gistfile1.rb

def create
  @my_model = MyModel.new(params[:my_model])

  respond_to do |format|
    if @my_model.save
      format.html { redirect_to(my_models_path, :notice => 'Success') }
      format.js   { render :json => { :success => true, :message => "Success"}, :content_type => 'text/json' }
      format.xml  { render :xml => @my_model, :status => :created, :location => @my_model }
    else
      format.html { render :action => "new" }
      format.js   { render :json => { :success => false, :message => "Fail"}, :content_type => 'text/json' }
      format.xml  { render :xml => @my_model.errors, :status => :created, :location => @my_model }
    end
  end
end