Question

I created a Ruby on Rails application (2.3.9) where users can record workouts. I am trying to implement a ‘star’ system which would allow a logged_in user to star workouts from other users that they want to remember.

I am doing this by creating a Star resource (associations below). I am successfully creating a deleting records in my Star table and now want to conditionally display view code based on if a current_user has already starred a workout.

I am displaying all workouts through a partial for _workouts.html.erb. For each workout, I would like to either display the <% remote_form_for [workout, Star.new]... or You have already starred this workout.

Workout :has_many => :stars

User :has_many => :stars

Star :belongs_to => :workouts
Star :belongs_to => :users

I imagine I will have to create a named_scope in Star.rb that looks to see if if there is an existing star record where the workout_id matches workout.id and where current_user.id matches the star.user_id match for that workout. It confuses me just typing this. Please help.

Answer 1

You can create a has_many ..., :through => ... relationship, and then use #include? to check for an association.

# User
has_many :starred_workouts, :class_name => 'Workout', :through => :stars

# View
<% if current_user.starred_workouts.include? workout %>
    ...