Video 10: write a mutation.

.idea/workspace.xml

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@@ -440,16 +442,16 @@
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index.js

@@ -13,6 +13,7 @@ const {
   GraphQLString,
 } = require('graphql');
 const {
+  createVideo,
   getVideoById,
   getVideos
 } = require('./src/data/index');
@@ -70,10 +71,52 @@ const queryType = new GraphQLObjectType({
   }
 });
 
+/* Example mutation use:
+
+mutation M {
+ createVideo(
+   title: "A new hope",
+   duration: 7260,
+   released: true
+ ) {
+   id,
+   title
+   }
+ }
+
+
+ */
+const mutationType = new GraphQLObjectType({
+  name: 'Mutation',
+  description: "The root Mutation type",
+  fields: {
+    createVideo: {
+      type: videoType,
+      args: {
+        title: {
+          type: new GraphQLNonNull(GraphQLString),
+          description: 'The title of the video'
+        },
+        duration: {
+          type: new GraphQLNonNull(GraphQLInt),
+          description: 'The duration of the video, in seconds'
+        },
+        released: {
+          type: new GraphQLNonNull(GraphQLBoolean),
+          description: "Whether or not the video is released"
+        }
+      },
+      resolve: (_, args) => {
+        return createVideo(args);
+      }
+    }
+  }
+});
+
 const schema = new GraphQLSchema({
+  mutation: mutationType,
   query: queryType
   // Also available:
-  // mutation: ...
   // subscription: ...
 });
 

src/data/index.js

@@ -14,6 +14,17 @@ const videoB = {
 
 const videos = [videoA, videoB];
 
+const createVideo = ({ title, duration, released }) => {
+  const video = {
+    id: (new Buffer(title, 'utf8')).toString('base64'),
+    title,
+    duration,
+    released
+  };
+  videos.push(video);
+  return video;
+};
+
 const getVideoById = (id) => new Promise((resolve) => {
   const [video] = videos.filter(currentVideo => currentVideo.id === id);
 
@@ -26,5 +37,6 @@ const getVideoById = (id) => new Promise((resolve) => {
 // General case: asynchronously load the videos
 const getVideos = () => new Promise(resolve => resolve(videos));
 
+exports.createVideo = createVideo;
 exports.getVideoById = getVideoById;
 exports.getVideos = getVideos;