Introspection of interface types complete

angel_graphql/example/main.dart

@@ -61,10 +61,15 @@ main() async {
   print('Access graphiql at $graphiqlUri');
 }
 
+@GraphQLDocumentation(description: 'Any object with a .text (String) property.')
+abstract class HasText {
+  String get text;
+}
+
 @serializable
 @GraphQLDocumentation(
     description: 'A task that might not be completed yet. **Yay! Markdown!**')
-class Todo extends Model {
+class Todo extends Model implements HasText {
   String text;
 
   @GraphQLDocumentation(deprecationReason: 'Use `completion_status` instead.')

graphql_server/lib/introspection.dart

@@ -427,12 +427,8 @@ List<GraphQLType> _fetchAllTypesFromObject(GraphQLObjectType objectType) {
     }
   }
 
-  for (var type in objectType.interfaces) {
-    types.addAll(_fetchAllTypesFromObject(type));
-  }
-
-  for (var type in objectType.possibleTypes) {
-    types.addAll(_fetchAllTypesFromObject(type));
+  for (var i in objectType.interfaces) {
+    types.addAll(_fetchAllTypesFromObject(i));
   }
 
   return types;

graphql_server/lib/mirrors.dart

@@ -56,8 +56,9 @@ GraphQLType _objectTypeFromDartType(Type type, [List<Type> typeArguments]) {
 GraphQLObjectType objectTypeFromClassMirror(ClassMirror mirror) {
   var fields = <GraphQLField>[];
 
-  for (var name in mirror.instanceMembers.keys) {
-    var methodMirror = mirror.instanceMembers[name];
+  void walkMap(Map<Symbol, MethodMirror> map) {
+    for (var name in map.keys) {
+      var methodMirror = map[name];
       var exclude = _getExclude(name, methodMirror);
       var canAdd = name != #hashCode &&
           name != #runtimeType &&
@@ -67,11 +68,59 @@ GraphQLObjectType objectTypeFromClassMirror(ClassMirror mirror) {
         fields.add(fieldFromGetter(name, methodMirror, exclude, mirror));
       }
     }
+  }
+
+  walkMap(mirror.instanceMembers);
+
+  if (mirror.isAbstract) {
+    var decls = <Symbol, MethodMirror>{};
+
+    mirror.declarations.forEach((name, decl) {
+      if (decl is MethodMirror) {
+        decls[name] = decl;
+      }
+    });
+
+    walkMap(decls);
+  }
+
+  var inheritsFrom = <GraphQLObjectType>[];
+  var primitiveTypes = const <Type>[
+    String,
+    bool,
+    num,
+    int,
+    double,
+    Object,
+    dynamic,
+    Null,
+    Type,
+    Symbol
+  ];
+
+  void walk(ClassMirror parent) {
+    if (!primitiveTypes.contains(parent.reflectedType)) {
+      if (parent.isAbstract) {
+        var obj = convertDartType(parent.reflectedType);
+
+        if (obj is GraphQLObjectType && !inheritsFrom.contains(obj)) {
+          inheritsFrom.add(obj);
+        }
+      }
+
+      walk(parent.superclass);
+      parent.superinterfaces.forEach(walk);
+    }
+  }
+
+  walk(mirror.superclass);
+  mirror.superinterfaces.forEach(walk);
 
   return objectType(
     MirrorSystem.getName(mirror.simpleName),
     fields: fields,
     isInterface: mirror.isAbstract,
+    interfaces: inheritsFrom,
     description: _getDescription(mirror.metadata),
   );
 }
@@ -85,9 +134,7 @@ GraphQLEnumType enumTypeFromClassMirror(ClassMirror mirror) {
       values.add(
         new GraphQLEnumValue(
           MirrorSystem.getName(name),
-          mirror
-              .getField(name)
-              .reflectee,
+          mirror.getField(name).reflectee,
           description: _getDescription(methodMirror.metadata),
           deprecationReason: _getDeprecationReason(methodMirror.metadata),
         ),