Re: django - adding a counter for every ManyToMany field added

Would this not work : 

count = i.objects.filter(activities=Activity).count()

Where you would put the count in a for loop for the Activity and iterate over it. 

V.

On Wed, Nov 14, 2012 at 5:05 AM, Nikolas Stevenson-Molnar <nik.molnar@consbio.org> wrote:

I'm not sure I understand. Do you want the value of the "count" field in the Activity model? In that case, you could use values:

activity_counts = i.activities.all().values('id', 'count') #Will give you something like [{'id': 1, 'count': 3}, {'id': 2, 'count': 5}, ...]

_Nik

On 11/13/2012 3:09 PM, luke lukes wrote:

Hi. I don't need a total counter for all related activities. I need a counter for each related Activity:
Invoice instance:
            activity A -> counter: 3
            activity B -> counter: 5
            ...
            ...

is this possible?
thanks,
Luke


Il giorno martedì 13 novembre 2012 23:25:28 UTC+1, Nikolas Stevenson-Molnar ha scritto:

With an Invoice instance, you can easily get the number of related Activity objects:

i = Invoice.objects.get(pk=1)
num_activities = i.activities.all().count()

_Nik

On 11/13/2012 12:49 PM, luke lukes wrote:

Hi everyone. hi have these models:

      #models.py

class Subject(models.Model):

name = models.CharField("Name",max_length=50, blank=True)

...

...

class Activity(models.Model):

label = models.CharField("Act. name",max_length=150)

price = models.DecimalField("price", max_digits=10, decimal_places=2,default=0)

count = models.IntegerField("Count", default=0)

def __unicode__(self):

   return u"%s" % (self.label)

class Meta:

   verbose_name_plural = "Activities"

class Invoice(models.Model):

subject = models.ForeignKey(Subject)

date = models.DateField(default=date.today())

activities = models.ManyToManyField(Activity)

....

....

while creating a new Invoice instance on admin, i can select the many to many fields 'activities', but i'd like to have an additional counter (eg. an IntegerField) as an Invoice field to count and save the quantity of each activity added to my Invoice instance. Is this possible?

I mean: for each 'Activity' added to an Invoice instance, i need to count the amount of that activity.

thanks,

LuKe

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