Я использую Factory Boy в своем проекте Django. Не могли бы вы объяснить мне мою ошибку: почему у меня возникает ошибка при запуске 'tests.py' - 'ValueError: "" должно иметь значение для поля "post", прежде чем можно будет использовать это отношение "многие ко многим" .'
Вот мой код:
import factory
from . import models
# factories
class TagFactory(factory.Factory):
class Meta:
model = models.Tag
name = factory.Sequence(lambda n: 'tag-%s' % n)
slug = factory.Sequence(lambda n: 'slug-%s' % n)
class CategoryFactory(factory.Factory):
class Meta:
model = models.Category
name = factory.Sequence(lambda n: 'cat-%s' % n)
slug = factory.Sequence(lambda n: 'cat-slug-%s' % n)
class PostFactory(factory.Factory):
class Meta:
model = models.Post
title = factory.Sequence(lambda n: 'postik-%s' % n)
text = 'some text'
slug = factory.Sequence(lambda n: 'post_slug_%s' % n)
category = factory.SubFactory(CategoryFactory)
@factory.post_generation
def tags(self, create, extracted, **kwargs):
if not create:
# Simple build, do nothing.
return
if extracted:
for tag in extracted:
self.tags.add(tag)
тесты.py
from django.test import TestCase
from . import factories
from .models import Post, Category, Tag
from django.core.urlresolvers import reverse
class PostTests(TestCase):
"""
display_post view test.
"""
def setUp(self):
self.tag = factories.TagFactory()
self.category = factories.CategoryFactory()
self.poster = factories.PostFactory.create(tags=('tag-1'))
...
модели.py
from django.db import models
from django.core.urlresolvers import reverse
from django.utils import timezone
from django.utils.translation import ugettext_lazy as _
from ckeditor.fields import RichTextField
class Category(models.Model):
"""
Category.
"""
name = models.CharField(max_length=20)
slug = models.SlugField(max_length=20)
def __str__(self):
return self.name
def get_absolute_url(self):
return reverse('categorier', args=[str(self.slug)])
class Tag(models.Model):
"""
Tag.
"""
name = models.CharField(max_length=100, unique=True)
slug = models.SlugField(max_length=100, unique=True)
def __str__(self):
return self.name
def get_absolute_url(self):
return reverse('tagger', args=[str(self.slug)])
class Meta:
verbose_name = _('Tag')
class Post(models.Model):
"""
Post model.
"""
title = models.CharField(max_length=150)
created_date = models.DateTimeField(auto_now_add=True)
image = models.ImageField(upload_to="pictures/%Y/%m/%d",
blank=True, null=True)
text = RichTextField(max_length=10000)
slug = models.SlugField(max_length=150, unique=True)
tags = models.ManyToManyField(Tag, null=True, blank=True)
category = models.ForeignKey(Category)
def __str__(self):
return self.title
def get_absolute_url(self):
return reverse('poster', args=[str(self.slug)])
class Meta:
ordering = ['-created_date']
verbose_name = _('Eco Post')
verbose_name_plural = _('Eco Posts')
Проследить:
ERROR: test_display_post (posts.tests.PostTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/Users/boshepelinski/Documents/Projects/Django/ecohata/ecohata/posts/tests.py", line 17, in setUp
self.poster = factories.PostFactory.create(tags=('tag-1'))
File "/Users/boshepelinski/Documents/Projects/Django/ecohata/lib/python3.4/site-packages/factory/base.py", line 585, in create
return cls._generate(True, attrs)
File "/Users/boshepelinski/Documents/Projects/Django/ecohata/lib/python3.4/site-packages/factory/base.py", line 516, in _generate
results[name] = decl.call(obj, create, extraction_context)
File "/Users/boshepelinski/Documents/Projects/Django/ecohata/lib/python3.4/site-packages/factory/declarations.py", line 490, in call
extraction_context.value, **extraction_context.extra)
File "/Users/boshepelinski/Documents/Projects/Django/ecohata/ecohata/posts/factories.py", line 41, in tags
self.tags.add(tag)
File "/Users/boshepelinski/Documents/Projects/Django/ecohata/lib/python3.4/site-packages/django/db/models/fields/related.py", line 1175, in __get__
through=self.field.rel.through,
File "/Users/boshepelinski/Documents/Projects/Django/ecohata/lib/python3.4/site-packages/django/db/models/fields/related.py", line 831, in __init__
(instance, source_field_name))
ValueError: "<Post: postik-0>" needs to have a value for field "post" before this many-to-many relationship can be used.
