On 02/27/2013 05:34 PM, Wim Feijen wrote:
Hi all,
We struggled to get a proper definition for a first() and last()
method vs. earliest() and latest() . I'd like to make one proposal.
After that, I really like your opinion on which syntax you prefer.
First, let me give you a lenghty introduction. We discussed several
use cases on this mailing list
<https://groups.google.com/forum/?fromgroups=#%21searchin/django-developers/get_default/django-developers/3RwDxWKPZ_A/mPtAlQ2b0DwJ>.
Then, I realized that:
.filter(last_name__startswith='b').order_by('last_name').first()
is an acceptable compromise for me to use in stead of:
.first(last_name__startswith='b').order_by('last_name')
Last weekend Aymeric explained to me that earliest can actually
accomplish the same:
.filter(last_name__startswith='b').earliest('last_name')
Then, I find "earliest" an inappropriate name, because it does not
describe functioning well.
Therefore, my proposal is, if we are going to implement the earliest
and latest method, we should definitely rename them to: first and latest.
After that, there is only one question left:
Which style do you prefer?
.filter(last_name__startswith='b').order_by('last_name').first() #
clear and long
.first(last_name__startswith='b').order_by('last_name') # first
method has filter syntax.
.filter(last_name__startswith='b').first('last_name') # first method
has order_by syntax.
So, what do you think?
Best regards,
Wim
How about first as a function? I think it's very often useful not just
for querysets but
for all kind of iterables:
def first(iterable, default=None):
try:
return next(iter(iterable))
except StopIteration:
return default
-ak
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