Parse Cloud Class

A new way to define Parse.Cloud events for your classes (DB tables). With this module you can easily:

• Define minimum values for keys on your classes
• Define default values
• Define required keys
• Use addons to easily extend the funcionality of your app
• Create new addons and share them with the community
• Customize the default behaviour to your own needs

This module is meant to be used with Parse and Parse Server

Installation

> npm install parse-cloud-class

Typescript: This module comes bundled with Intellisense :)

Basic Usage

/*
* This is the main cloud file for Parse
* cloud/main.js
*/
 
// with normal ES5
const ParseCloudClass = require('parse-cloud-class').ParseCloudClass;
 
// with typescript or ES6
import { ParseCloudClass } from 'parse-cloud-class';
 
const myConfig = new ParseCloudClass({
  // new items will not be created if they have no 'name' set
  requiredKeys: ['name']
  defaultValues: {
    // all new items will have active: true
    active: true,
    // by default, timesShared will be 0
    timesShared: 0,
  },
  minimumValues: {
    // timesShared cannot go below 0
    timesShared: 0,
  }
});
 
// Configure your class to use the configuration
ParseCloudClass.configureClass(Parse, 'MyClass', myConfig);

When you configure your classes to work with ParseCloudClass, they will be attached the following events

• beforeFind
• beforeSave
• beforeDelete
• afterSave
• afterDelete

By default, the only event that is going to do something is the beforeSave, that is going to check the minimumValues, defaultValues and requiredKeys

Extending ParseCloudClass

You can easily extend ParseCloudClass in order to define your custom behaviours. In this case, you must have into account the following two extra methods of a ParseCloudClass:

• processBeforeSave: Here you would define your custom behaviour for beforeSave
• processBeforeDelete: Here you would define your custom behaviour for beforeDelete

// myCustomFile.js
import { ParseCloudClass } from 'parse-cloud-class';
 
export class MyCustomClass extends ParseCloudClass {
  /*
  * Here you can define your custom minimumValues, 
  * defaultValues and requiredKeys
  */
  requiredKeys = ['title']
 
  /**
  * @param req {Parse.Cloud.BeforeSaveRequest} 
  */
  async processBeforeSave(req) {
    // Trigger the addons to determine if the object can be saved
    for (const addon of this.addons) {
      req.object = await addon.processBeforeSave(req);          
    }
 
    // write your own code here
    ....
 
    // make sure to return req.object
    return req.object;
  }
}

You can change the implementation of any method to your needs, but please, trigger the addon functions if you expect to have addon functionalities.

Using addons

To use an addon, you would first import it, and then configure your class to use that addon. Example:

// with typescript or ES6
import { ParseCloudClass } from 'parse-cloud-class';
import { SomeAddon } from 'some-addon-module';
 
const myConfig = new ParseCloudClass();
 
// use the addon
myConfig.useAddon(SomeAddon);
 
// you can use any number of addons
myConfig.useAddon(SomeOtherAddon);
 
// Configure your class to use the configuration
ParseCloudClass.configureClass(Parse, 'MyClass', myConfig);

Take into account that addons are executed in the order in which they were added.

Creating addons

Addons can be created by extending ParseCloudClass and defining new behaviours on:

• beforeFind
• beforeSave
• beforeDelete
• afterSave
• afterDelete
• processBeforeSave
• processBeforeDelete

Credits

Developed by Juan Camilo Guarín Peñaranda,
Otherwise SAS, Colombia
2017

License

MIT.