Allow list types in RootSchemaQuery (#284)

* Allow list types in RootSchemaQuery

* Use list types in schema generation

graphql_compiler/compiler/compiler_frontend.py

@@ -764,6 +764,10 @@ def _compile_root_ast_to_ir(schema, ast, type_equivalence_hints=None):
     # Validation passed, so the base_start_type must exist as a field of the root query.
     current_schema_type = get_field_type_from_schema(schema.get_query_type(), base_start_type)
 
+    # Allow list types at the query root in the schema.
+    if isinstance(current_schema_type, GraphQLList):
+        current_schema_type = current_schema_type.of_type
+
     # Construct the start location of the query and its associated metadata.
     location = Location((base_start_type,))
     base_location_info = LocationInfo(

graphql_compiler/schema_generation/graphql_schema.py

@@ -335,7 +335,7 @@ def get_graphql_schema_from_schema_graph(schema_graph, class_to_field_type_overr
     # Create the root query GraphQL type. Consists of all non-union classes, i.e.
     # all non-abstract classes (as GraphQL types) and all abstract classes (as GraphQL interfaces).
     RootSchemaQuery = GraphQLObjectType('RootSchemaQuery', OrderedDict([
-        (name, GraphQLField(value))
+        (name, GraphQLField(GraphQLList(value)))
         for name, value in sorted(six.iteritems(graphql_types), key=lambda x: x[0])
         if not isinstance(value, GraphQLUnionType)
     ]))

graphql_compiler/tests/test_helpers.py

@@ -157,16 +157,16 @@
     }
 
     type RootSchemaQuery {
-        Animal: Animal
-        BirthEvent: BirthEvent
-        Entity: Entity
-        Event: Event
-        FeedingEvent: FeedingEvent
-        Food: Food
-        FoodOrSpecies: FoodOrSpecies
-        Location: Location
-        Species: Species
-        UniquelyIdentifiable: UniquelyIdentifiable
+        Animal: [Animal]
+        BirthEvent: [BirthEvent]
+        Entity: [Entity]
+        Event: [Event]
+        FeedingEvent: [FeedingEvent]
+        Food: [Food]
+        FoodOrSpecies: [FoodOrSpecies]
+        Location: [Location]
+        Species: [Species]
+        UniquelyIdentifiable: [UniquelyIdentifiable]
     }
 
     type Species implements Entity, UniquelyIdentifiable {