This repo contains some exercises to help you learn the following:

• Thinking in Graphs
• Setting up a GraphQL server using Express
• GraphQL queries
• Pagination using the Relay Cursor Connections specification

http://ec2-35-176-58-126.eu-west-2.compute.amazonaws.com:8080/graphiql

• Query a list of courses
• Query a single course by id
• Query a single course by $id ($id is a variable)
• How many courses in the system?
• How many currencies in the system?
• How many types do we have in the system?

• Make sure you have mongodb available & running
• you can Install mongodb in your mac through brew

• git clone [email protected]:leanjscom/thinking-in-graphql.git
• cd thinking-in-graphql
• create folders needed for your local mongodb database: mkdir data && mkdir data/db
• mongod --dbpath=data/db
• open in a separate shell the project folder and execute the following commands
• yarn install or npm install
• yarn start or npm start

1. In src/server.js add graphqlExpress using https://github.com/apollographql/apollo-server#express.
2. The field currency in Course type (src/graphql/types/course) should be of type CurrencyTypeEnum and should be non null.
3. The course field in src/graphql/fields/course should have the id of the course as an argument
4. Include the Voucher queries into src/graphql/fields/index.js
5. Finish the implementation in the vouchers field in src/graphql/fields/voucher.js
6. Fix the resolver in the voucher field in src/graphql/fields/voucher.js
7. The voucher type (src/graphql/types/voucher.js) should have a field called course that should return the course of that voucher. You should be able to do this https://goo.gl/ffGsDo
8. The course type (src/graphql/types/course.js) should have a field called vouchers that should resolve to a relay connection with all the vouchers of that course. You should be able to do this https://goo.gl/PfRF4K

• http://graphql.org/learn/
• http://graphql.org/learn/thinking-in-graphs/
• https://dev-blog.apollodata.com/graphql-vs-rest-5d425123e34b
• https://dev-blog.apollodata.com/graphql-explained-5844742f195e
• https://facebook.github.io/relay/docs/thinking-in-graphql.html
• https://dev-blog.apollodata.com/the-anatomy-of-a-graphql-query-6dffa9e9e747
• https://github.com/apollographql/apollo-server
• https://www.youtube.com/watch?v=PHabPhgRUuU
• https://facebook.github.io/relay/graphql/connections.htm
• https://dev-blog.apollodata.com/introducing-launchpad-the-graphql-server-demo-platform-cc4e7481fcba
• https://dev-blog.apollodata.com/
• http://dev.apollodata.com

This material is available for private, non-commercial use under the GPL version 3.