Querying for documents by reference in a post and tag schema

Does anyone know how to query for documents by reference? I have a post document and a tag document. I want to get posts that include any of the tags in an array of tags, but I can't seem to get it to work.
i've created a gist if anyone can help. I've added the query I'm using right now, the schemas for tag and post, and the code for the request i'm making


https://gist.github.com/ellismarte/10bfafe50c1465bcb89d645b82e74f6d#file-queries-L1

You’ll need to do something similar to this !

thank you!

You’re welcome!