如何使用redirect_to 传递变量？

Question

在我的控制器销毁函数中，我想在删除项目后重定向到索引，并且我想在重定向时传递一个名为'checked'的变量：

def destroy
    @Car = Car.find(params[:id])
    checked = params[:checked]

    if @car.delete != nil

    end

    redirect_to cars_path #I would like to pass "checked" with cars_path URL (call index)
end

如何通过 cars_path 传递这个“已检查”变量，以便在我的索引函数中得到它？ （cars_path 调用 index 函数）

def index
 checked = params[checked]
end

Answer 1

如果您不介意在 url 中显示的参数，您可以：

redirect_to cars_path(:checked => params[:checked])

如果你真的介意，你可以通过会话变量：

def destroy
  session[:tmp_checked] = params[:checked]
  redirect_to cars_path
end

def index
  checked = session[:tmp_checked]
  session[:tmp_checked] = nil # THIS IS IMPORTANT. Without this, you still get the last checked value when the user come to the index action directly.
end