Add prefixes to WordPress post types when a theme is activated

Recently, I had a real problem on my hands.

I had neglected to prefix the post type names in some of my themes, and as it turns out, so did another popular WordPress plugin. Long story short: this plugin became unusable when running my themes, and this did not make my users very happy.

It became clear that I needed to bust out some ninja moves to overcome this dilema.

The code below is the solution I drafted – maybe it will help you too. It’s a function that runs when the theme is in use, and rewrites the post type names in the database with any prefix you choose.

After the theme is activated the specified post types will be renamed to: fjarrett_acme, fjarrett_foo and fjarrett_bar.

Sadly, there is not yet a hook that will fire only when themes are activated/updated. The after_setup_theme action is a little misleading in that it fires when WordPress sets up the current theme, not when an admin activates and/or updates the current theme.

So, it’s basically firing with every load of WordPress when the theme is active. Someone first made a patch for this 3 years ago and it looks like it’s finally being revisited.

For that reason, this is by no means the most resource-friendly solution, but we are killing the script if the prefixed post type already exists – which requires an additional query – but this is crucial for two reasons:

  1. So we’re not attempting to update the database with every page load – after the original post types are given prefixes the database update will never run again.
  2. So other plugins/themes (like the one I was in conflict with) can be installed later, creating their blasphemous post type names, and we won’t attempt to rewrite them.

Hopefully this is helpful to you and your project in some way. If so, please tell me about it the comments!

1 Comment

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  1. Great one man. I’m still planning to use this to fix the terrible name I used for the EDD post type.

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