Elixir absinthe-basics
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This document discusses GraphQL and Absinthe, a GraphQL toolkit for Elixir. It provides an overview of GraphQL, describing it as a query language for APIs that allows requesting specific data fields and includes type systems. It then discusses building a sample Todo application using Absinthe to manage todo data, including designing a schema, queries, and mutations. It also briefly mentions additional GraphQL features like variables, unions, interfaces, and subscriptions that can be implemented, as well as organizing code, authentication, and performance tuning.
Elixir absinthe-basics
- 2. GraphQL ● A query language for your API – Ask for what you need, get exactly that. – Get many resources in a single request – Describe what is possible with a type system – Move faster with powerful developer tools – Bring your own data an code – Evolve your API without versions http://graphql.org/
- 3. GraphQL as Specification – Language – Type System – Introspection – Validation – Execution – Response http://facebook.github.io/graphql/October2016/
- 4. GraphQL ● Why? – REST (REpresentational State Transfer) ● What is on the response? ● What if we need more info ● What if we don’t need all the info ● Validations – GraphQL ● Give the developer a query language to interact with the server ● Provides validation of data by default ● Handle relationships ● Give proper error messages ● What you ask is what you expect ● Single point of entrance
- 6. GraphQL ● It’s not magic ● You need to build the representation of your data.
- 9. What is Absinthe ● GraphQL toolkit for elixir – absinthe – absinthe_plug – absinthe_phoenix
- 10. Absinthe
- 11. Basic Sample ● Create a API to manage a Todo application. – Design a Schema – Query – Mutation – Test
- 12. “Todo” DB
- 14. “Todo” GraphQL Schema ● Queries { todos { name categories { name } } }
- 15. TODO GraphQL Create a phx app
- 16. TODO GraphQL Create a phx app
- 17. TODO GraphQL Add tables and run migration
- 18. TODO GraphQL Add tables and run migration
- 19. TODO GraphQL Create seed data
- 20. TODO GraphQL Add absinthe library
- 24. Query Sample
- 26. Other Fun Stuff ● Use variables to do queries – Unions – Interfaces – Fragments ● Create your own Scalar types – Parse – Serialize ● Organize your code – Import fields – Import types ● Subscriptions ● Publishing your code “middleware” ● Authentication and Authorization ● Tunning Performance
- 27. References ● http://graphql.org/ ● http://facebook.github.io/graphql/October2016/ ● Williams, B. Willson, B. (2017). Craft GraphQL APIs in Elixir with Absinthe, Beta (Nov. 2017): The pragmatic programmers.
- 28. Next Meetups ● Elixir – Ecto – Test – OTP