更改 Django 1.8 表后无法进行迁移
[英]Unable to make migrations after changes in table for django 1.8
问题描述
我在模型中添加了一个字段“名称”
然后我跑了 make migrations
然后迁移，但它仍然没有检测到最近的更改，而是检测到旧的更改，然后当我运行迁移时，它说表已经存在为什么会这样？
这是模型.py
class Category(MPTTModel):
name = models.CharField(max_length =120 , null=True , blank=True)
title = models.CharField(max_length =120)
parent = models.ForeignKey('self' , null = True , blank = True , verbose_name='parent category', related_name='categories')
description = models.TextField(null=True , blank=True)
active = models.BooleanField(default=True)
slug = models.SlugField(blank=True , unique=True)
timestamp = models.DateTimeField(auto_now_add=True,auto_now=False)
def get_absolute_url(self):
return reverse('categories', kwargs={'path': self.get_path()})
这是迁移文件
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.db import models, migrations
from django.conf import settings
import products.models
class Migration(migrations.Migration):
dependencies = [
migrations.swappable_dependency(settings.AUTH_USER_MODEL),
]
operations = [
migrations.CreateModel(
name='Attribute',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('option', models.CharField(max_length=100, choices=[(b'color', b'color'), (b'size', b'size'), (b'Type', b'Type'), (b'Style', b'Style'), (b'sleeves', b'sleeves')])),
('value', models.CharField(max_length=100)),
],
),
migrations.CreateModel(
name='Brand',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('title', models.CharField(default=b'', max_length=50)),
('slug', models.SlugField(unique=True, blank=True)),
('active', models.BooleanField(default=True)),
('lft', models.PositiveIntegerField(editable=False, db_index=True)),
('rght', models.PositiveIntegerField(editable=False, db_index=True)),
('tree_id', models.PositiveIntegerField(editable=False, db_index=True)),
('level', models.PositiveIntegerField(editable=False, db_index=True)),
('parent', models.ForeignKey(blank=True, to='products.Brand', null=True)),
],
options={
'abstract': False,
},
),
migrations.CreateModel(
name='BrandImage',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('is_slider', models.BooleanField(default=False)),
('is_featured', models.BooleanField(default=False)),
('is_logo', models.BooleanField(default=False)),
('active', models.BooleanField(default=True)),
('image', models.ImageField(upload_to=products.models.brand_upload_to)),
('brand', models.ForeignKey(related_name='brandimages', to='products.Brand')),
],
),
migrations.CreateModel(
name='Category',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('name', models.CharField(max_length=120, null=True, blank=True)),
('title', models.CharField(max_length=120)),
('description', models.TextField(null=True, blank=True)),
('active', models.BooleanField(default=True)),
('slug', models.SlugField(unique=True, blank=True)),
('timestamp', models.DateTimeField(auto_now_add=True)),
('lft', models.PositiveIntegerField(editable=False, db_index=True)),
('rght', models.PositiveIntegerField(editable=False, db_index=True)),
('tree_id', models.PositiveIntegerField(editable=False, db_index=True)),
('level', models.PositiveIntegerField(editable=False, db_index=True)),
('parent', models.ForeignKey(related_name='categories', verbose_name=b'parent category', blank=True, to='products.Category', null=True)),
],
options={
'abstract': False,
},
),
migrations.CreateModel(
name='CategoryImage',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('image', models.ImageField(upload_to=products.models.category_upload_to)),
('category', models.ForeignKey(related_name='categoryimages', to='products.Category')),
],
),
migrations.CreateModel(
name='Filters',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('filtername', models.CharField(default=b'', max_length=200)),
('filtervalue', models.CharField(default=b'', max_length=200)),
('category', models.ForeignKey(related_name='category', to='products.Category')),
],
),
migrations.CreateModel(
name='Product',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('title', models.CharField(max_length=500)),
('gender', models.CharField(max_length=10, choices=[(b'Male', b'male'), (b'female', b'female'), (b'boys', b'boys'), (b'girls', b'girls')])),
('SKU', models.CharField(unique=True, max_length=100, blank=True)),
('description', models.TextField(max_length=500, null=True, blank=True)),
('price', models.IntegerField()),
('color', models.CharField(max_length=120)),
('discount', models.IntegerField(null=True, blank=True)),
('active', models.BooleanField(default=True)),
('is_related', models.BooleanField(default=False)),
('is_combo', models.BooleanField(default=False)),
('is_verified', models.BooleanField(default=False)),
('in_stock', models.BooleanField(default=False)),
('slug', models.SlugField(unique=True, blank=True)),
('timestamp', models.DateTimeField(auto_now_add=True)),
('brand', models.ForeignKey(related_name='products', to='products.Brand')),
('category', models.ForeignKey(related_name='products', default=b'', verbose_name=b'categories', to='products.Category')),
('parent', models.ForeignKey(related_name='children', blank=True, to='products.Product', null=True)),
],
),
migrations.CreateModel(
name='ProductAttribute',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('name', models.CharField(max_length=100)),
('value', models.CharField(max_length=100)),
('product', models.ForeignKey(to='products.Product')),
],
),
migrations.CreateModel(
name='ProductImage',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('image', models.ImageField(upload_to=products.models.image_upload_to)),
('product', models.ForeignKey(to='products.Product')),
],
),
migrations.CreateModel(
name='Rating',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('rating', models.IntegerField(null=True, blank=True)),
('verified', models.BooleanField(default=False)),
('product', models.ForeignKey(to='products.Product')),
('user', models.ForeignKey(to=settings.AUTH_USER_MODEL)),
],
),
migrations.CreateModel(
name='Size',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('name', models.CharField(max_length=100)),
('value', models.CharField(max_length=100)),
('product', models.ForeignKey(to='products.Product')),
],
),
migrations.AddField(
model_name='filters',
name='product',
field=models.ForeignKey(to='products.Product'),
),
migrations.AlterUniqueTogether(
name='size',
unique_together=set([('product', 'value')]),
),
migrations.AlterUniqueTogether(
name='product',
unique_together=set([('SKU', 'slug', 'category', 'brand')]),
),
]
当我运行迁移时会发生这种情况
django.db.utils.OperationalError: table "products_attribute" already exists
我无法删除数据库文件并迁移，因为我在表中有数据。我该怎么办？ 有没有办法将我的数据保存在某处？
1 个解决方案
解决方案1
2 已采纳 2016-01-13 11:12:59
如果历史上没有执行过的迁移，解决方案很简单：
- 检查数据库中表的结构
- 修改您的模型（撤消一些最近的更改），以便它们与您的数据库结构相对应
- 删除所有迁移（不要忘记 *.pyc 文件）
- 在您的应用程序上运行 makemigrations
- 运行
migrate --fake-initial - 重做对模型的所有更改
- 再次运行 makemigrations
- 运行迁移
Django 1.8迁移“表已存在”
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