Question

I have a Rails application, I have the following DB schema:
each User has many Members and each Member has many Tags.
The link between the tables is direct (Members table has a user_id column and Tags has a member_id column).

What is the most efficient way to count the number of Tags associated with the user?
Is it through Rails and activerecord or pure sql?

Any thoughts/examples?

Answer 1

In your Tag model you can add a scope:

scope :count_by_user, lambda { |user|
members.where(“members.user_id >= ?”, user)
}

How about that? Do you have the members function/relationship in your Tag model?