Pastable version of Validate the nested model

<pre class='prettyprint' language='ruby'>class Round &lt; ActiveRecord::Base
  belongs_to :season
  has_many :questions, :dependent =&gt; :destroy do
  	def not_valid
  	  self.select do |question|
  	  	!question.valid?
  	  end
  	end
  end
end</pre>
<pre class='prettyprint' language='ruby'>class Question &lt; ActiveRecord::Base

belongs_to :round
  
  validates_presence_of :name
  validates_presence_of :body, :on =&gt; :update
  
end</pre>
<pre class='prettyprint' language='ruby'>class RoundsController &lt; ApplicationController
  def publish
  	@round = @season.rounds.find(params[:id])
  	if @round.valid? &amp;&amp; @round.questions.not_valid.empty? &amp;&amp; @round.update_attribute(:published, true)
  	  flash[:notice] = 'Round was successfully published.'  	  	  
	end
  	redirect_to season_round_path(@round.season, @round)	
  end
end</pre>
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Pastable version of Validate the nested model