Ruby on Rails

On Oct 1, 2010, at 2:19 AM, Bob Smith wrote:
> In my view, I do a
>
> <%= render :partial => 'person', :collection =>
> @household.people.sort_by(&:birthday) %>
>
> household has a has_many relationship with person, and this works fine
> until...
>
> an errant user creates a new person and tries to save without filling
> the fields(day, month, and year). After this the birthday field is
> created and fails horribly. Is there any way to delete blank records
> as part of the validation??
>
>
> Thanks
>
> Bob <bsm2th@gmail.com>

While I'm not contradicting the responses from Michael and pepe, I'm
going to lead you a different way.

First, I'll suggest that you don't have this level of code in your
view. Put a method on your Household model that returns the people in
the proper order. Your view code then becomes:

<%= render :partial => 'person', :collection =>
@household.people_by_birthday %>

(Which in later version of Rails can be
just <%= render @household.people_by_birthday %> )

Second, use one of the methods given by Michael or pepe to keep
persons having invalid (or missing) birthdays from being created.

Finally, as a possible implementation of the #people_by_birthday
method (note that I'm assuming that there's a #name method on which to
sort the persons having no birthday):

class Household
def people_by_birthday
list = self.people.partition {|person| person.birthday.blank?}
list[1].sort_by(&:birthday) + list[0].sort_by(&:name)
end
end

-Rob

Rob Biedenharn
Rob@AgileConsultingLLC.com http://AgileConsultingLLC.com/
rab@GaslightSoftware.com http://GaslightSoftware.com/

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