I have 3 custom post types, which are related to each other. Projects, Positions and Feedbacks. 1 Project has many Positions and 1 Position has many Feedbacks.
Relations are defined with meta values. Feedbacks post has a meta value, where the value points to position post id, and Positions post has a meta value, where the value points to project post id.
I want to create a custom filter in Feedback admin list, where rows are filtered by project.
It would be nice to do it with a ‘parse_query’ filter, since I already have some filters attached to it.
How to achieve this?