
+                        continue
+                    else:
+                        del attrs[key]
         return attrs
 
     def validate_attribute(self, attr_name):