Re: eval if an object meets with a queryset.

On Tue, Mar 1, 2011 at 12:19 PM, Masklinn <masklinn@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.hilton@gmail.com> wrote:
>>> On 1 March 2011 10:55, Marc Aymerich <glicerinu@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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