Proposal: Support the __html__ method as an alternative/addition to the
__str__ for turning objects into strings in the template layer.
If this has been discussed before, please point me to it; I couldn't find
anything with the search function.
Some custom classes may have, in addition to a __str__ representation, a
natural representation that is better suited for HTML output. Example:
class Money:
def __init__(self, amount, currency):
self.amount = amount
self.currency = currency
def __str__(self):
return '%s %s' % (self.currency, self.amount)
def __html__(self):
# Always show amount and currency on same line
return '%s\xa0%s' % (self.currency, self.amount)
`conditional_escape` and friends already consider the __html__ method, and
this works out well:
>>> str(Money(1, '$'))
'$ 1'
>>> conditional_escape(Money(1, '$'))
'$\xa01'
In templates however it doesn't work that way because variables are always
turned into strings before stuffing them into `conditional_escape`
(see
https://github.com/django/django/blob/98706bb35e7de0e445cc336f669919047bf46b75/django/template/base.py#L977).
My suggestion is to change the behaviour of that function so that it works
as follows:
- Given I write {{ foo }}
- Does foo have a __html__ method? If yes, return `foo.__html__()`
- Otherwise, return `conditional_escape(str(foo))`
Do think that's a good idea?
Jonas
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