DevNexus 2019: GraphQL From Beginner to Expert in 60 Minutes
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GraphQL from the ground up. What is it? Schema and Type System, Server and Client Execution. Use Cases
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DevNexus 2019: GraphQL From Beginner to Expert in 60 Minutes
- 1. Yoel Spotts Director, Platform Architecture March 8, 2019 GraphQL From Beginner to Expert in 60 minutes The Prequel
- 2. 2 Agenda •What is GraphQL? •Schema/Type System •Server Execution •Client Operations •Use Cases •Advanced Topics
- 4. 4 Query Language and Data Representation
- 10. 10 Schema Basics Type Definition Fields Scalar Type Object Type ListNot Null
- 11. 11 Arguments & Custom Scalar Types
- 12. 12 Query & Mutation Types
- 13. 13 Interfaces
- 16. 16 Server Execution •Read schema •Define Resolvers •Wiring •Validation of query •Execute query
- 17. 17 HTTP •/graphql •GET /graphql?query=…&variables=… •POST /graphql •Query, variables in body
- 19. 19 Client Tools
- 20. 20 Client Tools
- 25. 25 Use Case: API Gateway
- 28. 28
Editor's Notes
- Spoke last year Not enough basics That’s why it’s the prequel
- Need to understand core Lose spec from the framework Use cases only at the end
- Shape of a graph Very flexible
- Can write library in any language Spec not the implementation
- GraphQL is an API
- Some projects obscure the distinction Could be different languages Over http
- Will cover most if the basics IDL – spec defines own language which is prog lang independent Shared client and server; way to introspect Usually defined in a file
- Scalar – primitive; leaf node; implementation Object – like OO Can build complex List- elements can be null or non null
- Star Wars motif ID type – String but opaque
- Root types Implement the ones you want
- We will see example of schema Mostly demo
- First three happen at startup Next two at request is processed
- Everything is json Now demo
- Show its an http client
- Help construct query Caching Authorization Subscriptions Integration FE componenets
- Redux
- Replacement or complimentary Don’t use all verbs, one endpoint Flexible – many at once; versioning
- Pattern; not api gw; pattern for api gw or on top of