#11687: The 'add' template filter only works for integers, and can fail noisily
---------------------------------------------+------------------------------
Reporter: thepointer | Owner: gruszczy
Status: new | Milestone: 1.2
Component: Template system | Version: 1.1
Resolution: | Keywords:
Stage: Design decision needed | Has_patch: 1
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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Comment (by gruszczy):
I don't like sucking all exceptions and this shouldn't be done. Imagine
there is a custom object, that can be cast to an int and during coercing
it will raise a different exception. Why should user lose this
information? This is completely contrary to python zen.
When it comes to ducktyping, you have to remember, that the object on
which filter is used, will have to able to accept a string as an argument
of __add__. Most basic types:
{{{
In [1]: [] + ''
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/gruszczy/<ipython console> in <module>()
TypeError: can only concatenate list (not "str") to list
In [2]: () + ''
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/gruszczy/<ipython console> in <module>()
TypeError: can only concatenate tuple (not "str") to tuple
}}}
just can't do this.
--
Ticket URL: <http://code.djangoproject.com/ticket/11687#comment:11>
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