​​Course Outline - Intro to GraphQL
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​​Day 1

  • ​​GraphQL is a query language and a type system
  • ​​Unlike REST, GraphQL uses a single endpoint
  • ​​The simplest type: scalars
  • ​​Can add comments to a query
  • ​​Types: Scalars, Objects, Lists
  • ​​GraphQL playground: ctrl+space to show available fields; cmd+click to GTD
  • ​​A GraphQL API can be queried using plain HTTP POST (curl/fetch)
  • ​​Schema Definition Language (SDL)
  • ​​Building a GraphQL server: typeDefs and resolvers
  • ​​Deeply nested field selections
  • ​​Query args (e.g. task ID)
  • ​​Aliases (e.g. same field with different params)
  • ​​Multiple queries within a single request
  • ​​Argument/Parameter Defaults
  • ​​Named Queries (typically use UpperCamelCase)
  • ​​Mutations (e.g. createAccount)
  • ​​Query variables
  • ​​Async resolvers; persisting data to a database
​​

​​Day 2

  • ​​Custom resolver chains for deep nesting and circular relationships
  • ​​Context, headers and auth
  • ​​__typename​ field implicit on all types
  • ​​Frontend:
  • ​​Apollo Client and React
  • ​​Tagged template literals and gql``
  • ​​Using variables to pass dynamic input
  • ​​Params received at `mutation()` level
  • ​​Using React hooks; useQuery and useMutation
  • ​​Refresh a query after a mutation
  • ​​Mutations for authentication
  • ​​Context in Apollo Server
  • ​​Fragments
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