Problem: I am trying to use a meta_query with the post relationships API toolset_get_related_posts, but it doesn't seem to be filtering as expected.
Solution: Some complex meta_queries, like using "IN" or "AND" with more than one term, fail with the post relationships API. Instead, you should use a standard WP_Query and add the toolset_relationships clause:
Problem: I would like to display information from a related post in a many-to-many relationship, using a "Fields and Text" or a "Single Field" block. In the past I was able to do this with a one-to-many relationship to display information from the parent post in the child post template, but it doesn't work for a many-to-many relationship.
Solution: Since there is the possibility of having multiple related posts instead of just one, you should use a View of related posts to display this information. Add a post relationship query filter, and insert the field in the View's loop.
