alecguintu · August 29, 2015 14:10 · Dec 2, 2014 · Dec 2, 2014 · Dec 2, 2014
diff --git a/gistfile1.rb b/gistfile1.rb
@@ -1,6 +1,6 @@
 class Shelf < ActiveRecord::Base
   has_many :comics
-  has_many :books
+  has_many :books#, validate: -> {self.shelf_of == 'book'}
 
   accepts_nested_attributes_for :comics
   accepts_nested_attributes_for :books

diff --git a/gistfile1.rb b/gistfile1.rb
@@ -1,12 +1,18 @@
 class Shelf < ActiveRecord::Base
   has_many :comics
+  has_many :books
+
   accepts_nested_attributes_for :comics
+  accepts_nested_attributes_for :books
+
+  # has a dropdown on view for shelf_of that could either be 'comic' or 'book
+  validates :shelf_of, inclusion: { within: %w(comic book) }
 end
 
 class Comic < ActiveRecord::Base
 
 end
 
 class Book < ActiveRecord::Base
-  validates :title, presence: true
+  validates :title, format: { with: /\Asome_complicated_format\z/i }
 end
diff --git a/gistfile1.rb b/gistfile1.rb
@@ -0,0 +1,12 @@
+class Shelf < ActiveRecord::Base
+  has_many :comics
+  accepts_nested_attributes_for :comics
+end
+
+class Comic < ActiveRecord::Base
+
+end
+
+class Book < ActiveRecord::Base
+  validates :title, presence: true
+end
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