@restlessness/dao-mongo

This is the official MongoDB DAO (Data Access Object) for the restlessness framework.

This package relies on the plugin serverless-mongo-proxy to create a database proxy.

Installation

From you restlessness project root run:

$ # Install node package
$ npm i @restlessness/dao-mongo
$
$ # Add it to the project using the restlessness cli
$ restlessness add-dao @restlessness/dao-mongo

The add-dao command installs the serverless-mongo-proxy plugin and adds proper permissions to allow lambda invocation.

Environment variables

Name	Description
MONGO_URI	Database uri (example: mongodb://localhost:27017
MONGO_DB_NAME	Database name

The add-dao command also adds parametric environment variables to the .env files present in the project.

Example .env.production file:

MONGO_URI=${MONGO_URI_PRODUCTION}

Then is possible to set the variable by setting MONGO_URI_PRODUCTION or setting MONGO_URI directly.

Usage

The restlessness web-interface allows creating models based on the exported MongoBase class, which already has convenience methods for db query.

Example:

// src/models/User/index.ts

import { MongoBase } from '@restlessness/dao-mongo';

export default class User extends MongoBase {
  ['constructor']: typeof MyModel
  name: string
  surname: string

  static get collectionName() {
    return 'user';
  }

  // ...
};

All convenience methods can be accessed from the extended class:

// ...
const user = new User();
await user.getById(id);
console.log(user.name, user.surname);

user.name = 'Arthur';
user.surname = 'Dent';
await user.save();
// ...

The package also exports a mongoDao object (of type MongoDao) that can be used to directly run a query.

Example:

// src/endpoints/get-user/handler.ts

import { mongoDao } from '@restlessness/dao-mongo';
// ...
const user = { name: 'Arthur', surname: 'Dent' };
const result = await mongoDao.insertOne('my-collection', user);
// ...

Hooks

The package uses the beforeEndpoint hook to extend the yup validation by defining the yup.objectId validation object.

Documentation

MongoBase class

Methods:

• static get collectionName()
  Returns: the collection name used for all the query

• static get dao(): MongoDao
  Returns: the MongoDao object used to perform all the query

• getById(_id: ObjectId): Promise<boolean>
  Get the resource by assigning it to the current object
  _id: the id of the resource to be queried
  Returns: true if an entry with the provided id has been found, false otherwise

• static getList<T>(query: QuerySelector<T> = {}, limit: number = 10, skip: number = 0, sortBy: string = null, asc: boolean = true): Promise<T[]>
  Get a list of elements satisfying the provided query
  query: query constraint
  limit: maximum number of elements returned
  skip: number of element to be skipped when returning the list
  sortBy: sorting key
  asc: ascending or descending order
  Returns: list of element that satisfy the query

• static getCounter<T>(query: QuerySelector<T> = {}): Promise<number>
  Get the number of element that satisfy the provided query
  query: query constraint
  Returns: number of element that satisfy the QuerySelector

• save(): Promise<boolean>
  Save the current object
  Returns: true if the operation is successful, false otherwise

• update(): Promise<boolean>
  Update the current object
  Returns: true if the operation is successful, false otherwise

• patch(fields: any): Promise<boolean>
  Update the specified fields for the current object fields: fields to the updated
  Returns: true if the operation is successful, false otherwise

• remove<T>(): Promise<boolean>
  Remove the element from the db
  Returns: true if the operation is successful, false otherwise

• static createIndex(keys: string | any, options: IndexOptions): Promise<boolean>
  keys: keys on which the index will be created
  options: index options
  Returns: true if the operation is successful, false otherwise

mongoDao object

Methods:

• invokeProxy(request: ProxyRequest): Promise<InvocationResponse>
  Invoke the database proxy lambda, which will execute the query and return the result
  request: object representing the requested query, see serverless-mongo-proxy for details
  Returns: result of invocation

• findOne(collectionName: string, filter: Object, options?: FindOneOptions): Promise<any>
  collectionName: name of the collection to query
  filter: query filter
  options: see mongodb types for details
  Returns: the object satisfying the query

• find(collectionName: string, filter: Object, options?: FindOneOptions): Promise<any>
  collectionName: name of the collection to query
  filter: query filter
  options: see mongodb types for details
  Returns: the objects satisfying the query

• insertOne(collectionName: string, object): Promise<InsertOneWriteOpResult<null>>
  collectionName: name of the collection to query
  object: the object to be inserted into the db
  Returns: insert result, see mongodb types for details

• updateOne(collectionName: string, filter: Object, object, options?: UpdateOneOptions): Promise<UpdateWriteOpResult>
  collectionName: name of the collection to query
  filter: query filter
  object: the object to be updated
  options: see mongodb types for details
  Returns: update result, see mongodb types for details

• updateMany(collectionName: string, filter: Object, object, options?: UpdateManyOptions): Promise<UpdateWriteOpResult>
  collectionName: name of the collection to query
  filter: query filter
  object: the object to be updated
  options: see mongodb types for details
  Returns: update result, see mongodb types for details

• deleteOne(collectionName: string, filter: Object): Promise<DeleteWriteOpResultObject>
  collectionName: name of the collection to query
  filter: query filter
  Returns: delete result, see mongodb types for details

• deleteMany(collectionName: string, filter: Object): Promise<DeleteWriteOpResultObject>
  collectionName: name of the collection to query
  filter: query filter
  Returns: update result, see mongodb types for details

• count(collectionName: string, filter: Object, options?: MongoCountPreferences): Promise<number>
  collectionName: name of the collection to query
  filter: query filter
  options: see mongodb types for details
  Returns: number of element satisfying the query

• createIndex(collectionName: string, keys: string | any, options: IndexOptions): Promise<string>
  collectionName: name of the collection to query
  keys: keys on which the index will be created
  options: see mongodb types for details Returns: identifier of the created index