On Tue, Mar 1, 2011 at 12:19 PM, Masklinn <maskl...@masklinn.net> wrote:
> On 2011-03-01, at 12:11 , Marc Aymerich wrote:
>> On Tue, Mar 1, 2011 at 12:02 PM, Daniel Hilton <daniel.hil...@gmail.com>
>> wrote:
>>> On 1 March 2011 10:55, Marc Aymerich <glicer...@gmail.com> wrote:
>>>> Hi!,
>>>> I have a model class like this one:
>>>>
>>>> class Domain(models.Model):
>>>> active = models.BooleanField()
>>>> root = models.CharField(max_length=6)
>>>>
>>>> now given a Domain instance I need to know if it meets with an
>>>> expresion like this one:
>>>>
>>>> active=True and (root='com' or root='net')
>>>>
>>>> one way to do that is get all domains that meets the expresion
>>>> (formated as queryset) and check if the object is one of them.
>>>> But maybe there is a more direct way to check it?
>>>
>>> You can use filter's with get so:
>>>
>>> Try:
>>> myDomain = Domain.objects.get(active=True, etc...)
>>> except myDomain.DoesNotExist:
>>> myDomain = None
>>>
>>> Kinda like that ish.
>>
>> Hi Dan,
>> Thanks for your answer! Unfortunately I need to do the inverse
>> process, given an object I need to check if it meets with a
>> 'queryset'.
>
> Ah, so something equivalent to jQuery's `.is()` method? What kind of control
> do you have over the expression to test again? is it arbitrary as long as the
> semantics are the right ones or is its syntax already set in stone?
>
Hi Masklinn, I never use jquey's :(
My idea is that the end user can define their own arbitrary expression
in order to match a subset of objects from a particular class. For
example this is the class that handle the expression.
class Service(models.Model):
content_type = models.ForeignKey(ContentType)
expression = models.CharField(max_length=255)
price = models.PositiveIntegerField()
So, with this class the admin of my application can say: Active .ORG
domains costs 10€ , active .ES and .NET domains costs 25€ ...
--
Marc
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