Rails，从控制器调用模型方法

Question

A little new to Rails, but simply, I have a model method that calculates the date difference:

def days_diff
  (end_date.to_date - start_date.to_date).to_i + 1
end

I want to be able to use this value/method in my controller to loop a form field x number of times. How do I about calling this method from the controller to use this variable?

Thanks in advance!

Answer 1

Say your model is named ModelName. In your controller method you would have:

def controller_method
  @model_name = ModelName.find(params[:id]) # or however you obtain your model
  x = @model_name.days_diff
  x.times do |index|
    # call your loop stuff here
  end
end

Answer 2

Try defining the method in your model as

self.days_diff 

and then call it in the controller as

model_name.days_diff