Solving the Duplicate Posts Issue in Custom Post Types by Taxonomy in WordPress

Discover how to eliminate duplicate posts in a Custom Post Type setup by utilizing an array to track displayed products. This guide provides a simple yet effective solution for WordPress developers.
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This video is based on the question https://stackoverflow.com/q/70979106/ asked by the user 'Junky' ( https://stackoverflow.com/u/1984257/ ) and on the answer https://stackoverflow.com/a/70991916/ provided by the user 'Junky' ( https://stackoverflow.com/u/1984257/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Eliminate Duplicate Posts in Custom Post Types by Taxonomy

Do you have a Custom Post Type called Products in WordPress, where users select categories via an ACF Taxonomy Field? If you’re finding that products are displaying multiple times due to their presence in several categories, you’re not alone. This common problem can be frustrating, especially when you want to ensure a seamless user experience on your website.

Understanding the Problem

When you loop through product categories to display products in WordPress, it’s easy for posts to appear more than once if they belong to multiple categories. This occurs because the query fetches products from each term that they belong to, leading to duplicates on the front end.

Example Scenario

For instance, consider a scenario where you have the following products:

Product A in Category 1 and Category 2

Product B in Category 1

In this case, if both categories are queried separately, Product A will display twice.

The Solution: Tracking Displayed Posts

To resolve this issue, we can create an array that will store the IDs of the products that have already been displayed. If a product is encountered again during the loop, we’ll skip displaying it. Let’s dive into how to implement this in your code.

Step-by-Step Guide

Here’s how to modify your existing code to eliminate duplicates:

Initialize an Array to Track Displayed Products

Before you begin your loop, create an empty array called $displayed_products to hold the IDs of the products that have already been shown.

Check for Duplicates Within the Loop

While iterating through the products, use the in_array function to check if the current product's ID already exists in your $displayed_products array. If it does not, display the product and add its ID to the array.

Updated Code Example

Here’s the revised code that implements the above logic:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following the steps outlined above, you can effectively eliminate duplicate posts in your Custom Post Type setup when displaying products by taxonomy. An array to track displayed products is a simple yet powerful solution that ensures your users only see each product once, regardless of category.

Make sure to test the updated code to confirm that duplicates are resolved, improving the usability and professionalism of your WordPress site. Happy coding!

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