create rest graph

package.json

@@ -16,6 +16,7 @@
   },
   "dependencies": {
     "@graphql-modules/core": "^0.7.15",
+    "apollo-datasource-rest": "^0.9.0",
     "apollo-server-express": "^2.12.0",
     "cookie-parser": "~1.4.4",
     "debug": "~2.6.9",

src/graph/resolvers/index.ts

@@ -5,7 +5,10 @@ export const resolvers = {
   Query: {
     hello,
     getAuthors,
-    getAuthor
+    getAuthor,
+    author: async (_source: any, { id }: any, { dataSources }: any) => {
+      return dataSources.authorAPI.getOneAuthor(id);
+    },
   },
   Mutation: {
     addAuthor

src/index.ts

@@ -3,14 +3,24 @@ import { resolvers }    from './graph/resolvers/index';
 import { ApolloServer } from 'apollo-server-express';
 import { importSchema } from 'graphql-import';
 import '../env';
+import { getAuthor } from './graph/resolvers/query';
+import { AuthorAPI } from './rest/AuthorAPI';
 
 const port = process.env.NODE_PORT;
 const app = express();
 const typeDefs = importSchema('./src/schema/schema.graphql');
-
+app.get('/author/:id', async (req, res) => {
+    const data = await getAuthor({},{id: Number(req.params.id)});
+    res.send(data);
+});
 const server = new ApolloServer({
     typeDefs,
-    resolvers
+    resolvers,
+    dataSources: () => {
+        return {
+            authorAPI: new AuthorAPI()
+        };
+    },
 });
 
 server.applyMiddleware({ app});

src/rest/AuthorAPI.ts

@@ -0,0 +1,15 @@
+import { RESTDataSource } from 'apollo-datasource-rest';
+
+export class AuthorAPI extends RESTDataSource {
+
+  constructor() {
+    super();
+    this.baseURL = 'http://localhost:4000/';
+  }
+
+  async getOneAuthor(id: number) {
+    return this.get(`author/${id}`);
+  }
+
+
+}

src/schema/schema.graphql

@@ -2,6 +2,7 @@
     getAuthors: [Author]
     getAuthor(id: String!): Author
     hello: String
+    author(id: String!): Author
   }
 
   type Mutation {

yarn.lock

@@ -1355,6 +1355,17 @@ apollo-cache-control@^0.9.1:
     apollo-server-env "^2.4.3"
     graphql-extensions "^0.11.1"
 
+apollo-datasource-rest@^0.9.0:
+  version "0.9.0"
+  resolved "https://registry.yarnpkg.com/apollo-datasource-rest/-/apollo-datasource-rest-0.9.0.tgz#20075ecee76c218930f9af5ba0e783023111b217"
+  integrity sha512-UeukRXbuamqhe1P6f0/vVE8iHE4VOWTUULJrDVBysJmw4kMH2kGdc8tlqJGFStmCUtazW0CgWmvpJIPv9Va4kg==
+  dependencies:
+    apollo-datasource "^0.7.0"
+    apollo-server-caching "^0.5.1"
+    apollo-server-env "^2.4.3"
+    apollo-server-errors "^2.4.1"
+    http-cache-semantics "^4.0.0"
+
 apollo-datasource@^0.7.0:
   version "0.7.0"
   resolved "https://registry.yarnpkg.com/apollo-datasource/-/apollo-datasource-0.7.0.tgz#2a6d82edb2eba21b4ddf21877009ba39ff821945"