Mongoose Schema hasn't been registered for model

Question

I\'m learning the mean stack and when I try to start the server using

npm start

I get an exception saying that:

schema has         


        

Answer 1

You should also check that you don't have dirty data in your database. I ended up with a document containing the lowercased version of the referenced model (user instead of User). This causes the error and is incredibly hard to track down.

Easy to fix with a quick mongo query:

db.model.updateMany({ approvedByKind: 'user' }, { $set: { approvedByKind: 'User' } })