simenbrekken · December 21, 2016 14:06 · Dec 21, 2016
diff --git a/schema.js b/schema.js
@@ -0,0 +1,62 @@
+import firebase from 'firebase'
+import { filter, map } from 'lodash'
+import { makeExecutableSchema } from 'graphql-tools'
+
+firebase.initializeApp({
+  databaseURL: 'https://grafire-b1b6e.firebaseio.com',
+})
+
+const mapSnapshotToEntity = snapshot => ({ id: snapshot.key, ...snapshot.val() })
+const mapSnapshotToEntities = snapshot => map(snapshot.val(), (value, id) => ({ id, ...value }))
+
+const ref = path => firebase.database().ref(path)
+const getValue = path => ref(path).once('value')
+const getEntity = path => getValue(path).then(mapSnapshotToEntity)
+const getEntities = path => getValue(path).then(mapSnapshotToEntities)
+
+// http://dev.apollodata.com/tools/graphql-tools/resolvers.html
+const resolvers = {
+  Author: {
+    posts(author) {
+      return getEntities('posts').then(posts => filter(posts, { authorId: author.id }))
+    },
+  },
+
+  Post: {
+    author(post) {
+      return getEntities('authors').then(posts => filter(authors, { id: authorId }))
+    },
+  },
+
+  Query: {
+    posts() {
+      return getEntities('posts')
+    },
+
+    authors() {
+      return getEntities('authors')
+    }
+  },
+}
+
+const schema = `
+  type Author {
+    id: Int!
+    firstName: String
+    lastName: String
+    posts: [Post]
+  }
+
+  type Post {
+    id: Int!
+    title: String
+    author: Author
+  }
+
+  type Query {
+    posts: [Post]
+    authors: [Author]
+  }
+`
+
+export default makeExecutableSchema({ typeDefs: schema, resolvers })
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