Introduction to GraphQL with Ruby
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"Heard the term GraphQL too many times in the past months but not sure exactly what is that fuss about?! Have some clue about the concepts but never saw it in practice? Join this presentation to get a quick summary of the motivators, basic concepts of GraphQL and see a quick demo of implementing a GraphQL schema in Ruby"
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Introduction to GraphQL with Ruby
- 1. Introduction to GraphQL in Ruby Amr Abdelwahab
- 4. How do we currently fetch data? What is GraphQL? Demo Downsides Outline
- 5. A simple UI component
- 6. What data do we need here?
- 11. ● That will expose HREFs of the products ● Fetch the product resources ● Every product resource will expose Hrefs to the product image /cart/:id Reusable Endpoints (REST)
- 13. ● Deeper Nesting? ● Field selection? /cart/:id?expand=products Reusable Endpoints (REST)
- 14. ● What is the convention? /cart/:id?fields=products(name, description, price) Reusable Endpoints (REST)
- 17. Custom Endpoints
- 24. Custom Endpoints Client ● Updates a view ● Creates a new view ● New view version Server ● Updates the endpoint ● Creates a new Endpoint
- 25. What is GraphQL?
- 26. What is NOT GraphQL?
- 27. What is NOT GraphQL? ● Not a database ● Not a library to install ● Not a language specific
- 28. What is GraphQL? ● A query language ○ Data shapes Not Resources ○ Client specified ● A server specs ○ How a server lexes, parses and executes a query?
- 29. Post /graphql
- 30. Post /graphql
- 31. Demo Definition ● Shop(id) ○ Fetch all fields with children products ● product(id) ○ Fetch all fields with product image ● Create a new shop
- 32. Types, fields and arguments
- 33. Types ● Describes a value in the system ● Built in scalar types ● Custom types ○ Object types ○ Custom scalar types ○ Enum types ○ Interface or Union types ○ List types
- 34. Types Example
- 35. Types Example
- 36. Fields and arguments ● Fields are like a function ○ They accept arguments ○ They have a return type
- 37. Types Example
- 49. Project configuration ● Normal rails 5 application ● Add graphql-ruby gem ● rails generate graphql:install ○ Set up a folder structure in app/graphql/ ○ Add schema definition ○ Add a Query type definition ○ Add a route and controller for executing queries ○ Install graphiql-rails
- 57. Query type
- 58. Query type
- 59. Query type
- 61. Query type
- 62. Query type
- 63. Shop Query field
- 64. Shop Query field
- 65. Shop Query field
- 66. Shop Query field
- 68. Shop Query field
- 69. Shop Query field
- 70. Shop Query field
- 71. Shop Type
- 72. Shop Type
- 74. Shop Type
- 76. Shop Type
- 77. Shop Type
- 78. Product Type
- 79. Product Type
- 81. Product Type
- 83. Product Type
- 84. Product Type
- 89. Mutations
- 99. Mutation type
- 100. Mutation type
- 102. Mutation type
- 103. Mutation type
- 104. Create shop mutation
- 105. Create shop mutation
- 106. Create shop mutation
- 107. Create shop mutation
- 108. Create shop mutation
- 110. Create shop mutation
- 111. Principles ● Hierarchical ● Product centric ● Strongly typed ● Client-specified queries ● Introspective ● Version free
- 112. Introspection
- 113. Introspection ● Auto Documentation ● Client side validations ● IDE integrations
- 114. Downsides
- 115. Downsides ● N + 1 queries ● Http Caching ● Security
- 117. E-MAIL info@digitalnatives.hu job@digitalnatives.hu PHONE +36 30 208 5625 ADDRESS Andrássy út 66. Budapest, H-1062 Digital Natives Ltd.