Fixed returning of connection and promise for ConnectionField. Fixed having complete custom edges.

graphene/relay/connection.py

@@ -2,6 +2,7 @@ import re
 from collections import Iterable, OrderedDict
 from functools import partial
 
+from promise import Promise
 import six
 
 from fastcache import clru_cache
@@ -56,15 +57,18 @@ class ConnectionMeta(ObjectTypeMeta):
         )
         options.interfaces = ()
         options.local_fields = OrderedDict()
+        base_name = re.sub('Connection$', '', name)
 
+        if attrs.get('edges'):
+            edges = attrs.get('edges')
+            edge = edges.of_type
+        else:
             assert options.node, 'You have to provide a node in {}.Meta'.format(cls.__name__)
             assert issubclass(options.node, (Node, ObjectType)), (
                 'Received incompatible node "{}" for Connection {}.'
             ).format(options.node, name)
 
             base_name = re.sub('Connection$', '', name)
-        if not options.name:
-            options.name = '{}Connection'.format(base_name)
 
             edge_class = attrs.pop('Edge', None)
 
@@ -82,11 +86,15 @@ class ConnectionMeta(ObjectTypeMeta):
                 edge_attrs.update(additional_attrs)
                 edge = type(edge_name, (ObjectType, ), edge_attrs)
 
+            edges = List(edge)
+
+        if not options.name:
+            options.name = '{}Connection'.format(base_name)
+
         attrs.update({
             'page_info': Field(PageInfo, name='pageInfo', required=True),
-            'edges': List(edge),
+            'edges': edges,
         })
-
         attrs = dict(attrs, _meta=options, Edge=edge)
         return ObjectTypeMeta.__new__(cls, name, bases, attrs)
 
@@ -111,7 +119,7 @@ class Edge(AbstractType):
 def is_connection(gql_type):
     '''Checks if a type is a connection. Taken directly from the spec definition:
     https://facebook.github.io/relay/graphql/connections.htm#sec-Connection-Types'''
-    return gql_type._meta.name.endswith('Connection')
+    return gql_type._meta.name.endswith('Connection') if hasattr(gql_type, '_meta') else False
 
 
 class IterableConnectionField(Field):
@@ -134,22 +142,28 @@ class IterableConnectionField(Field):
 
     @staticmethod
     def connection_resolver(resolver, connection, root, args, context, info):
-        iterable = resolver(root, args, context, info)
-        assert isinstance(iterable, Iterable), (
+        resolved = Promise.resolve(resolver(root, args, context, info))
+
+        def handle_connection_and_list(result):
+            if is_connection(result):
+                return result
+            else:
+                assert isinstance(result, Iterable), (
                     'Resolved value from the connection field have to be iterable. '
                     'Received "{}"'
-        ).format(iterable)
-        # raise Exception('sdsdfsdfsdfsdsdf')
-        connection = connection_from_list(
-            iterable,
+                ).format(result)
+
+                resolved_connection = connection_from_list(
+                    result,
                     args,
                     connection_type=connection,
                     edge_type=connection.Edge,
                     pageinfo_type=PageInfo
                 )
-        # print(connection)
-        connection.iterable = iterable
-        return connection
+                resolved_connection.iterable = result
+                return resolved_connection
+
+        return resolved.then(handle_connection_and_list)
 
     def get_resolver(self, parent_resolver):
         resolver = super(IterableConnectionField, self).get_resolver(parent_resolver)

graphene/relay/tests/test_connection.py

@@ -1,5 +1,5 @@
 from ...types import Field, List, NonNull, ObjectType, String, AbstractType
-from ..connection import Connection, PageInfo
+from ..connection import Connection, PageInfo, Edge
 from ..node import Node
 
 
@@ -10,7 +10,7 @@ class MyObject(ObjectType):
     field = String()
 
 
-def xtest_connection():
+def test_connection():
     class MyObjectConnection(Connection):
         extra = String()
 
@@ -22,7 +22,7 @@ def xtest_connection():
 
     assert MyObjectConnection._meta.name == 'MyObjectConnection'
     fields = MyObjectConnection._meta.fields
-    assert list(fields.keys()) == ['extra', 'page_info', 'edges']
+    assert list(fields.keys()) == ['extra', 'edges', 'page_info']
     edge_field = fields['edges']
     pageinfo_field = fields['page_info']
 
