Hi everyone,
We are developing a webapp using Django. We have found a problem with
m2m relations.
I will Expose a simplified example of the problem; say we have 2 classes:
class A(models.Model):
name = models.CharField(max_length = 128, default="", blank =
True, null=True, verbose_name = "Interface Name")
def setName(self,value)
#Do fancy validation
self.name = value
self.save()
class B(models.Model):
multipleAs = models.ManyToManyField('A', blank = True, null =
False, editable = False)
def modifyAnA(self,myName,newValue):
#let's modify
instance=self.multipleAs.get(name=myName)
instance.setName(newValue)
With this code, the instance that was in the class B's m2m relation is
missing, once I execute the setName method in the instance (instance is
correctly modified in table of class A) (?¿). In addition, if I do the
following:
def modifyAnA(self,myName,newValue):
#let's modify
instance=self.multipleAs.get(name=myName)
#instance.setName(newValue)
instance.name = newValue
instance.save()
Works perfectly, and the instance is already there. In addition, I am
not using transactions for the moment.
Am I missing something trivial here? A bug? Is Django supposed to behave
this way?
Although I know I will not be able to force the usage of the setters, we
"must"use them since we don't want to be spreading around data
validations outside the class (since are quite big, and not very beautiful).
Thank you in advance
B regards
Marc
p.s. By the way, working with stable Debian Squeeze 32 Django version, I
belive version "Package: python-django (1.3-2)"
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Marc Suñé Clos
Network Technologies Cluster (CTX)
i2CAT Foundation
C/ Gran Capità 2-4, office 203, Nexus I building
08034 Barcelona, Catalonia (Spain)
T: +34 93 567 9926
F: +34 93 553 2520
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