On 24.02.2012, at 23:38, David M wrote:
> How can I validate a date that is set with select boxes on the form, so I can
> raise an error when it's invalid?
>
> The default behavior when an invalid date is entered is to add days to arrive
> to a valid date. For example: if 2012-31-06 is sent to the controller, the
> resulting date will be 2012-01-07
>
> How can I stop this behavior and raise an error?
>
> I'm using the date_select(object_name, method, options = {}, html_options =
> {})method in the view.
>
Interesting question.
In the case when date_select helper used, it automatically generates parameter
keys:
'date(1i)' - year
'date(2i)' - month
'date(3i)' - day
When ActiveRecord model receives these parameters, Date object will be
generated and assigned to a corresponding model's attribute. In this process,
there is its clever logic: when values of these parameters aren't clearly
'crazy', Date object will be generated correctly without attention to the minor
errors in the number of days (28, 30 or 31) without any validation errors.
To avoid this integrated logic you can put down your own model's accessors for
'date(1i)', 'date(2i)', 'date(3i)' mass-assignment parameters and appropriate
custom validator. Or you can hack ActiveRecord::MultiparameterAssignment stack
to escape its logic. Both are unaesthetic, unclean approaches from all points
of view.
Instead of 'date_select', you can use 'select_date' (render just the tag), in
this case date parameters will be named as you want. Just write the accessors
and attribute assignment logic, then put the custom validator and this is it.
As for me, I completely gave up date_helper and other selectors, and began to
use strings for dates in a form, adding to their Jquery Date selector plugin.
Much more convenient and simpler.
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