@@ -35,7 +35,52 @@ def xtest_connection():
     assert pageinfo_field.type.of_type == PageInfo
 
 
-def xtest_connection_inherit_abstracttype():
+def test_multiple_connection_edges_are_not_the_same():
+    class MyObjectConnection(Connection):
+        extra = String()
+
+        class Meta:
+            node = MyObject
+
+        class Edge:
+            other = String()
+
+    class MyOtherObjectConnection(Connection):
+        class Meta:
+            node = MyObject
+
+        class Edge:
+            other = String()
+
+    assert MyObjectConnection.Edge != MyOtherObjectConnection.Edge
+    assert MyObjectConnection.Edge._meta.name != MyOtherObjectConnection.Edge._meta.name
+
+
+def test_create_connection_with_custom_edge_type():
+    class MyEdge(Edge):
+        node = Field(MyObject)
+
+    class MyObjectConnection(Connection):
+        extra = String()
+        edges = List(MyEdge)
+
+    assert MyObjectConnection.Edge == MyEdge
+    assert MyObjectConnection._meta.name == 'MyObjectConnection'
+    fields = MyObjectConnection._meta.fields
+    assert list(fields.keys()) == ['extra', 'edges', 'page_info']
+    edge_field = fields['edges']
+    pageinfo_field = fields['page_info']
+
+    assert isinstance(edge_field, Field)
+    assert isinstance(edge_field.type, List)
+    assert edge_field.type.of_type == MyObjectConnection.Edge
+
+    assert isinstance(pageinfo_field, Field)
+    assert isinstance(pageinfo_field.type, NonNull)
+    assert pageinfo_field.type.of_type == PageInfo
+
+
+def test_connection_inherit_abstracttype():
     class BaseConnection(AbstractType):
         extra = String()
 
@@ -45,20 +90,21 @@ def xtest_connection_inherit_abstracttype():
 
     assert MyObjectConnection._meta.name == 'MyObjectConnection'
     fields = MyObjectConnection._meta.fields
-    assert list(fields.keys()) == ['extra', 'page_info', 'edges']
+    assert list(fields.keys()) == ['extra', 'edges', 'page_info']
 
 
-def xtest_defaul_connection_for_type():
+def test_defaul_connection_for_type():
     MyObjectConnection = Connection.for_type(MyObject)
     assert MyObjectConnection._meta.name == 'MyObjectConnection'
     fields = MyObjectConnection._meta.fields
-    assert list(fields.keys()) == ['page_info', 'edges']
+    assert list(fields.keys()) == ['edges', 'page_info']
 
 
-def xtest_defaul_connection_for_type_returns_same_Connection():
+def test_defaul_connection_for_type_returns_same_Connection():
     assert Connection.for_type(MyObject) == Connection.for_type(MyObject)
 
-def xtest_edge():
+
+def test_edge():
     class MyObjectConnection(Connection):
         class Meta:
             node = MyObject
@@ -101,13 +147,13 @@ def test_edge_with_bases():
     assert edge_fields['other'].type == String
 
 
-def xtest_pageinfo():
+def test_pageinfo():
     assert PageInfo._meta.name == 'PageInfo'
     fields = PageInfo._meta.fields
     assert list(fields.keys()) == ['has_next_page', 'has_previous_page', 'start_cursor', 'end_cursor']
 
 
-def xtest_edge_for_node_type():
+def test_edge_for_node_type():
     edge = Connection.for_type(MyObject).Edge
 
     assert edge._meta.name == 'MyObjectEdge'
@@ -118,7 +164,7 @@ def xtest_edge_for_node_type():
     assert edge_fields['node'].type == MyObject
 
 
-def xtest_edge_for_object_type():
+def test_edge_for_object_type():
     class MyObject(ObjectType):
         field = String()
 
@@ -132,5 +178,5 @@ def xtest_edge_for_object_type():
     assert edge_fields['node'].type == MyObject
 
