title: Rails 4.0 param is missing or the value is empty
body: <p>I have an Opportunity model that has a nested resource Link. In my views/opportunities/show page when I click on "DestroY' for one of the links, I get the error:</p>
  
  <p>param is missing or the value is empty: link</p>
  
  <p>The code snippet it is complaining about is:</p>
  
  <pre><code>def link_params
       params.require(:link).permit(:description, :link_url)
  end
  </code></pre>
  
  <p>Here is my destroy code:</p>
  
  <pre><code>def destroy
    @opportunity = Opportunity.find(params[:opportunity_id])
    @link = @opportunity.links.find(link_params)
    @link.destroy
    respond_to do |format|
      format.html { redirect_to links_url, notice: 'Link was successfully destroyed.' }
      format.json { head :no_content }
  end
  </code></pre>