Graphql queries

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Revision as of 03:14, 2 September 2021 by Will (talk | contribs) (→‎Fragments)

Basics

Without Params

Some fields may be implied by the REST API path, so no params are required.

# https://tracking-system/projects/1/graphql
{
  name
  createdAt
}

With Params

Other times, you may need to use parameters in your query.

# https://tracking-system/projects/1/graphql
{
  tasks($name: String){
    status
    createdAt
  }
}
{"name": "clean bathroom"}

Fragments

Fragments are a named group of fields to select on a specific object-type.
Fragments let you:

  • Select type-specific fields in heterogenous collections
  • Concisely describe a group of fields, DRY out queries
  • Concisely describe Recursive/Nested nodes

TODO:

Example schema

named fragments

{
  children {

    ...nodeFields
    children {

      ...nodeFields {
        children {

          ...nodeFields
        }
      }
    }
  }
}


fragment nodeFields on Node {
  id
  text
  colour
  background-colour
}

inline fragments

{
  rentalInventory {
    vehicles {
      wheels               # select on both Car and Motorcycle
      passengers

      ... on Car {         # select on Car items only
        numSeatbelts
        numAirbags
      }

      ... on Motorcycle {  # select on Motorcycle items only
        numSaddleBags
      }
    }
  }
}