12.4.2012 15:09, Thomas Guettler kirjoitti:
Hi,
sometimes it happens, that db queries get executed at import time
(during importing the file by the interpreter).
That's waste of time a resources.
Is there a way to test how many queries get executing during import? I
want some automated way to detect these db queries.
Example:
def mychoices():
for obj in MyModel.objects.all(): # this hits the db during import.
That's not good.
....
class MyForm(forms.Form):
foo=forms.ChoiceField(choices=mychoices())
That is because you pass parameter as a function call, so of course
function must be evaluated. So in your code reads:
Declare class attribute "foo" as a new instance of "forms.ChoiceField"
with parameter of "choices" with values returned from "mychoices".
So to get rid of that part, you can pass method or a function as a
parameter and it will be evaluated at the runtime:
class MyForm(forms.Form):
foo=forms.ChoiceField(choices=mychoices)
--
Jani Tiainen
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