【发布时间】：2016-06-16 04:42:18
【问题描述】：
我使用的是 Django 1.9
无论出于何种原因，我都无法让 Django 在我的products 应用程序中为更多模型创建表。添加store 模型并在admin.py 上注册并运行manage.py makemigrations 和manage.py migrate 无数 次后，我尝试添加我得到Operation error: no such table products_store 的实例。
我有以下models.py：
from __future__ import unicode_literals
from django.db import models
# Create your models here.
def image_upload_location(instance, filename):
print instance.name
print filename
return "static/images/products/%s" %(filename)
class Category(models.Model):
title = models.CharField(max_length=120, unique=True)
description = models.TextField(null=True,blank=True)
def __unicode__(self):
return self.title
class Product(models.Model):
name = models.CharField(max_length = 120)
description = models.TextField(blank=True,null=True)
main_image = models.ImageField(upload_to=image_upload_location)
price = models.DecimalField(decimal_places=2, max_digits=20)
available = models.BooleanField(default=True)
categories = models.ManyToManyField('Category', blank=True)
def __unicode__(self):
return self.name
class Store(models.Model):
name = models.CharField(max_length=120)
description = models.TextField(blank=True,null=True)
def __unicode__(self):
return self.name
class Building(models.Model):
name = models.CharField(max_length=30)
class Variant(models.Model):
variant_name = models.CharField(max_length=120)
description = models.TextField(blank=True,null=True)
variant_image = models.ImageField(upload_to=image_upload_location, null=True)
price = models.DecimalField(decimal_places=2,max_digits=20)
available = models.BooleanField(default=True)
product = models.ForeignKey(Product)
store = models.ForeignKey(Store)
def __unicode__(self):
return self.variant_name
然后在shell上，我尝试了以下：
In [1]: from products.models import Store
In [2]: from products.models import Product
In [3]: Store
Out[3]: products.models.Store
In [4]: Product
Out[4]: products.models.Product
In [5]: Store.objects.all()
OperationalError: no such table: products_store
In [8]: Product.objects.all()
Out[8]: []
对我来说真的很奇怪。我还尝试删除所有迁移，然后再次运行所有迁移，但这似乎不起作用。
这是迁移的输出：
Migrations for 'products':
0001_initial.py:
- Create model Category
- Create model Product
- Create model Store
- Create model Variant
A:try3 a$ python manage.py migrate
Operations to perform:
Apply all migrations: sessions, admin, sites, auth, contenttypes, products
Running migrations:
Rendering model states... DONE
Applying sites.0001_initial... OK
Applying sites.0002_alter_domain_unique... OK
更新：
来自manage.py dbshell的输出
SQLite version 3.9.2 2015-11-02 18:31:45
Enter ".help" for usage hints.
sqlite> .tables
auth_group django_migrations
auth_group_permissions django_session
auth_permission django_site
auth_user products_category
auth_user_groups products_product
auth_user_user_permissions products_product_categories
django_admin_log products_variant
django_content_type
`migrations/0001_initial.py 的内容
class Migration(migrations.Migration):
initial = True
dependencies = [
]
operations = [
migrations.CreateModel(
name='Category',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('title', models.CharField(max_length=120, unique=True)),
('description', models.TextField(blank=True, null=True)),
],
),
migrations.CreateModel(
name='Product',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('name', models.CharField(max_length=120)),
('description', models.TextField(blank=True, null=True)),
('main_image', models.ImageField(upload_to=products.models.image_upload_location)),
('price', models.DecimalField(decimal_places=2, max_digits=20)),
('available', models.BooleanField(default=True)),
('categories', models.ManyToManyField(blank=True, to='products.Category')),
],
),
migrations.CreateModel(
name='Store',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('name', models.CharField(max_length=120)),
('description', models.TextField(blank=True, null=True)),
],
),
migrations.CreateModel(
name='Variant',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('variant_name', models.CharField(max_length=120)),
('description', models.TextField(blank=True, null=True)),
('variant_image', models.ImageField(null=True, upload_to=products.models.image_upload_location)),
('price', models.DecimalField(decimal_places=2, max_digits=20)),
('available', models.BooleanField(default=True)),
('product', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='products.Product')),
('store', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='products.Store')),
],
),
]
【问题讨论】：
-
sites/migrations/0001_initial.py的内容是什么？您是否尝试删除所有 *.pyc 文件并重新开始？ -
运行
python manage.py dbshell然后输入.tables会得到什么？ -
@Selcuk 我删除了包含在
products/migrations文件夹中的所有文件，不确定您所说的 *.pyc 是什么意思 -
@ChrisFreeman 查看更新的问题
-
@McLean25 我的意思是编译的 Python 文件，以扩展名 pyc 结尾。也尝试删除
products/models.pyc