Question

Below is a relationship between Comments and a user. Each comment has one user so I’m building out a join in the code below.

I was wondering how to build this code to only include specific columns in the join. I don’t need all of the user information. Just the first_name. Any suggestions.

Current Code:

@comments = Comment.where(:study_id => @study.id).joins(:user)

Answer 1

You could use something like this:

@comments = Comment.joins(:user)
                   .select("comments.*, users.first_name")
                   .where(study_id: @study.id)