crud-service

Simple crud service for object definition, validation, basic persistence and collection.

Installation

npm install @clocklimited/crud-service

Usage

const createCrudService = require('@clocklimited/crud-service')
const save = require('save')
const schema = require('./schema')
const service = createCrudService('things', save('thing'), schema())

// service now has some slightly inflated CRUD functionality:
// .create() .read() .update() .partialUpdate()
// .delete() .deleteMany() .find() .count()

API

var service = new CrudService(String: propertyName, Save: collection, Schemata: schema, Object, options)

Create a new crud service that stores entites in the provided collection. This should be a save instance with your preferred engine. A schemata schema is required for validation

service has the following CRUD-y methods:

service.create(Object: obj, Object: options, Function: cb)

service.read(String: objId, Function: cb)

service.update(Object: obj, Object: options, Function: cb)

service.partialUpdate(Object: obj, Object: options, Function: cb)

service.delete(String: objId, Function: cb)

service.deleteMany(Object: query, Function: cb)

service.find(Object: query, Object: options, Function: cb)

All options arguments are optional.

Omitting cb when calling service.find() will return a stream.

service also has the following method:

service.pre(String: hook, Function: processor)

This facilitates a pipeline for object manipulation before certain operations. pre() can be called multiple times for the same hook and the processor functions will be queued up. A processor function has the signature function (entity, cb) {}, and should callback with cb(err, entity).

A simple example is to maintain a lastUpdated property on service objects:

const setUpdateTime = (entity, cb) => {
  entity.lastUpdated = new Date()
  cb(null, entity)
}

service.pre('update', setUpdateTime)
service.pre('partialUpdate', setUpdateTime)

The available pre hooks are:

• create - after validation, just before persistence
• createValidate - before validation
• update - after validation, just before persistence
• updateValidate - before validation
• partialUpdate - after validation, just before persistence
• partialValidate - before validation
• delete - before deletion

Credits

Paul Serby follow me on twitter @serby

Clock Limited follow us on twitter @clock

License

Licensed under the ISC