Rails - Jul 2011 - help with a NoMethodError caused by comparing start and end dates

I have a "job" model for adding job experiences to a resume and am
seeing the following error on occasion:

NoMethodError: undefined method `>'' for nil:NilClass

The line of code throwing the error is:       if self.started_on >
self.ended_on


The code for this portion of the job form view is:
  <label>Date started *</label>
    Start: <%= f.date_select :started_on, :order =>
[:month, :year], :start_year=>1970, :include_blank=>true %>
  <br/>
  <label>Date ended *</label>
    Stop: <%= f.date_select :ended_on,  :order =>
[:month, :year], :start_year=>1970, :include_blank=>true %>
  <br>
  Hint: leave blank for current position


The relevant code from the job model is:
  def validate
    unless self.ended_on.nil?
      if self.started_on > self.ended_on
      errors.add_to_base( "Start date is after end date. Please check
your dates." )
      end
    end
  end


In the form, it tells the user to select a start date and end date,
but to leave the end date blank if they are still employed at that
job. I am not certain why this is generating an error sometimes but
not others, other than some combination of selecting the start and
stop dates in an unexpected way.

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On 27 July 2011 03:38, sol.manager
<sol.manager-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> I have a "job" model for adding job experiences to a resume and
am
> seeing the following error on occasion:
>
> NoMethodError: undefined method `>'' for nil:NilClass
>
> The line of code throwing the error is:       if self.started_on >
> self.ended_on
That means started_on is nil.
>
>
> The code for this portion of the job form view is:
>  <label>Date started *</label>
>    Start: <%= f.date_select :started_on, :order =>
> [:month, :year], :start_year=>1970, :include_blank=>true %>
>  <br/>
>  <label>Date ended *</label>
>    Stop: <%= f.date_select :ended_on,  :order =>
> [:month, :year], :start_year=>1970, :include_blank=>true %>
>  <br>
>  Hint: leave blank for current position
>
>
> The relevant code from the job model is:
>  def validate
>    unless self.ended_on.nil?
>      if self.started_on > self.ended_on
I guess you have the situation where ended_on is not nil but
started_on is.  If you don''t think this should be happening then have
a look at the Rails Guide on debugging to find out how to use
ruby-debug to break into the code and inspect data.


Colin

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