Generate MongoDB Resolvers for GraphQL Centaurish Way

Once you head down the centaur's path forever will it dominate your destiny.

GraphQL Centaur

Translate GraphQL to Anything and make it your one and only source of truth. It is named centaur because you need to generate resolvers with this CLI and then add some edits to make them custom.

CLI tool to generate MongoDB Stucco Database Resolvers in TypeScript from GraphQL Schema. Compatible with GraphQL Editor projects( Free and Paid Tiers). So the main goal is to provide interactive experience creating GraphQL as a service.

Right now in its early beginnings.

Installation

Global

npm i -g graphql-centaur

Inside Backend Repo

npm i graphql-centaur

then use with npx for example or as a package.json scrip.

Usage

Centaur is an interactive tool to create GraphQL Resolvers connected to MongoDB compatible with stucco hybrid Go and TypeScript backend( the core is a binary and you write in TS). To start using centaur navigate to your backend repository and run command

$ centaur

First it will ask you to configure your project and the source of schema. Next you can create resolvers for your GraphQL Schema.

How it works

Resolver generation

First time when you generate a resolver centaur will also generate needed libraries for collections , DB , Utils and graphql-zeus definitions

Given the following schema:

type Person{
    firstName: String!
}
type Query{
    people: [Person]!
}
schema{
    query: Query
}

After chosing:

Query
people
CRUD
listFilter

It should generate TypeScript resolver placed in $src/Query/people.ts

import { FieldResolveInput, FieldResolveOutput } from "stucco-js";
import { PersonCollection } from "../db/collections";
import { DB } from "../db/mongo";
import { Utils } from "../Utils";
import { Person, ResolverType, ValueTypes } from "../graphql-zeus";

export const handler = async (): Promise<FieldResolveOutput> => {
    const db = await DB();
    const col = await db.collection(PersonCollection);
    return Utils.CursorToGraphQLArray<Person>(
        await col.find({}),
    );
};

and append correct entries to stucco.json file.

{
    "resolvers":{
        "Query.people":{
            "resolve":{
                "name":"lib/Query/people"
            }
        }
    }
}

and after running stucco your resolver should work out of the box.

Some resolver types however need little code to make them work the way you want.

Available Resolvers

Resolvers are split into following categories

CRUD

Create

Create an object in your database and return it

Update

Update an object in your database and return it

List

List all objects of selected type

Get by parameter

Get object by parameter from the database

Remove

Remove object from the database and return true

Common

Pipe

Pipe the arguments of the query as source for the next resolver

Resolver

Simple Resolver you need to write

Rest

Rest proxy resolvers for pointing to existing REST APIs

Source

Resolver that receives source from the parent resolver

SourcedCRUD

The same as CRUD, but also use source