postgresql – 南数据库错误：关系已经存在

python manage.py syncdb
python manage.py convert_to_south myapp
python manage.py migrate myapp 0001 --fake

根据这个ticket的最后评论进行处理(因为我有一个自定义用户模型).

然后我想我做了一个架构迁移和迁移？我不完全记得,但我最终得到的是两个名为0001_initial.py和0002_initial.py的迁移文件,这些文件看起来并不完全正确.

今天我尝试在我的一个模型中添加一个字段并进行迁移：

$python manage.py schemamigration myapp --auto
 ? The field 'Photo.main_person' does not have a default specified,yet is NOT NULL.
 ? Since you are adding this field,you MUST specify a default
 ? value to use for existing rows. Would you like to:
 ?  1. Quit now,and add a default to the field in models.py
 ?  2. Specify a one-off value to use for existing columns now
 ? Please select a choice: 2
 ? Please enter Python code for your one-off default value.
 ? The datetime module is available,so you can do e.g. datetime.date.today()

 >>> 1
 + Added field main_person on myapp.Photo
Created 0003_auto__add_field_photo_main_person.py. You can now apply this migration with: ./manage.py migrate myapp

$python manage.py migrate myapp
Running migrations for myapp:
 - Migrating forwards to 0003_auto__add_field_photo_main_person.
 > myapp:0002_initial
FATAL ERROR - The following SQL query failed: CREATE TABLE "myapp_patient" ("id" serial NOT NULL PRIMARY KEY,"password" varchar(128) NOT NULL,"last_login" timestamp with time zone NOT NULL,"email" varchar(255) NOT NULL UNIQUE,"first_name" varchar(100) NOT NULL,"last_name" varchar(100) NOT NULL,"is_active" boolean NOT NULL,"is_admin" boolean NOT NULL,"is_staff" boolean NOT NULL)
The error was: relation "myapp_patient" already exists

Error in migration: myapp:0002_initial
DatabaseError: relation "myapp_patient" already exists

因此它创建了迁移0003_auto__add_field_photo_main_person但似乎无法通过第二次迁移.应该/我可以删除第二个迁移文件吗？它与第一个完全相同,这似乎是造成问题的原因,但我在南方并不够精通,知道这是不是一个好主意.