摘要：我正在遵循南教程。我更改了一个models.py文件，但是当我运行“migrate”时，它不更新psql表。我不知道为什么不。南迁移不更新psql表（django）

我编辑投票/ models.py 我加了班，“调查” 我的“问题”是指调查

models.py

我加入了类添加了一行Survey

，我加入这一行的类问题：

survey = models.ForeignKey(Survey)

其余所有已经存在（基本上按照Django的教程）

import datetime 
from django.db import models 
from django.utils import timezone 

# Create your models here. 

### Adding the Survey class just now, to practice using South 
class Survey(models.Model): 
    survey_name = models.CharField(max_length=190) 
    pub_date = models.DateTimeField('date published') 
    def __unicode__(self): #__str__ instead of __unicode__ if using Python 3, but unicode for python 2 
    return self.survey_name 
    def was_published_recently(self): 
    return self.pub_date >= timezone.now() - datetime.timedelta(days=1) 
    was_published_recently.admin_order_field = 'pub_date' 
    was_published_recently.boolean = True 
    was_published_recently.short_description = 'Published recently?' # for admin site 


class Question(models.Model): 
    survey = models.ForeignKey(Survey) ### this is a new line based on adding the Survey class above 
    question_text = models.CharField(max_length=200) 
    pub_date = models.DateTimeField('date published') 
    def __unicode__(self): #__str__ instead of __unicode__ if using Python 3, but unicode for python 2 
    return self.question_text 
    def was_published_recently(self): 
    return self.pub_date >= timezone.now() - datetime.timedelta(days=1) 
    was_published_recently.admin_order_field = 'pub_date' 
    was_published_recently.boolean = True 
    was_published_recently.short_description = 'Published recently?' # for admin site 


class Choice(models.Model): 
    question = models.ForeignKey(Question) 
    choice_text = models.CharField(max_length=200) 
    votes = models.IntegerField(default=0) 
    def __unicode__(self): 
    return self.choice_text

终端

我做schemamigration表示，它加入模型polls.Survey

（app01）MoriartyMacBookAir13：getstartapp MACUSER $ vim polls/models.py （app01）MoriartyMacBookAir13：getstartapp macuser $ python manage.py schemamigration民意调查--auto 您不能在没有迁移的应用上使用--auto秒。尝试 - 初始。（app01）MoriartyMacBookAir13：getstartapp MACUSER $ sudo的蟒蛇manage.py schemamigration投票--initial
- 新增模型polls.Survey
- 新增模型polls.Question
- 新增模型polls.Choice 创建0001_initial。 PY。现在，您可以将此迁移有：./manage.py迁移投票

我双重检查的调查并没有在PSQL表中存在尚未：

(app01)MoriartyMacBookAir13:getstartapp macuser$ heroku pg:psql 
---> Connecting to HEROKU_POSTGRESQL_YELLOW_URL (DATABASE_URL) 
psql (9.3.5, server 9.3.3) 
SSL connection (cipher: DHE-RSA-AES256-SHA, bits: 256) 
Type "help" for help. 

app01::YELLOW=> \d 
          List of relations 
Schema |     Name     | Type |  Owner  
--------+--------------------------------------+----------+---------------- 
public | account_emailaddress     | table | aqolirupsmmmqz 
public | account_emailaddress_id_seq   | sequence | aqolirupsmmmqz 
public | account_emailconfirmation   | table | aqolirupsmmmqz 
public | account_emailconfirmation_id_seq  | sequence | aqolirupsmmmqz 
public | auth_group       | table | aqolirupsmmmqz 
public | auth_group_id_seq     | sequence | aqolirupsmmmqz 
public | auth_group_permissions    | table | aqolirupsmmmqz 
public | auth_group_permissions_id_seq  | sequence | aqolirupsmmmqz 
public | auth_permission      | table | aqolirupsmmmqz 
public | auth_permission_id_seq    | sequence | aqolirupsmmmqz 
public | auth_user       | table | aqolirupsmmmqz 
public | auth_user_groups      | table | aqolirupsmmmqz 
public | auth_user_groups_id_seq    | sequence | aqolirupsmmmqz 
public | auth_user_id_seq      | sequence | aqolirupsmmmqz 
public | auth_user_user_permissions   | table | aqolirupsmmmqz 
public | auth_user_user_permissions_id_seq | sequence | aqolirupsmmmqz 
public | discover_author      | table | aqolirupsmmmqz 
public | discover_author_id_seq    | sequence | aqolirupsmmmqz 
public | discover_awedio      | table | aqolirupsmmmqz 
public | discover_awedio_id_seq    | sequence | aqolirupsmmmqz 
public | discover_user      | table | aqolirupsmmmqz 
public | discover_user_id_seq     | sequence | aqolirupsmmmqz 
public | django_admin_log      | table | aqolirupsmmmqz 
public | django_admin_log_id_seq    | sequence | aqolirupsmmmqz 
public | django_content_type     | table | aqolirupsmmmqz 
public | django_content_type_id_seq   | sequence | aqolirupsmmmqz 
public | django_session      | table | aqolirupsmmmqz 
public | django_site       | table | aqolirupsmmmqz 
public | django_site_id_seq     | sequence | aqolirupsmmmqz 
public | hello_greeting      | table | aqolirupsmmmqz 
public | hello_greeting_id_seq    | sequence | aqolirupsmmmqz 
public | polls_choice       | table | aqolirupsmmmqz 
public | polls_choice_id_seq     | sequence | aqolirupsmmmqz 
public | polls_question      | table | aqolirupsmmmqz 
public | polls_question_id_seq    | sequence | aqolirupsmmmqz 
[other tables, but no more polls tables] 
public | south_migrationhistory    | table | aqolirupsmmmqz 
public | south_migrationhistory_id_seq  | sequence | aqolirupsmmmqz 
(45 rows) 

