[GraphQL] Reuse Query Fields with GraphQL Fragments

A GraphQL fragment encapsulates a collection of fields that can be included in queries. In this video, we'll look at how to create fragments on types to reduce the amount of typing that needs to occur as queries become more complex. We'll use the GitHub API to test.

 

We have:

复制代码
# Type queries into this side of the screen, and you will 
# see intelligent typeaheads aware of the current GraphQL type schema, 
# live syntax, and validation errors highlighted within the text.

# We'll get you started with a simple query showing your username!
query { 
  organization(login: "moonhighway") {
    email,
    url,
    repository(name: "learning-graphql") {
      url,
      description
    }
  },
  repository(owner:"facebook" name:"graphql"){
    url,
    description,
    name,
    languages(first:1){
      nodes {
        name
      }
    }
  }
}
复制代码

 

To resue 'url', 'description' for Repository, we can create fragment:

fragment CommonFields on Repository {
  url,
  description
}

 

Therefore, we can reuse it:

复制代码
# Type queries into this side of the screen, and you will 
# see intelligent typeaheads aware of the current GraphQL type schema, 
# live syntax, and validation errors highlighted within the text.

# We'll get you started with a simple query showing your username!
query { 
  organization(login: "moonhighway") {
    email,
    url,
    repository(name: "learning-graphql") {
      ...CommonFields
    }
  },
  repository(owner:"facebook" name:"graphql"){
    ...CommonFields
    name,
    languages(first:1){
      nodes {
        name
      }
    }
  }
}

fragment CommonFields on Repository {
  url,
  description
}
复制代码

 

posted @   Zhentiw  阅读(220)  评论(0编辑  收藏  举报
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