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A step-by-step guide on how to filter a custom post type in WordPress using `Advanced Custom Fields`, ensuring only relevant posts show up based on your selected criteria.
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This video is based on the question https://stackoverflow.com/q/66745809/ asked by the user 'BoJack' ( https://stackoverflow.com/u/13002205/ ) and on the answer https://stackoverflow.com/a/66746003/ provided by the user 'BoJack' ( https://stackoverflow.com/u/13002205/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Filter Your Custom Post Type by Advanced Custom Fields in WordPress

When working with WordPress, you might find yourself needing to sort through your custom post types effectively, especially if you're using Advanced Custom Fields (ACF). For example, let's say you have a custom post type called 'Campaigns', and you want to display only those posts that are marked as 'Featured Campaign'. However, getting the query right can be tricky.

In this guide, we’ll guide you through the steps to refine your query so you can successfully filter out only the 'Featured Campaigns'.

The Problem

The issue arises when you attempt to filter the 'Campaigns' custom post type using the ACF select field. You have a select field labeled 'featured' that can have one of two values: Featured Campaign or Not a Featured Campaign. Unfortunately, despite your efforts, using your current WordPress query seems to return the most recently uploaded Campaigns instead of filtering for those with the 'Featured Campaign' designation.

Here’s a simplified outline of your original code:

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

The Flaw

The problem lies in how the meta_query is structured; it doesn't account for necessary nested arrays, which is crucial for a query with conditions like yours.

The Solution

Thanks to input from knowledgeable sources, we’ve arrived at a solution that modifies your $args array. Let's break it down step-by-step.

Updated Query

The corrected version updates the meta_query to include a nested array, which is essential for filtering based on advanced custom fields properly. Here’s the revised code:

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

Explanation of the Changes

Nested Array: The major alteration here is the addition of an inner array for the meta_query. This structure is necessary for WordPress to interpret it correctly.

Consistency in Key and Value: Double-check that the key corresponds precisely to your ACF field name and ensure the value matches exactly what you expect.

Using query_posts: While the current structure will fulfill the filtering requirement, it's important to note that using query_posts can lead to issues if not used properly. A better approach is often to use WP_Query for more advanced control over your queries.

Final Output

Once you replace your code with the updated $args, the output will only show the ‘Campaign’ that has been marked as a ‘Featured Campaign’.

Conclusion

Selecting and filtering custom posts in WordPress is a common task, and when paired with Advanced Custom Fields, it allows for sophisticated content management. Always ensure that your queries are structured correctly, especially when dealing with multiple parameters.

If you encounter similar issues in the future, remember to look closely at the structure of your queries and consider leveraging the community around WordPress for guidance. Happy coding!