Opened 9 years ago

Closed 5 years ago

#6272 closed New feature (wontfix)

django.utils.translation.ugettext_lazy needs __add__ support

Reported by: Tai Lee <real.human@…> Owned by: nobody
Component: Core (Other) Version: master
Severity: Normal Keywords: ugettext_lazy unicode concatenate
Cc: real.human@… Triage Stage: Design decision needed
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description (last modified by Ramiro Morales)

The model fields defined in django.contrib.auth.models (and I assume other parts of django) use django.utils.translation.ugettext_lazy to specify the label (or another property from which the label is derived). The form field objects generated by form_for_* and ModelForm on these models return a django.utils.functional.__proxy__ object instead of a unicode object where ugettex_lazy is not used.

I have a few helper template tags which are trying to alter the form field label with a concatenation, which is throwing an error for form_for_model and ModelForm forms for django.contrib.auth.models.User (and other django/contrib models that use ugettext_lazy).

As the documentation doesn't recommend or require the use of ugettext_lazy in it's examples and tutorials when defining models and forms, this inconsistent behaviour seems less than ideal. If django.utils.functional.__proxy__ could be changed with an __add__ (and other?) methods to behave more like a string/unicode object, that would be good?

Change History (5)

comment:1 Changed 9 years ago by Simon Greenhill <dev@…>

Triage Stage: UnreviewedDesign decision needed

comment:2 Changed 8 years ago by Ramiro Morales

Description: modified (diff)

comment:3 in reply to:  description Changed 8 years ago by Ramiro Morales

Replying to Tai Lee <>:

As the documentation doesn't recommend or require the use of ugettext_lazy in it's examples and tutorials when defining models and forms

This is true, but for the case of models, this is suggested in the I18N docs: and further down there is a section devoted to working with this kind of objects (and it included using them in combination with string/unicode objects):

comment:4 Changed 6 years ago by Julien Phalip

Severity: Normal
Type: New feature

comment:5 Changed 5 years ago by Carl Meyer

Easy pickings: unset
Resolution: wontfix
Status: newclosed
UI/UX: unset

Many magic methods aren't supported by lazy proxies - the solution is if you have something that might be a lazy proxy, coerce it to what you need so you know what you're dealing with. "Blah" + unicode(foo) is not significantly more onerous than "Blah" + foo.

(Also, it appears that foo + "blah", where foo is a lazy proxy, works fine. It's the other direction that doesn't seem to work, so it's really __radd__ that would be needed.)

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