I'm using getDefaultSearchContext() to customise the search filters appearing in the ModelAdmin grid view. It works fine for one-to-many relationships, with ExactMatchFilter, but breaks on a many-to-many relationship.

I'm using a ListboxField so that the query generated by ExactMatchFilter is of the form "where q[fieldName] in (1, 2, 3)", but it would need to generate a more complex query than that, which I don't see any signs of in ExactMatchFilter or the other search filter subclasses.

Has anyone else solved this problem? Maybe there's a search filter subclass or an extension that can do it?

I've also ran into this... Anyone have a working solution for this?

Short answer is to make a http://api.silverstripe.org/3.1/class-SearchContext.html (https://docs.silverstripe.org/en/3.2/developer_guides/search/searchcontext/) of your own :)