GraphQL 风格的查询语言 dinoQL

MIT
JavaScript
跨平台
2019-05-12
红薯

dinoql 是一个可定制化的 GraphQL 风格的查询语言,用于实现与 JavaScript 对象进行交互。使用 dinoQL 可以像用 GraphQL 遍历 API 一样遍历 JavaScript 对象。

使用和 GraphQL 同样的做法的目的是因为:

使用示例

以下例子都使用如下数据:

const data = {
requests: {
products: [],
users: [{
name: 'Victor Igor',
id: "100",
age: 40
}, {
name: 'Kant Jonas',
id: "200",
age: 35
}],
friends: [{
name: 'Kátia',
id: "300",
age: 10
}]
}
}

Getting only name from users

import dinoql from 'dinoql'
const users = dinoql(data)`
requests {
users {
name
}
}
`
console.log(users) //{ users: [{ name: 'Victor Igor' }, { name: 'Kant Jonas' }] }

Get user by id

import dinoql from 'dinoql'
const users = dinoql(data)`
requests {
users(id: "200") {
name
}
}
`
console.log(users) //{ users: [{ name: 'Kant Jonas' }] }

Aliases - Renaming keys

import dinoql from 'dinoql'
const users = dinoql(data)`
requests {
changeUsers: users(id: "200") {
name
}
}
`
console.log(users) //{ changeUsers: [{ name: 'Kant Jonas' }] }

Resolvers

Resolvers provide the instructions for turning a dinoQL operation into data.

Order by

import dinoql from 'dinoql'
const users = dinoql(data)`
requests {
users(orderBy: age) {
name,
age
}
}
`
console.log(users) 
//{ users: [{ name: 'Kant Jonas', age: 35 }, { name: 'Victor Igor', age: 40 }] }

Default value

import dinoql from 'dinoql'
const users = dinoql(data)`
requests {
notfound(defaultValue: "Hello")
}
`
console.log(users) 
// {notfound: "Hello"}

Parse to Number

import dinoql from 'dinoql'
const users = dinoql(data)`
requests {
users {
id(toNumber: 1)
}
}
`
console.log(users)  //{ users: [{ id: 100 }, { id: 200 }] }

First

import dinoql from 'dinoql'
const users = dinoql(data)`
requests {
users(first: true) {
name
}
}
`
console.log(users)  //{ users: { name: 'Victor Igor' } }

Last

import dinoql from 'dinoql'
const users = dinoql(data)`
requests {
users(last: true) {
name
}
}
`
console.log(users)  //{ users: { name: 'Kant Jonas' } }

Building your own resolver

You can create a function to change a value in query.

import dql, { addResolvers } from 'dinoql';
const incAge = (list, right) => {
const valueToInc = Number(right);
return list.map(item => ({ ...item, age: item.age + valueToInc }));
};
addResolvers(({ incAge }));
const value = dql(data)`
requests {
users(incAge: 2) {
name,
age
}
}
`;
// { users: [{ name: 'Victor Igor', age: 42 }, { name: 'Kant Jonas', age: 37 }] }

Custom options

Keep structure

import dinoql from 'dinoql'
const users = dinoql(data, { keep: true })`
requests {
users(id: "200") {
name
}
}
`
console.log(users)
/*
{ 
requests: { 
users: [{ name: 'Kant Jonas' }] 
}
} 
*/

Improve performance

You can improve performance parsing in build time your queries.

How ?

  1. Create files  .graphql  or  .gql  and add your queries.

  2. Import your queries from  .graphql|.gql

# your queries
query MyQuery {
requests {
users
}
}
//your js
import dinoql from 'dinoql'
import { MyQuery } from './MyQueries';
const users = dinoql(data)(MyQuery)
  1. Setup your webpack - example

Fragments support

You can share piece of query logic.

fragment queryOne on Query {
users {
name
}
}
fragment queryTwo on Query {
products
}
query Form {
requests {
...queryOne,
...queryTwo,
friends
}
}
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