Add quiz and discussion to GraphQL

Closes RECNVS-28

Test Plan:

- Create a quiz (legacy) and verify that you can access the quiz
  ID through the quiz field on an Assignment through GraphQL
- Create a graded discussion and verify that you can access the
  discussion ID through the discussion field on an Assignment
  through GraphQL

Change-Id: Ifb6d812d0f48d9c5088735b4df656abfe361ffb1
Reviewed-on: https://gerrit.instructure.com/133078
Reviewed-by: Cameron Matheson <cameron@instructure.com>
Tested-by: Jenkins
QA-Review: Collin Parrish <cparrish@instructure.com>
Product-Review: Michael Jasper <mjasper@instructure.com>

app/graphql/types/assignment_type.rb

@@ -22,6 +22,18 @@ module Types
       "when this assignment is due",
       property: :due_at
 
+    field :quiz, Types::QuizType, resolve: -> (assignment, _, _) {
+      Loaders::AssociationLoader.for(Assignment, :quiz)
+        .load(assignment)
+        .then { assignment.quiz }
+    }
+
+    field :discussion, Types::DiscussionType, resolve: -> (assignment, _, _) {
+      Loaders::AssociationLoader.for(Assignment, :discussion_topic)
+        .load(assignment)
+        .then { assignment.discussion_topic }
+    }
+
     field :htmlUrl, UrlType, resolve: ->(assignment, _, ctx) {
       Rails.application.routes.url_helpers.course_assignment_url(
         course_id: assignment.context_id,

app/graphql/types/discussion_type.rb

@@ -0,0 +1,29 @@
+#
+# Copyright (C) 2017 - present Instructure, Inc.
+#
+# This file is part of Canvas.
+#
+# Canvas is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, version 3 of the License.
+#
+# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+module Types
+  DiscussionType = GraphQL::ObjectType.define do
+    name "Discussion"
+
+    implements GraphQL::Relay::Node.interface
+    interfaces [Interfaces::TimestampInterface]
+
+    global_id_field :id
+    field :_id, !types.ID, "legacy canvas id", property: :id
+  end
+end

app/graphql/types/quiz_type.rb

@@ -0,0 +1,29 @@
+#
+# Copyright (C) 2017 - present Instructure, Inc.
+#
+# This file is part of Canvas.
+#
+# Canvas is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, version 3 of the License.
+#
+# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+module Types
+  QuizType = GraphQL::ObjectType.define do
+    name "Quiz"
+
+    implements GraphQL::Relay::Node.interface
+    interfaces [Interfaces::TimestampInterface]
+
+    global_id_field :id
+    field :_id, !types.ID, "legacy canvas id", property: :id
+  end
+end

schema.graphql

@@ -3,6 +3,7 @@ type Assignment implements Node, Timestamped {
   _id: ID!
   createdAt: Time
   description: String
+  discussion: Discussion
 
   # when this assignment is due
   dueAt: String
@@ -16,6 +17,7 @@ type Assignment implements Node, Timestamped {
 
   # determines the order this assignment is displayed in in its assignment group
   position: Int
+  quiz: Quiz
   updatedAt: Time
 }
 
@@ -218,6 +220,14 @@ enum CourseWorkflowState {
   deleted
 }
 
+type Discussion implements Node, Timestamped {
+  # legacy canvas id
+  _id: ID!
+  createdAt: Time
+  id: ID!
+  updatedAt: Time
+}
+
 type Enrollment implements Node, Timestamped {
   # legacy canvas id
   _id: ID!
@@ -368,6 +378,14 @@ type Query {
   ): Node
 }
 
+type Quiz implements Node, Timestamped {
+  # legacy canvas id
+  _id: ID!
+  createdAt: Time
+  id: ID!
+  updatedAt: Time
+}
+
 type Section implements Node, Timestamped {
   # legacy canvas id
   _id: ID!

spec/graphql/types/discussion_type_spec.rb

@@ -0,0 +1,30 @@
+#
+# Copyright (C) 2017 - present Instructure, Inc.
+#
+# This file is part of Canvas.
+#
+# Canvas is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, version 3 of the License.
+#
+# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+require File.expand_path(File.dirname(__FILE__) + '/../../spec_helper')
+require File.expand_path(File.dirname(__FILE__) + '/../../helpers/graphql_type_tester')
+
+describe Types::DiscussionType do
+  let_once(:discussion) { group_discussion_assignment()}
+
+  let(:discussion_type) { GraphQLTypeTester.new(Types::QuizType, discussion) }
+
+  it "works" do
+    expect(discussion_type._id).to eq discussion.id
+  end
+end

spec/graphql/types/quiz_type_spec.rb

@@ -0,0 +1,30 @@
+#
+# Copyright (C) 2017 - present Instructure, Inc.
+#
+# This file is part of Canvas.
+#
+# Canvas is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, version 3 of the License.
+#
+# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+require File.expand_path(File.dirname(__FILE__) + '/../../spec_helper')
+require File.expand_path(File.dirname(__FILE__) + '/../../helpers/graphql_type_tester')
+
+describe Types::QuizType do
+  let_once(:quiz) { quiz_with_submission()}
+
+  let(:quiz_type) { GraphQLTypeTester.new(Types::QuizType, quiz) }
+
+  it "works" do
+    expect(quiz_type._id).to eq quiz.id
+  end
+end