SemperEadem

  <% categories.each do |category| %>
    <% card_ids = [] %>
    <% cards = Card.joins(:card_types).where(card_types: {id: category.card_type_ids}) %>
    <% cards.find_each do |card| %>
      <% card_ids << card.id unless card_ids.include?(card.id) %>
    <% end %>
    <% category_cards = @main_cards.where(card_id: [card_ids]) %>
  <% end %>

SemperEadem

Card has many Card Types through a join table
Deck has many Cards through a join table

Category has many Card Types

SemperEadem

/Library/Ruby/Gems/2.0.0/gems/activerecord-4.0.3/lib/active_record/dynamic_matchers.rb:22:in `method_missing': undefined method `devise' for #<Class:0x007fb2ec5830d0> (NoMethodError)
	from /Users/Nicolas/EspaceMagic/app/models/user.rb:22:in `<class:User>'
	from /Users/Nicolas/EspaceMagic/app/models/user.rb:1:in `<top (required)>'

SemperEadem

Process:         AdobeCrashDaemon [40344]
Path:            /Applications/Adobe Photoshop CC/Adobe Photoshop CC.app/Contents/Frameworks/AdobeCrashReporter.framework/Required/AdobeCrashDaemon.app/Contents/MacOS/AdobeCrashDaemon
Identifier:      AdobeCrashDaemon
Version:         7.0.1
Code Type:       X86-64 (Native)
Parent Process:  launchd [1]
Responsible:     AdobeCrashDaemon [40344]
User ID:         501

Date/Time:       2014-05-25 18:33:45.844 +0200