Visualization of date fields as_hidden aren't localized

[César H. Roldán]

When use a date field as_hidden in template, the value isn't localized.

For example, in my settings.py I set:

LANGUAGE_CODE="es_ar"

and when I use:

{{form.field.as_hidden}}

I recieve:

<input type="hidden" name="date_field" value="2012-01-01" id="id_date_field">

and the correct format must be:

<input type="hidden" name="date_field" value="01/01/2012" id="id_date_field">

The Input widget does not use format for those types (see Date, DateTime or Time widgets)

[Aleksandra Sendecka]

The problem here is much deeper. The same behavior is for any field that had to be localized (for example decimal field). It turned out that if we call functions such as as_hidden or as_text on a field, the value will not be localized. The fix is on the Field level: prepare_value method checks if the widget has 'is_localized' set to True and if so, runs formats.localize_input(value).

The patch is here:
​https://github.com/django/django/pull/825

[Claude Paroz]

Note that this is also related to #16612, where changed value detection is not properly handled for localized value. I suggest to commit this one only after #16612 is fixed.

[Tim Graham <timograham@…>]

In 893d8de6f5d0b6bf23e2ed072e18fe2e012395c6:

Fixed #18777 -- Localized form fields with as_text/as_hidden

Thanks croldan for the report.

[Tim Graham <timograham@…>]

In 6e4fd816c48b6ffd06fb7ae2c8ef2009bb0c6c25:

[1.6.x] Fixed #18777 -- Localized form fields with as_text/as_hidden

Thanks croldan for the report.

Backport of 893d8de6f5 from master

[Aymeric Augustin]

This fix triggered a regression: #21074.

[Florian Apolloner <florian@…>]

In 56743cf9e337826e4c615909570bb057142a6a7b:

Ensured that BoundField.as_widget always returns properly localized fields.

This is a follow-up to #18777 which improperly converted to strings in
prepare_value and as such caused regressions like #21074.

Refs #18777, #21074

[Florian Apolloner <florian@…>]

In ece8d6521771635fb5e15d1093524b4f848608fa:

[1.6.x] Ensured that BoundField.as_widget always returns properly localized fields.

This is a follow-up to #18777 which improperly converted to strings in
prepare_value and as such caused regressions like #21074.

Refs #18777, #21074

Backport of 56743cf9e337826e4c615909570bb057142a6a7b from master.