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#35: validating date_select in rails

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on April 15, 2009, 11:39 PM UTC   —   from   148c663fd665c53518538e093ce3c2ab_small kueda    ( 593 views )
If you use the date_select helper in Rails, setting all fields except for the year will result in MultiparameterAssignmentErrors. You can catch the exception, but it's kind of hard to catch it in a place where you can add errors to a model instance.
Tags: ruby validation hacks sadness Rails
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override assign_multiparameter_attributes

2

- 148c663fd665c53518538e093ce3c2ab_small kueda on April 15, 2009, 11:41 PM UTC

I ended up overriding assign_multiparameter_attributes to look for empty fields. Obviously, this will break non-date multiparam assignments, but I'm hoping that will be ok in my case.

In my model:

   1  
   2    def assign_multiparameter_attributes(pairs)
   3      pair_values = Hash[pairs].values
   4      if pair_values.collect(&:blank?).include?(true) && 
   5        pair_values.collect(&:blank?).uniq.include?(false)
   6        @incomplete_date = true
   7      else
   8        super(pairs)
   9      end
  10    end
  11    
  12    def validate
  13      if @incomplete_date
  14        self.errors.add_to_base("The date you entered is incomplete!")
  15      end
  16    end
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References

http://giantrobots.thoughtbot.com/2007/5/29/ruby-on-fails - found by 148c663fd665c53518538e093ce3c2ab_small kueda on April 15, 2009, 11:42 PM UTC

Lists the many ways you could approach the problem. My solution was derived from some of the comments. Note that he ended up just not using date_select. Probably the better solution.