[Django] #22290: Forms DateField show_hidden_initial USE_L10N = False and custom DATE_INPUT_FORMATS

[Django]

#22290: Forms DateField show_hidden_initial USE_L10N = False and custom
DATE_INPUT_FORMATS
-------------------------+-------------------------------------------------
     Reporter:           |      Owner:  nobody
  dibrovsd@…             |     Status:  new
         Type:  Bug      |    Version:  1.6
    Component:  Forms    |   Keywords:  DateField USE_L10N hidden_initial
     Severity:  Normal   |  DATE_INPUT_FORMATS
 Triage Stage:           |  Has patch:  1
  Unreviewed             |      UI/UX:  0
Easy pickings:  0        |
-------------------------+-------------------------------------------------
 Hi.

 if settings is:
 - USE_L10N = False
 - DATE_INPUT_FORMATS = ('%d.%m.%Y', '%Y-%m-%d')

 then format in DateInput and HiddenInput (default hidden_widget for
 DateField) is different:
 - DateInput: '01.01.2014'
 - HiddenInput: '2014-01-01'

 Field._has_changed('2014-01-01',  '2014-01-01') always return True in
 form.changed_data

 For default DATE_INPUT_FORMATS, DateInput use '%Y-%m-%d'
 (DATE_INPUT_FORMATS[0] for USE_L10N = False)
 But if DATE_INPUT_FORMATS[0] != '%Y-%m-%d'

 format HiddenInput != format DateInput

 Test case:
 {{{
 from django import forms
 from datetime import date

 class TestForm(forms.Form):
     date_field = forms.DateField(show_hidden_initial=True)

 form = TestForm(initial={'date_field': date.today()})

 print form.as_ul()
 }}}

 Fix:
 # add HiddenDateInput
 class HiddenDateInput(forms.DateInput):
     is_hidden = True
     input_type = 'hidden'

 # set HiddenDateInput for default hidden_widget in DateField
 class DateField(fields.DateField):
     hidden_widget = widgets_custom.HiddenDateInput

-- 
Ticket URL: <https://code.djangoproject.com/ticket/22290>
Django <https://code.djangoproject.com/>
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