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Build GraphQL APIs with Graphene (Big Mountain Data & Dev 2019)
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- 2. Thanks to ourSponsors! Partners Premier Logo:
- 3. About Me @aylakhanaylaykhanayla.khan@gmail.com ● SoftwareEngineer, Data Engineering Team @ Recursion Pharmaceuticals ● Previously: Data Engineer @ ARUP Laboratories, University of Utah Build GraphQL APIs with Graphene
- 4. What is GraphQL? ●Open-source data query & modification language for APIs ○ Declarative data fetching ○ Connected data ● Developed by Facebook, hosted by GraphQL Foundation
- 5. Hello World inGraphene: Query
- 6. Hello World inGraphene: Execute Query root field
- 7. Hello World inGraphene: Results
- 8. What is GraphQL? ●Query language ○ Describes data requirements, actions ■ CRUD operation: query, mutation ● Strong type system ○ Schema definition language (SDL) ○ Static validation
- 9. What is GraphQL? ●Subscription ○ “Real-time” connection to server ■ Typically websockets ○ Event-based ■ Trigger on mutation ■ Pushes changed data payload
- 10. GraphQL Specification ● GraphQLschema language ■ Scalars, list, union, enum, interface ○ Type introspection ● Execution semantics ○ queries: parallel ○ mutations: serial
- 11. Why Use GraphQL? ●Requested data only ○ No over- or underfetching ● Single endpoint ● Combine data from multiple sources ● Describes data relationships
- 12. Why Use GraphQL? ●Deprecation ● Pagination, slicing ● Event-based subscriptions ● Strongly typed ● Detailed errors ● In-browser IDE
- 13. Why Not UseGraphQL? ● GraphQL, database schema duplication ● Harder schema design ● Increased query complexity ● Harder rate limiting
- 14. Why Not UseGraphQL? ● Expensive data operations on server ○ Superfluous database queries ○ Expensive joins in resolver functions ● Caching more complex ● REST is simpler, mature
- 15. What is Graphene? ●Python library to build GraphQL API ○ Schema described in Python code ■ Translate to SDL ○ Build GraphQL service with Flask, Django ○ Execution engine
- 16. Graphene Flask App /graphql sqlite3DB ORM API Description + Query, Mutation
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- 18. SQL ORM Model(models.py)
- 19. ORM Model toGraphQL (schema.py)
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- 26. Query: Connected Data(schema.py, models.py)
- 27. REST vs GraphQL GET/students/{id}/name JSON GET /students/{id}/house JSON GET /students/{id}/houses/{id}/name JSON GET /students/{id}/houses/{id}/crest JSON CLIENT SERVER CLIENT SERVER POST /graphql JSON
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- 33. Combine Types: Union(schema.py)
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- 35. Graphene with RelayFramework ● Reference, refetch objects by ID ● List sorting, slicing, pagination, cursors ● Simplifies, structures mutations ● Reduces boilerplate!
- 36. Schema: Connection (schema.py) ●List of edges ○ Connection between related nodes ○ Slicing, pagination etc.
- 37. Schema: Node (schema.py) ●Data type from model ● Globally unique IDs ● Edges are node list
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- 41. Schema: (Create) Mutation(schema.py)
- 42. Schema: (Create) Mutation(schema.py)
- 43. Schema: (Create) Mutation(schema.py)
- 44. Schema: (Update) Mutation(schema.py)
- 45. Schema: (Update) Mutation(schema.py)
- 46. Schema: (Delete) Mutation(schema.py)
- 47. Schema: (Delete) Mutation(schema.py)
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- 51. Resources ● Learn GraphQL:https://bit.ly/2tH0L5M ● How to GraphQL: https://bit.ly/2FVyXjY ● GraphQL Playground: https://bit.ly/2VGzSeQ ● GraphQL Pagination: https://bit.ly/2UiP9Co ● GraphQL Subscriptions: https://bit.ly/2EIY35k ● GraphQL vs REST: https://bit.ly/2IU83OE, https://bit.ly/2lxUkzN ● Why use GraphQL?: https://bit.ly/2XGGdso ● GraphiQL: GraphQL’s Killer App: https://bit.ly/2tUjmfg ● Using GitHub’s (GraphiQL) GraphQL Explorer: https://bit.ly/31S4lcy ● Graphene: https://bit.ly/2H3j8ev ● Relay: https://bit.ly/2Tyll7s ● Graphene Django: https://bit.ly/2EBzxmO, https://bit.ly/2VBoBfP