For best performances, should I:
records = MyModel.objects.all()
for item in records:
...
or is the following ok:
for item in MyModel.objects.all():
...
?
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Hi
I'm quite new to both django and python, and OOP for that matter. I do have
some embedded programming experience though.
I have a question regarding querysets and dictionaries, I think.
I was trying to build a model that provides an overview for subscribed
customers over their services and s
Without the get(), you get a queryset, which is an iterable of all elements
that match the query - in effect, a list of dicts. Even though only one record
matches, you still get a queryset containing a single dict. So in order to use
that in your template, you'd have to add an outer loop iterati
On Jan 20, 7:09 pm, Olivier Guilyardi wrote:
> For best performances, should I:
>
> records = MyModel.objects.all()
> for item in records:
> ...
>
> or is the following ok:
>
> for item in MyModel.objects.all():
> ...
>
> ?
There is no difference, except for the infinitesimal amount of ti
On 01/20/2010 08:41 PM, Daniel Roseman wrote:
> On Jan 20, 7:09 pm, Olivier Guilyardi wrote:
>> For best performances, should I:
>>
>> records = MyModel.objects.all()
>> for item in records:
>> ...
>>
>> or is the following ok:
>>
>> for item in MyModel.objects.all():
>> ...
>>
>> ?
>
> T
Hi, thanks - that provides some perspective.
So if I omitted the .get() and .values() i will have to loop over the
queryset and then each dict, doing something like:
{% for q in info %}
{% for k, v in q.items %}
{{ k }} {{ v}}
{% empty %}
No. q will be a model instance, not a dict. Your inner loop would,
perhaps, loop over a sequence of names (like the arguments you were passing
to value()) and use those names to access the attributes of q.
This might more cleanly handled with a method on the q object's class that
returns the des
Well, not quite. That will work if you just omit .get(), because then
you'll have a ValuesQuerySet - basically, a list of dicts. However, if you
omit .values() as well you'll have a plain old QuerySet - ie a list of
model instances - and those instances aren't dicts and don't have an
.items() m
Hi
Yeah I see.
I tried it out just after writing, with little success, but without the
.values() I do still have the {{ data.field_name }} available which Is
probably more usefull than actually iterating over a dataset regardless of
content.
Still the relationsships are only available as forward
.get() actually gets you an instance, while the queryset without the get
acts (somewhat) like a list of instances. It is the .values() call that
causes you to have dicts rather than instances. .get() considers it an
error if the queryset represents either zero objects, or two or more
objects (it
Daniel Roseman adviced me to use the Shell. This was a fantastic idea, and
one I should have thought of myself! Anyway this helped me realize that I
was referencing related models the wrong way. For some reason I thought
that you should reference the model name and not the foreign key field
nam
Sorry...I wanted open a new discussion but i reply instead...
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I have a category page that lists all of its subcategories on it.
For each subcategory, I would like to query for one product in that
subcategory.
In PHP, I think I did this in the page, outputting HTML as I went. But
I can't figure out how to do this in Django. My programming brain is
just rusty
is the subcategory the same for all the top level categories?
if so, i think you should be able to query your category queryset,
like this?
finalset =
Category.objects.filter().filter(subcategory__field=)
Unless I'm not understanding.
On Oct 13, 10:52 am, Austin Govella wrote:
> I h
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