Hi,
I am new to Django and Python and have been working through the
tutorial. I would like to modify the polls app in the tutorial such
that I can track individual users who vote in a poll, keep a record of
their choice, and not allow any user to vote more than once in any
given poll.
Briefly, there are many polls, each poll being linked to several
choices. Each user can vote in many polls, but is allowed to vote
only once in each individual poll. Whats the best way to enforce
this?
I tried to enforce this by using the unique_together feature to bind a
specific user, poll, choice combination together (within the Choice
class). It didnt work. Here is the code I tried:
from django.db import models
import datetime
class User(models.Model):
name = models.CharField(max_length=100)
email = models.EmailField()
def __unicode__(self):
return self.name
class Poll(models.Model):
question = models.CharField(max_length=200)
pub_date = models.DateTimeField('date published')
def __unicode__(self):
return self.question
class Choice(models.Model):
poll = models.ForeignKey(Poll)
user = models.ManyToManyField(User)
choice = models.CharField(max_length=200)
votes = models.IntegerField()
def __unicode__(self):
return self.choice
class Meta:
unique_together = ("poll", "user", "choice")
My error message:
Error: One or more models did not validate:
polls.choice: "unique_together" refers to user. ManyToManyFields are
not supported in unique_together.
polls.choice: "unique_together" refers to user. This is not in the
same model as the unique_together statement.
I would appreciate any suggestions/corrections,
Thanks,
Meenakshi
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