Generating custom field values from other custom fields

• malv

• November 7, 2016 at 8:08 pm

Hello,

i have 2 custom fields DaysOfTheWeek and IndividualDates, which a user can fill for a custom post type event. I want to achieve a meta query for dates and i need to create a sorted list of dates, when an event take place.

My approach would be to generate this sorted date list by computing all date fields (above) to a new (user hidden) custom field as soon as a post is updated. Can you tell me how to create data for a new hidden custom field as soon as the post is updated, so that i can use these hidden custom field data in my query code?

I only need to know how to create custom field data in the backend as a post gets updated.

Thanks a lot!
Kind regards

• James

• November 7, 2016 at 10:22 pm

Hi @malv ,

I believe you can hook into the acf/save_post filter. From here you can create or set the value for your hidden field.

https://www.advancedcustomfields.com/resources/acfsave_post/

Hope that helps.