HABTM relation find all records, excluding some based on association

Question

I\'ve looked at some of the similar SO posts relating to this but I\'m struggling to get my head around it.

I have a habtm relation between Projects and Users. I\'m tryi

Answer 1

From Matt's reply above, which was extremely helpful.

I had trouble with this for a while. I attempted to use the following:

scope :not_belonging_to, lambda {|developer| where('id NOT IN (?)', developer.projects.empty? ? '' : developer.projects) }

But I received the following error:

SQLite3::SQLException: only a single result allowed for a SELECT that is part of an expression:

I found I needed to update the scope, adding .ids on the end. See below:

scope :not_belonging_to, lambda {|developer| where('id NOT IN (?)', developer.projects.empty? ? '' : developer.projects.ids) }