Add contrib methods to make setting work correctly

src/django_richenum/models/fields.py

@@ -5,12 +5,35 @@
 from richenum import RichEnumValue, OrderedRichEnumValue
 
 
+# https://github.com/django/django/blob/64200c14e0072ba0ffef86da46b2ea82fd1e019a/django/db/models/fields/subclassing.py#L31-L44
+class Creator(object):
+    """
+    A placeholder class that provides a way to set the attribute on the model.
+    """
+    def __init__(self, field):
+        self.field = field
+
+    def __get__(self, obj, type=None):
+        if obj is None:
+            return self
+        return obj.__dict__[self.field.name]
+
+    def __set__(self, obj, value):
+        obj.__dict__[self.field.name] = self.field.to_python(value)
+
+
 class IndexEnumField(models.IntegerField):
     '''Store ints in DB, but expose OrderedRichEnumValues in Python.
 
     '''
     description = 'Efficient storage for OrderedRichEnums'
 
+    def contribute_to_class(self, cls, name, **kwargs):
+        super(IndexEnumField, self).contribute_to_class(cls, name, **kwargs)
+
+        # Add Creator descriptor to allow the field to be set directly
+        setattr(cls, self.name, Creator(self))
+
     def __init__(self, enum, *args, **kwargs):
         if not hasattr(enum, 'from_index'):
             raise TypeError("%s doesn't support index-based lookup." % enum)
@@ -110,6 +133,12 @@ class CanonicalNameEnumField(models.CharField):
     '''
     description = 'Storage for RichEnums'
 
+    def contribute_to_class(self, cls, name, **kwargs):
+        super(CanonicalNameEnumField, self).contribute_to_class(cls, name, **kwargs)
+
+        # Add Creator descriptor to allow the field to be set directly
+        setattr(cls, self.name, Creator(self))
+
     def __init__(self, enum, *args, **kwargs):
         if not hasattr(enum, 'from_canonical'):
             raise TypeError("%s doesn't support canonical_name lookup." % enum)