How do you insert a “reference” value into firestore?

Question

I\'m trying to insert a document into a collection. I want the document to have a attribute of type reference to insert into the collection. But every time I in

Answer 1

Probably the simplest solution is to set the value of a reference key to a doc(collection/doc_key) because a DocumentReference is needed.

Example code:

post = {
  content: "content...",
  title: "impressive title",
  user: db.doc('users/' + user_key),
};

db.collection('posts').add(post)