Magento2 Repository Design Pattern

Introduction

Repositories are a new design pattern introduced in Magento 2 along with interceptors, proxy, and others.

Repositories provide a way to access and manipulate data from and into databases, web services, or other sources.

In simple words, repositories act as an API for third-party developers to access and work with your extension’s complex data.

Problem

If a third-party developer wants to access data from your module, they might first explore your module to find out how to retrieve that data.

They may discover a function that could be useful but realize they cannot directly use it due to some dependencies within the function.

Wanting more flexibility, they might copy the function into their own module and modify it to accept the dependencies as arguments.

While this approach may work as a temporary solution, it introduces risks.

Whenever your original module is updated, the developer would need to manually track and integrate any changes from your code into theirs.

Failing to do so could result in the module breaking or malfunctioning.

In a complex system, where handling and updating data is already challenging, this approach increases the difficulty of maintaining accuracy and system stability.

Some of the problems that can arise if you are not using a standard approach

• Code Duplicity
• Higher chances of buggy code
• Object mocking becomes difficult for testing

Solution

To address this issue, Magento 2 introduced the Repository Design Pattern.

It acts as an intermediary between the data source and the data consumer, centralizing all data access logic within the module.

This design offers several benefits, including:

• Simplifies data access and web services logic by providing a centralized repository-like system.
• Simplifies object mocking so that testing can be done easily.
• Easy to understand for the developer, as he does not need to understand the complex data access and updating logic.
• Repositories can be easily converted to web services, so you do not need to write web services API again.
• Centralize the caching login for the data source

Repositories are very common for programmers who need to manage complex data.

They make developers’ lives easier since it is very rare that repositories’ code is updated except for major updates, so you don’t need to worry much about application break issues.

Go through these links if you want to know about its implementation in the code end:

Create Repositories in Magento 2

How to use Search Criteria in fetching data in Magento 2

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