 
-def xtest_edge_for_type_returns_same_edge():
+def test_edge_for_type_returns_same_edge():
     assert Connection.for_type(MyObject).Edge == Connection.for_type(MyObject).Edge

graphene/relay/tests/test_connection_query.py

@@ -1,6 +1,8 @@
 from collections import OrderedDict
 
-from ..connection import ConnectionField
+from promise import Promise
+
+from ..connection import ConnectionField, Connection, PageInfo
 from ..node import Node
 from graphql_relay.utils import base64
 from ...types import ObjectType, String, Schema
@@ -15,12 +17,34 @@ class Letter(ObjectType):
     letter = String()
 
 
+class MyLetterObjectConnection(Connection):
+    extra = String()
+
+    class Meta:
+        node = Letter
+
+    class Edge:
+        other = String()
+
+
 class Query(ObjectType):
     letters = ConnectionField(Letter)
+    letters_promise = ConnectionField(Letter)
+    letters_connection = ConnectionField(MyLetterObjectConnection)
 
-    def resolve_letters(self, args, context, info):
+    def resolve_letters(self, *_):
         return list(letters.values())
 
+    def resolve_letters_connection(self, *_):
+        return MyLetterObjectConnection(
+            extra='1',
+            page_info=PageInfo(has_next_page=True, has_previous_page=False),
+            edges=[MyLetterObjectConnection.Edge(cursor='1', node=Letter(letter='hello'))]
+        )
+
+    def resolve_letters_promise(self, *_):
+        return Promise.resolve(list(letters.values()))
+
     node = Node.Field()
 
 
@@ -75,8 +99,7 @@ def execute(args=''):
     ''' % args)
 
 
-def check(args, letters, has_previous_page=False, has_next_page=False):
-    result = execute(args)
+def create_expexted_result(letters, has_previous_page=False, has_next_page=False, field_name='letters'):
     expected_edges = edges(letters)
     expected_page_info = {
         'hasPreviousPage': has_previous_page,
@@ -84,16 +107,91 @@ def check(args, letters, has_previous_page=False, has_next_page=False):
         'endCursor': expected_edges[-1]['cursor'] if expected_edges else None,
         'startCursor': expected_edges[0]['cursor'] if expected_edges else None
     }
-
-    assert not result.errors
-    assert result.data == {
-        'letters': {
+    return {
+        field_name: {
             'edges': expected_edges,
             'pageInfo': expected_page_info
         }
     }
 
 
+def check(args, letters, has_previous_page=False, has_next_page=False):
+    result = execute(args)
+    assert not result.errors
+    assert result.data == create_expexted_result(letters, has_previous_page, has_next_page)
+
+
+def test_resolver_handles_returned_connection_field_correctly():
+    result = schema.execute('''
+    {
+        lettersConnection {
+            extra
+            edges {
+                node {
+                    id
+                    letter
+                }
+                cursor
+            }
+            pageInfo {
+                hasPreviousPage
+                hasNextPage
+                startCursor
+                endCursor
+            }
+        }
+    }
+    ''')
+
+    assert not result.errors
+    expected_result = {
+        'lettersConnection': {
+            'extra': '1',
+            'edges': [
+                {
+                    'node': {
+                        'id': 'TGV0dGVyOk5vbmU=',
+                        'letter': 'hello',
+                    },
+                    'cursor': '1'
+                }
+            ],
+            'pageInfo': {
+                'hasPreviousPage': False,
+                'hasNextPage': True,
+                'startCursor': None,
+                'endCursor': None,
+            }
+        }
+    }
+    assert result.data == expected_result
+
+
+def test_resolver_handles_returned_promise_correctly():
+    result = schema.execute('''
+    {
+        lettersPromise {
+            edges {
+                node {
+                    id
+                    letter
+                }
+                cursor
+            }
+            pageInfo {
+                hasPreviousPage
+                hasNextPage
+                startCursor
+                endCursor
+            }
+        }
+    }
+    ''')
+
+    assert not result.errors
+    assert result.data == create_expexted_result('ABCDE', field_name='lettersPromise')
+
+
 def test_returns_all_elements_without_filters():
     check('', 'ABCDE')