Move introspection to graphql_server

angel_graphql/example/main.dart

@@ -36,6 +36,8 @@ main() async {
   app.get('/graphiql', graphiql());
 
   await todoService.create({'text': 'Clean your room!', 'completed': true});
+  await todoService.create({'text': 'Take out the trash', 'completed': false});
+  await todoService.create({'text': 'Become a billionaire at the age of 5', 'completed': false});
 
   var server = await http.startServer('127.0.0.1', 3000);
   var uri =

graphql_server/lib/graphql_server.dart

@@ -2,7 +2,7 @@ import 'dart:async';
 
 import 'package:graphql_parser/graphql_parser.dart';
 import 'package:graphql_schema/graphql_schema.dart';
-import 'package:graphql_schema/introspection.dart';
+import 'introspection.dart';
 
 class GraphQL {
   final Map<String, GraphQLType> customTypes = {};
@@ -290,7 +290,7 @@ class GraphQL {
     if (fieldType is GraphQLListType) {
       if (result is! Iterable) {
         throw new GraphQLException(
-            'Value of field "$fieldName" must be a list or iterable.');
+            'Value of field "$fieldName" must be a list or iterable, got $result instead.');
       }
 
       var innerType = fieldType.innerType;

graphql_server/lib/introspection.dart

@@ -1,10 +1,12 @@
+import 'package:graphql_parser/graphql_parser.dart';
 import 'package:graphql_schema/graphql_schema.dart';
 
 // TODO: How to handle custom types???
 GraphQLSchema reflectSchema(GraphQLSchema schema, List<GraphQLType> allTypes) {
   var objectTypes = fetchAllTypes(schema);
-  allTypes.addAll(objectTypes);
   var typeType = _reflectSchemaTypes();
+  var directiveType = _reflectDirectiveType();
+  allTypes.addAll(objectTypes);
 
   var schemaType = objectType('__Schema', fields: [
     field(
@@ -22,9 +24,15 @@ GraphQLSchema reflectSchema(GraphQLSchema schema, List<GraphQLType> allTypes) {
       type: typeType,
       resolve: (_, __) => schema.mutation,
     ),
+    field(
+      'directives',
+      type: listType(directiveType).nonNullable(),
+      resolve: (_, __) => [], // TODO: Actually fetch directives
+    ),
   ]);
 
   allTypes.addAll([
+    directiveType,
     typeType,
     schemaType,
     _reflectFields(),
@@ -156,6 +164,16 @@ GraphQLObjectType _createFieldType() {
   ]);
 }
 
+GraphQLObjectType _reflectDirectiveType() {
+  return objectType('__Directive', fields: [
+    field(
+      'name',
+      type: graphQLString,
+      resolve: (obj, _) => (obj as DirectiveContext).NAME.span.text,
+    ),
+  ]);
+}
+
 List<GraphQLObjectType> fetchAllTypes(GraphQLSchema schema) {
   var typess = <GraphQLType>[];
   typess.addAll(_fetchAllTypesFromObject(schema.query));