First or limit in Rails scope

Question

I have the following scope:

scope :user_reviews, lambda { |user| where(:user_id => user) }

I apply this in the controller:

def show
  @review = @reviewable.reviews.user_reviews(current_user).first || Review.new
end

The first is to limit to search the current user's one and only review. Now I try to write a new scope user_review which I tried many ways to chain the user_reviews scope with first, but just couldn't get it what. Something like this:

scope :user_reviews, lambda { |user| where(:user_id => user) }
scope :user_review, lambda { |user| user_reviews(user).first }

I know the above user_review is wrong, but just trying to show you guys what I am trying to do.

How should I write this properly?

Thanks.

Answer 1

@Victor, just stick with your original idea. Use scope :user_reviews, lambda { |user| where(:user_id => user) } and call user_reviews.first. Nothing wrong with that.

Definitely do not define a scope that returns a single object. A scope should be chainable.