Django error 'unicode' object has no attribute 'objects'

问题:

I'm writing my first django app from https://docs.djangoproject.com/en/dev/intro/tutorial01/ and i'm experiencing 2 problems.

My Models.py are

from django.db import models

class Poll(models.Model):     question = models.CharField(max_length=200)     pub_date = models.DateTimeField('date published')     def _unicode_(self):         return self.question self.question                                                                                                                                                    class Choice(models.Model):     poll = models.ForeignKey(Poll)     choice_text = models.CharField(max_length=200)     votes = models.IntegerField(default=0)      def _unicode_(self):         return self.question  

My First Error is when I do

 python manage.py shell  from mysite.myapp.models import Poll,Choice  p = Poll(question="What Your Name",pub_date"1990-02-04")  p.save()  Poll.objects.all()  [<Poll: Poll object>, <Poll: Poll object>] 

Why Doesn't it show { Poll: What's up? } instead

 [<Poll: Poll object>, <Poll: Poll object>] 

My second question is when i type

 p = Poll.objects.get(id=1)  p.question.objects.all() 

I get this errror

 AttributeError: 'unicode' object has no attribute 'objects' 

how do i fix it?

回答1:

1. you must define your __unicode__ method of your model, not _unicode_.In addition, the code you given return self.question self.question is syntax invalid.

2. p is a poll instance, p.question is CharField not ForeignKey, has no attribute objects. p has objects, call p.objects.all() works well.

回答2:

1> its __unicode__ not _unicode_

Poll(models.Model):     question = models.CharField(max_length=200)     pub_date = models.DateTimeField('date published')     def __unicode__(self):         return self.question, self.pub_date  class Choice(models.Model):     poll = models.ForeignKey(Poll)     choice_text = models.CharField(max_length=200)     votes = models.IntegerField(default=0)     def __unicode__(self):         return self.choice_text 

2> objects function is a property of a document instance not a field, p.questions is a document field,

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