Improved registry, raising only when constructing the schema.

docs/registry.rst

@@ -25,7 +25,7 @@ You retrieve using the function ``get_global_registry`` in
             model = ReporterModel
 
     global_registry = get_global_registry
-    global_registry.get_type_for_model(ReporterModel) # == Reporter
+    global_registry.get_unique_type_for_model(ReporterModel) # == Reporter
 
 
 Multiple types for one model

graphene_django/converter.py

@@ -126,7 +126,7 @@ def convert_onetoone_field_to_djangomodel(field, registry=None):
     model = get_related_model(field)
 
     def dynamic_type():
-        _type = registry.get_type_for_model(model)
+        _type = registry.get_unique_type_for_model(model)
         if not _type:
             return
 
@@ -145,7 +145,7 @@ def convert_field_to_list_or_connection(field, registry=None):
     model = get_related_model(field)
 
     def dynamic_type():
-        _type = registry.get_type_for_model(model)
+        _type = registry.get_unique_type_for_model(model)
         if not _type:
             return
 
@@ -163,7 +163,7 @@ def convert_relatedfield_to_djangomodel(field, registry=None):
     model = field.model
 
     def dynamic_type():
-        _type = registry.get_type_for_model(model)
+        _type = registry.get_unique_type_for_model(model)
         if not _type:
             return
 
@@ -183,7 +183,7 @@ def convert_field_to_djangomodel(field, registry=None):
     model = get_related_model(field)
 
     def dynamic_type():
-        _type = registry.get_type_for_model(model)
+        _type = registry.get_unique_type_for_model(model)
         if not _type:
             return
 

graphene_django/registry.py

@@ -1,30 +1,40 @@
+from collections import defaultdict
+
+
 class Registry(object):
 
     def __init__(self):
-        self._registry = {}
-        self._registry_models = {}
+        self._registry = defaultdict(list)
 
     def register(self, cls):
         from .types import DjangoObjectType
         model = cls._meta.model
-        assert self._registry.get(model, cls) == cls, (
-            'Django Model "{}.{}" already associated with {}. '
-            'You can use a different registry for {} or skip '
-            'the global Registry with "{}.Meta.skip_global_registry = True".'
-        ).format(
-            model._meta.app_label,
-            model._meta.object_name,
-            repr(self.get_type_for_model(cls._meta.model)),
-            repr(cls),
-            cls
-        )
         assert issubclass(
             cls, DjangoObjectType), 'Only DjangoObjectTypes can be registered, received "{}"'.format(
             cls.__name__)
         assert cls._meta.registry == self, 'Registry for a Model have to match.'
-        self._registry[cls._meta.model] = cls
+        self._registry[model].append(cls)
 
-    def get_type_for_model(self, model):
+    def get_unique_type_for_model(self, model):
+        types = self.get_types_for_model(model)
+        if not types:
+            return None
+
+        # If there is more than one type for the model, we should
+        # raise an error so both types don't collide in the same schema.
+        assert len(types) == 1, (
+            'Found multiple ObjectTypes associated with the same Django Model "{}.{}": {}. '
+            'You can use a different registry for each or skip '
+            'the global Registry with Meta.skip_global_registry = True". '
+            'Read more at http://docs.graphene-python.org/projects/django/en/latest/registry/ .'
+        ).format(
+            model._meta.app_label,
+            model._meta.object_name,
+            repr(types),
+        )
+        return types[0]
+
+    def get_types_for_model(self, model):
         return self._registry.get(model)
 
 

graphene_django/tests/test_registry.py

@@ -18,29 +18,34 @@ def test_registry_basic():
             model = ReporterModel
 
     assert Reporter._meta.registry == global_registry
-    assert global_registry.get_type_for_model(ReporterModel) == Reporter
+    assert global_registry.get_unique_type_for_model(ReporterModel) == Reporter
 
 
 def test_registry_multiple_types():
+    global_registry = get_global_registry()
+
     class Reporter(DjangoObjectType):
         '''Reporter description'''
         class Meta:
             model = ReporterModel
 
-    class Reporter2(object):
-        pass
-
-    with raises(Exception) as exc_info:
     class Reporter2(DjangoObjectType):
         '''Reporter2 description'''
         class Meta:
             model = ReporterModel
 
+    assert global_registry.get_types_for_model(ReporterModel) == [Reporter, Reporter2]
+
+    with raises(Exception) as exc_info:
+        global_registry.get_unique_type_for_model(ReporterModel) == [Reporter, Reporter2]
+
     assert str(exc_info.value) == (
-      'Django Model "tests.Reporter" already associated with {}. '
-      'You can use a different registry for {} '
-      'or skip the global Registry with "Reporter2.Meta.skip_global_registry = True".'
-    ).format(repr(Reporter), repr(Reporter2))
+       'Found multiple ObjectTypes associated with the same '
+       'Django Model "tests.Reporter": {}. You can use a different '
+       'registry for each or skip the global Registry with '
+       'Meta.skip_global_registry = True". '
+       'Read more at http://docs.graphene-python.org/projects/django/en/latest/registry/ .'
+    ).format(repr([Reporter, Reporter2]))
 
 
 def test_registry_multiple_types_dont_collision_if_skip_global_registry():