app01::YELLOW=> \q

现在为了更新并创建polls_survey，我建议运行migrate命令...但是，psql表不会更新。任何建议为什么？下面是命令的充分反应：

```
（app01）MoriartyMacBookAir13：getstartapp MACUSER $ sudo的蟒蛇manage.py迁移民调用于投票运行的迁移： - 没有迁移。 - 加载民意调查的初始数据。从0固定装置（S）（app01）MoriartyMacBookAir13安装0对象（S）：getstartapp MACUSER $ sudo的蟒蛇manage.py执行syncdb 同步... 创建表... 安装自定义的SQL ... 安装索引。 .. 从0夹具（一个或多个）

Synced: 
> django.contrib.admin 
> django.contrib.auth 
> django.contrib.contenttypes 
> django.contrib.sessions 
> django.contrib.messages 
> django.contrib.staticfiles 
> storages 
> evernote 
> discover 
> hello 
> south 
> django.contrib.sites 
> djrill 
> allauth.socialaccount.providers.linkedin 

Not synced (use migrations): 
- polls 
- allauth 
- allauth.account 
- allauth.socialaccount 
- allauth.socialaccount.providers.facebook 
(use ./manage.py migrate to migrate these) 
(app01)MoriartyMacBookAir13:getstartapp macuser$ sudo python manage.py migrate polls 
Running migrations for polls: 
- Nothing to migrate. 
- Loading initial data for polls. 
Installed 0 object(s) from 0 fixture(s) 
(app01)MoriartyMacBookAir13:getstartapp macuser$ 

(app01)MoriartyMacBookAir13:getstartapp macuser$ sudo python manage.py convert_to_south polls 
This application is already managed by South. 
(app01)MoriartyMacBookAir13:getstartapp macuser$ sudo python manage.py migrate polls 
Running migrations for polls: 
- Nothing to migrate. 
- Loading initial data for polls. 
Installed 0 object(s) from 0 fixture(s) 
(app01)MoriartyMacBookAir13:getstartapp macuser$ sudo python manage.py schemamigration polls --auto 
Nothing seems to have changed. 
(app01)MoriartyMacBookAir13:getstartapp macuser$

```

即，polls_survey仍然没有在PSQL表中存在已安装的0（多个）对象的，但执行syncdb并迁移都为无影响...所以psql不反映蟒蛇描述的数据模型...

任何建议我在做什么错在这里？

万一有用：settings.py文件有我的Heroku psql的登录信息在里面，所以我为什么能够成功运行的Heroku PG：psql的命令上面

来源

2014-10-29 Mark

我认为你必须运行schemamigration - 在改变模型和添加模型之前，初始化。运行模式迁移 - 初始化后，更改模型并添加新模型。然后运行schemamigration --auto，然后迁移命令。它应该相应地更改您的数据库。

步骤

运行python manage.py schemamigration投票--initial（改变模型之前）
更改models.py
运行python manage.py schemamigration投票--auto
运行python manage.py migrate民意调查

来源

2014-11-04 06:59:40 itsme

南迁移不更新psql表（django）

models.py

终端

回答

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