#18651: Assignment tags should allow optional assignments
---------------------------------+--------------------------------------
Reporter: mitar | Owner: nobody
Type: New feature | Status: reopened
Component: Template system | Version: 1.4
Severity: Normal | Resolution:
Keywords: | Triage Stage: Unreviewed
Has patch: 1 | Needs documentation: 1
Needs tests: 1 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by tim_heap):
After discussing with people in #django-dev, the following was proposed:
* Merge these changes in to `simple_tag`.
* Start `assignment_tag` on the deprecation path.
For example:
{{{
@register.simple_tag()
def plain_output():
"""
Use as `{% plain_output %}`. Prints 'bar'
"""
return 'bar'
@register.simple_tag(assignable=True)
def optional_assignment():
"""
Use as either:
* `{% optional_assignment %}` - prints 'bar'
* `{% optional_assignment as foo %}` - assigns 'bar' to 'foo'
"""
return 'bar'
@register.simple_tag(assignable=True, default_name='foo')
def default_assignment():
"""
Use as either:
* `{% default_assignment %}` - assigns 'bar' to 'foo'
* `{% default_assignment as foo %}` - assigns 'bar' to 'foo'
"""
return 'bar'
}}}
This has the down side of being unable to force assignment, as you
currently can with `assignment_tag`. I do not see this being a problem
though, as I can not think of a reasonable example where outputting a
variable is so harmful that the possibility of it happening should be
guarded against explicitly in the tag. If you really need this case, write
a completely custom tag.
--
Ticket URL: <https://code.djangoproject.com/ticket/18651#comment:5>
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