loopback-graphql-ext-example

$ git clone https://github.com/atul-github/loopback-graphql-ext-example.git
$ cd loopback-graphql-ext-example
$ npm install
$ node .

This is example project to demonstrate features of loopback-graphql-ext project. This project is forked from loopback-example-relation and has added dependency to loopback-graphql-ext project.

Prerequisites

Before starting this tutorial, you must install:

• Node.js
• git client

Reference

• Refer to loopback-example-relation project to understand loopback models used in the project.

Play with loopback-graphql-ext

Open GraphiQL Editor at http://localhost:3000/graphiql

Example 1 - getting Customer records

  Customers{
    find{
      id
      name
      age
      billingAddress{
        id
        street
        city
        state
        zipCode
      }
    }
  }

Example 2 - using simple filter

  Customers{
    find (filter:{where:{name : "Customer D"}}) {
      id
      name
      age
    }
  }

Example 3 - where age is greater than or eqal to 22

  Customers{
    find (filter:{where:{ gte  :{ age : 22 }}}) {
      id
      name
      age
    }
  }

Example 4 - using 'and' filter

  Customers{
    find (filter:{where: { and : [{ gt  :{ age : 22 }}, {name:"Customer C"}]   } }    ) {
      id
      name
      age
   }
  }

Note: See the limitation. gt is used before property which is not similar to loopback.

Example 5 - using 'and' filter and 'inq' filter

  Customers{
    find (filter:{where: { and : [{ gt  :{ age : 22 }},  {inq:{ name : ["Customer C", "Customer D"]}}  ]   } }    ) {
      id
      name
      age
    }
  }

Example 6 - additional nesting in filter with 'or' condition

 Customers{
    find (filter:{where: {or : [ { and : [{ gt  :{ age : 22 }},  {inq:{ name : ["Customer C", "Customer D"]}}  ]   }, {id : 1} ] }   }    ) {
      id
      name
      age
    }
  }

Example 6 - using limit filter

{
  Customers{
    find(filter:{ limit:2, where:{gt:{age:20}}}){
      id
      name
      age
    }
  }
}

Example 7 - using skip

  Customers{
    find(filter:{where:{gt:{id:1 }}, skip : 1} ) {
      id
      name
      age
    }
  }

Example 8 - using Order filter (single field)

  Customers{
    find(filter:{order : name}) {
      id
      name
      age
    }
  }

Example 9 - using Order filter (multiple fields)

  Customers{
    find(filter:{order : [name, age]}) {
      id
      name
      age
    }
  }

Example 10 - using Order filter (multiple fields)

  Customers{
    find(filter:{order : [name_DESC, age]}) {
      id
      name
      age
    }
  }

Note: See the use of DESC (descending). Not able to make like loopback ( order : [name desc, age] )