GraphQL Mongoose Loader 

Install

``
npm i @entria/graphql-mongoose-loader --save
yarn add @entria/graphql-mongoose-loader
`

Mongoose Dataloader Batch

Add batch to your GraphQL resolvers/loaders

Define a mongoose schema for your model
`jsx
import mongoose from 'mongoose';

const Schema = new mongoose.Schema(
{
name: {
type: String,
},
email: {
type: String,
required: true,
index: true,
},
password: {
type: String,
hidden: true,
},
},
{
collection: 'User',
},
);

export default mongoose.model('User', Schema);
`

Create a Dataloader for it

`jsx
import { mongooseLoader } from '@entria/graphql-mongoose-loader';
import UserModel from './User';

export const getLoader = () => new DataLoader(ids => mongooseLoader(UserModel, ids));
`

Connection from Mongoose Cursor

Create a connection from mongoose cursor

`jsx
import { connectionFromMongoCursor } from '@entria/graphql-mongoose-loader';

export const loadUsers = async (context: GraphQLContext, args: ConnectionArguments) => {
const where = args.search
? {
name: {
$regex: new RegExp(^${args.search}, 'ig'),
},
}
: {};
const users = UserModel.find(where, { _id: 1 }).sort({
createdAt: -1,
});

return connectionFromMongoCursor({
cursor: users,
context,
args,
loader: load,
});
};
`

Connection from Mongoose Aggregate

Create a connection from mongoose aggregate

`jsx
import { connectionFromMongoAggregate } from '@entria/graphql-mongoose-loader';

export const loadUsersThatHaveGroup = async (context: GraphQLContext, args: ConnectionArguments) => {
const aggregate = GroupModel.aggregate([
{
$lookup: {
from: 'User',
localField: 'users',
foreignField: '_id',
as: 'users',
},
},
{
// remove empty groups
$match: { users: { $exists: true, $ne: [] } },
},
{
// promote each user to a new document
$unwind: '$users',
},
{
$sort: {
_id: 1,
},
},
{
$replaceRoot: { newRoot: '$users' },
},
]);

return connectionFromMongoAggregate({
aggregate,
context,
args,
loader: load,
});
};
``