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Magento 2 Plugins

By |August 14, 2015 January 3rd, 2022No Comments

Migrate to Magneto 2 now. Go live in 3 weeks from our team of Magento certified professionals.

We have been actively blogging on the new features and functionalities in Magento 2. In that series, this blog is about Magento 2 plugins.Here we discuss the plugin structure and how to create a plugin.

Magento 2 Plugin
  • Plugin is a class which changes the behavior of an original method in Magento code.
  • Magento 2 introduces interception concept which avoid conflicts between extensions, which changes the behavior of the same class or method.
  • Plugin uses before, after, or around an original method. 
Listeners in Plugin
  • beforemethodname() -> to change the arguments of an original method or add some behavior before an original method is called, use the before-listener method. The before prefix should be added to the name of an original method. 
  • aftermethodname() -> to change the values returned by an original method or add some behavior after an original method is called, use the after-listener method. The after prefix should be added to the name of an original method. 
  • aroundmethodname() -> to change both the arguments and returned values of an original method or add some behavior before and after an original method is called, use the around-listener method. The around prefix should be added to the name of an original method. 
Declaring a Plugin

A plugin can be declared in di.xml file. The declaration syntax for plugin is

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type name -> a class, interface, or virtual type, which is observed by a plugin.
plugin name -> an arbitrary plugin name
plugin type -> the name of a plugin’s class or virtual type
plugin sortOrder -> order, in which the plugins calling the same method are to be executed.
plugin disabled ->to disable a plugin, the value of the element should be set to ‘true.’

Sample Plugin from module Catalog -> di.xml

“clean(MagentoLogModelLog $object)” in type MagentoLogModelResourceLog  is overwritten by the method “afterClean(MagentoLogModelResourceLog $subject, $logResourceModel)” found in Plugin file “MagentoCatalogModelPluginLog”.

MagentoLogModelResourceLog.php file

MagentoCatalogModelPluginLog.php file

Creating a Plugin

Please refer the below blog for creating a module.
After creating a module, please follow the below steps for creating a plugin.

Step 1: Create the Block file app/code/Dckap/Welcome/Block/Welcome.php

Step 2: In /app/code/Dckap/Welcome/view/frontend/templates/ create a template file welcome.phtml

Step 3: Create the file di.xml inside app/code/Dckap/Welcome/etc/

Add the below lines in di.xml

Step 4: Create a model file Welcome1.php inside the path app/code/Dckap/Welcome/Model

Magento 2 plugins 1

Please take a look on ‘Hello World’ text displayed in the front end of the module.

Step 5:  Create a Plugin folder inside Model folder of the module.

File Welcome2.php needs to be created inside that Plugin folder.

The  beforeDckModelWelcome method in the  Welcome2.php file appends ‘Welcome to ‘ text with ‘Hello World‘ text of  DckModelWelcome method present inside  Welcome1.php file.

Magento 2 plugins 2


Plugin does not apply to following Scenario

  •           Classes created without dependency injection
  •           Final methods
  •           Final classes

As Magento 2 is coming, it’s a good idea to become familiar with its various new features and functionalities instead of waiting until the last hour.

Hopefully this blog is a good motivation and/or introduction to get started with Magento 2 plugin development.

Amala Loganathan

Author Amala Loganathan

Amala is a Product lead for Productimize, a product customization solution from DCKAP, with vast experience in developing eCommerce solutions and transforming business needs into technical specifications. Passionate about anything and everything in eCommerce.

More posts by Amala Loganathan

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