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This topic contains 7 replies, has 3 voices.
Last updated by 4 years, 2 months ago.
Assisted by: Shane.
Hi, if you want to set up a Query Filter to find Users with a NULL value for a date usermeta custom field created in Types, then you could set up a Query Filter as shown in the screenshot here where the field value is a string equal to an empty constant. This User View would then return all Users who have the date custom field key saved in the usermeta table with a NULL or empty value....However, it would be unusual to find this situation, where a NULL or empty value exists for a usermeta date field, in most Toolset sites. When a User is created in wp-admin and no value is provided for the date field, the system does not enter a NULL or empty value in the usermeta table of the database. Instead, the field key is simply not added as a row in the table. This is technically different from a NULL or empty value: the usermeta field does not exist for this User. Similarly, when editing a User in Forms or in wp-admin, if the custom date field has a value set but then it is unset, then the custom field key is usually removed from the database instead of inserting a NULL or empty value.
I want to make sure you have considered this nuance, since the Query Filter I mentioned earlier is only for the case where a NULL or empty value exists in the database. Do you have some custom code in your site that is setting NULL or empty values for this custom date usermeta field?
It turns out it's not so easy to filter a query to show Users that contain a null value in a usermeta field. You can't accomplish it by modifying the meta query terms alone, it requires some modification to the SQL query itself. Here's an example showing how it can be done with a postmeta query: https://wordpress.stackexchange.com/questions/269416/search-custom-post-with-meta-value-null/269444
However, they use a posts_where filter here to modify the SQL query. There isn't a corresponding users_where filter as far as I can tell, so I don't have a cut-and-paste solution here. I guess one workaround would be to get the Users where a date value is set (I believe you mentioned before that you were able to accomplish this), then query all Users and filter out those users where a date value is set (an exclusion filter).
