Question

I have a requirement to display duration as HH:MM in Rails as two select boxes one for hours and other for minutes. Restrict the hours to max of 4:00. duration (column type:integer) is stored as minutes in database. And I am using formtastic.

如果我不时地投入,我就能够随着HHH:MM的下降而获得产出格式。

"<%= f.input :duration, :label => Duration , :as=>:time, :minute_step => 15, :hint=>"Measured in hours", :end => 10 %>"

我如何限制甄选所显示的时间(只有1、02、03、04小时在下降数小时时)?

请允许我知道,是否为铁路/铁路规定了任何选择。或者,处理这种情形的方法是否更好?

Answer 1

我看不出任何通过形式限制这种选择。你们只能作为选择展示投入,并通过你们想要的选择。

<%= f.input :hours, :as=>:select, :collection => (0..4) %>
<%= f.input :minutes, :as=>:select, :collection => [0,15,30,45] %>

然后,你很可能需要在模型中增加这些虚拟特征:

before_save :set_duration

def set_duration
  self.duration = @hours * 60 + @minutes
end

def hours
  self.duration / 60;
end

def minutes
  self.duration % 60;
end

def hours=(h)
  @hours = h
end

def minutes=(m)
 @minutes = m
end

def duration=(d)
  @hours = d / 60
  @minutes = d % 60
  self.set_duration
end

您不妨查看。回答: 让他们更多地看一看原件。

There might be some clever, quicker way to do this, but this is the first thing that comes to mind.

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