How to return an empty ActiveRecord relation?
If I have a scope with a lambda and it takes an argument, depending on the value of the argument, I might know that there will not be any matches, but I still want to return a relation, not an empty array: scope :for_users, lambda { |users| users.any? ? where("user_id IN (?)", users.map(&:id).join(',')) : [] } What I really want is a "none" method, the opposite of "all", that returns a relation th
Many-to-many relationship with the same model in rails?
There are several kinds of many-to-many relationships; you have to ask yourself the following questions: Do I want to store additional information with the association? (Additional fields in the join table.) Do the associations need to be implicitly bi-directional? (If post A is connected to post B, then post B is also connected to post A.) That leaves four different possibilities. I'll walk over
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