Rails: Each loop that only shows unique associated records

Question

I have an situation where I want to show an each loop of 'updates'. Each update had a game associated with it (game_id). Some times there are updates that have the same game as other updates. How do I modify the loop so that it only shows unique updates? (in the example code below, I don't want to show the same game thumbnail twice)

In the view:

  <% current_user.updates.each do |update| %>

     <img src="<%= update.game.thumbnail %>" />

  <% end %>

In the updates model

belongs_to :user

belongs_to :game

In the game model

has_many :users

has_many :updates

In the user model

has_many :updates

trh trh · Accepted Answer · 2013-10-18T01:21:22

There are probably a half a dozen ways to do this. I would probably use a scope on the update model something like:

scope :most_recent, group(:game_id).order('created_at ASC')

This will give you the most recent entry by date for each game id.

Then in your view

<% current_user.updates.most_recent.each do |update| %>

Rails: Each loop that only shows unique associated records

2 Answers