Businesses usually involving a broad spectrum of applications, that aren't integrated and requiring human intervention at almost every step of the process, this lack of integration and automation pretend to be solved trought an autogenerated GraphQL API Layer. Grapi make GraphQL API integration simple and easy.

Installation

yarn add @grapi/server

Features

Build GraphQL API with GraphQL SDL

SDL or Schema Definition Language is part of GraphQL Language, to define data and resolvers for the GraphQL API.

# File schema.graphql
enum Gender {
    NO_GENDER,
    FEMALE,
    MALE
}
type Actor @Model( dataSource: "datasource", key: "Actor" ) {
    id: ID ! @unique
    name: String !
    gender: Gender
}

Grapi read SDL types and autogen resolvers for query and mutations on every model defined in SDL schema.

Grapi for Typescript

yarn init
yarn add @grapi/server @grapi/mongodb
yarn add ts-node apollo-server 
yarn add -D typescript

// server.ts
import { readFileSync } from 'fs'
import { resolve } from 'path'
import { MongodbDataSourceGroup } from '@grapi/mongodb'
import { Grapi } from '@grapi/server'
import { ApolloServer } from 'apollo-server'

const getDataSource = async () => {
    const datasource = new MongodbDataSourceGroup(
        process.env.MONGO_URI as string,
        process.env.MONGO_DATA_BASE_NAME as string
    )
    await datasource.initialize()
    return datasource
}

const startGraphQLServer = async () => {
    const datasource = await getDataSource()
    const sdl = readFileSync( resolve( __dirname, 'schema.graphql' ) ).toString()
    const grapi = new Grapi( {
        sdl,
        dataSources: {
            datasource: ( args ) => datasource.getDataSource( args.key ),
        }
    } )
    const server = new ApolloServer( grapi.createApolloConfig() )
    server.listen().then( ( { url } ) => {
        console.info( `GraphQL Server On: ${ url }` )
        console.info( `Go To Browser And See PlayGround` )
    } )
}

startGraphQLServer()

Run server

yarn ts-node server.ts 

You can see the GraphQL server in action with

GraphQL PlayGround

Insomnia

Graphiql

Also Apollo Server offer a GraphQL Playground open your browser http://localhost:4000

Auto-Generated GraphQL Schema

Main characteristic of Grapi is autogen a GraphQL API with types defined in SDL, the previous schema create the next resolvers.

Singular and Plural

type Query {
    actor( where: ActorWhereUniqueInput ): Actor !
    actors( where: ActorWhereInput ): [ Actor ! ] !
}

Create - Update and Delete

type Mutation {
    createActor( data: ActorCreateInput ): Actor !
    updateActor( where: ActorWhereUniqueInput data: ActorUpdateInput ): Actor !
    deleteActor( where: ActorWhereUniqueInput ): Actor !
}

These resolvers serve a schema in a GraphQL Server. Admit retrieve and save data from datasource provided by Mongo DataSource or your custom data source.

RelationShip Made Easy

Database relationships are associations between tables. Grapi support autogen resolvers for queries and mutations in schema relations. It's easy create a complex server with data relations to retrieve and save data.

Next schema examples shows how to create different relationship types.

The key value in directive @Model is the collection name in mongodb

The datasource value in directive @Model is datasource alias defined in Grapi instance into dataSources object. That alias is arbitrary and is allow to named as you wish. The only condition is that in schema the alias has to be the same

One To One Unidirectional

# File schema.graphql
type ActorToAddress implements Relation @config( 
    name: "ActorToAddress"
    foreignKey: { key: "city_id", side: Actor } 
)

type Actor @Model( dataSource: "datasource", key: "Actor" ) {
    id: ID ! @unique
    name: String !
    address: Address @relation( with: ActorToAddress )
}

type Address @Model( dataSource: "datasource", key: "Address" ) {
    id: ID ! @unique
    street: String !
    location: Json
}

One To One Bidirectional

# File schema.graphql
type ActorToAddress implements Relation @config( 
    name: "ActorToAddress"
    foreignKey: { key: "city_id", side: Actor } 
)

type Actor @Model( dataSource: "datasource", key: "Actor" ) {
    id: ID ! @unique
    name: String !
    address: Address @relation( with: ActorToAddress )
}

type Address @Model( dataSource: "datasource", key: "Address" ) {
    id: ID ! @unique
    street: String !
    location: Json
    actor: Actor @relation( with: ActorToAddress )
}

One To Many Bidirectional

# File schema.graphql
type VehiclesFromActor implements Relation @config( 
    name: "VehiclesFromActor"
    foreignKey: { key: "owner_car_id" } 
)

type Actor @Model( dataSource: "datasource", key: "Actor" ) {
    id: ID ! @unique
    name: String !
    vehicles: [ Vehicle ! ] ! @relation( with: VehiclesFromActor )
}

type Vehicle @Model( dataSource: "datasource", key: "Vehicle" ) {
    id: ID ! @unique
    trademark: String !
    model: String
    name: String
    owner: Actor @relation( with: VehiclesFromActor )
}

Many To Many

# File schema.graphql
type MoviesFromActorManyToMany implements Relation @config( name: "MoviesFromActorManyToMany" )

type Actor @Model( dataSource: "datasource", key: "Actor" ) {
    id: ID ! @unique
    name: String !
    movies: [ Movie! ] ! @relation( with: MoviesFromActorManyToMany )
}

type Movie @Model( dataSource: "datasource", key: "Movie" ) {
    id: ID ! @unique
    title: String !
    actors: [ Actor ! ] ! @relation( with: MoviesFromActorManyToMany )
}

Supported data-sources

Grapi Mongodb

License

Apache-2.0

With remote love from Colombia