Where to put rescue clause

I have a unique index constraint that throws an
ActiveRecord::StatementInvalid exception when triggered. In my
application this causes a stack trace in the client browser. I want to
rescue this error and handle it inside the controller, but I cannot seem
to.

Here is the controller code:

  def create
    @entity = Entity.new(params[:entity])
    ...
    respond_to do |format|
      if @entity.save
        flash[:notice] = 'Client was successfully created.'
        format.html { redirect_to(@client) }
        format.xml { render :xml => @client,
          :status => :created, :location => @client }
      else
        format.html { render :action => "new" }
        format.xml { render :xml => @client.errors,
          :status => :unprocessable_entity }
      end
    end
  rescue => my_exception
    puts "Rescue clause invoked!"
    puts my_exception
  end

For now, all I want is to see the rescue clause invoked, but it is not.
have I put this clause in the wrong place? Am I specifying it wrong?

James Byrne wrote:

  rescue => my_exception

Try this:

rescue Exception => e