ngalaiko/golangQL

use graphQL syntactics to select fields from json-tagged golang structs to make json api response more compact

golangQL

golangQL allows you to use graphQL syntactics to select fields from json-tagged Golang structs.

Description

func Filter(v interface{}, query string) (interface{}, error)

returns an interface{} value which actually is a map[string]interface{}. Keys of this map are json-tags and values are values of struct fields. So result of json.Marshal(v interface{}) will contain only fields that were described in graphQL query. Null values are skipped.

See example.

Features

All filter functions are cached, for field structs also, so if you request

{
  name {
    firstName 
    lastName
  } 
  nephews { 
    name { 
      firstName 
    } 
  hat 
} 

it also will cache

{
  nephews { 
      name { 
        firstName 
      } 
}

{
  name {
      firstName 
      lastName
    } 
 }

{
  name { 
    firstName 
  } 
}

requests for the relevant types.

Installation

To install the library, run:

go get github.com/ngalayko/golangQL