Question

我界定了两种模式:

class Server(models.Model):
    owners = models.ManyToManyField( Person )

class Person(models.Model):
    name = models.CharField(max_length=50)

admin.site.register(Server)
admin.site.register(Person)

之后,我甚至检查了 s,只是为了 f:

BEGIN;
CREATE TABLE "servers_server_owners" (
    "id" integer NOT NULL PRIMARY KEY,
    "server_id" integer NOT NULL,
    "person_id" integer NOT NULL,
    UNIQUE ("server_id", "person_id")
)
;
CREATE TABLE "servers_server" (
    "id" integer NOT NULL PRIMARY KEY,
    "name" varchar(50) NOT NULL,
    "port" integer unsigned NOT NULL,
    "state" integer NOT NULL
)
;
CREATE TABLE "servers_person" (
    "id" integer NOT NULL PRIMARY KEY,
    "name" varchar(50) NOT NULL
)
;
COMMIT;

甚至有<条码>。

我在<代码>syncdb上安装了数据库的新模型。我去了行政接口,以界定一些玩物,但我有以下错误:

DatabaseError at /admin/servers/server/1/  
no such table: servers_server_owners

我关闭了DC-server, 运行syncdb,再次启用服务器: 还有一个同样的问题。为什么会失败,尽管我刚才告诉我,这还是产生了id?

Answer 1

事实上,问题是,这个表永远不会产生。页: 1 我用django略为新鲜,我不知道/manage.py syncdb没有更新现有的模型,而只是创造不存在的模式。

由于该模型服务器在我添加了另一个模型之前就已存在,而且该模型已经安装在db中,因此Syncdb实际上没有创建新的表格。

Answer 2

展望未来,见-South,这对应用你对数据库的模型变化非常有用,不必每当你改变模型时建立一个新的数据库。

With it you can easily: python manage.py migrate app_name and South will write your model changes. The documentation is pretty straightforward.

Answer 3

I meet the same problem today and fix it. I think you miss some command in tutorial 1. just do follow:

./python manage.py makemigrations polls
python manage.py sql polls
./python manage.py syncdb

then fix it and gain the table polls and you can see the table created. you should read the manage.py makemigrations command.

Answer 4

for django 1.9, this is what i did and it solved the issue.

python manage.py makemigrations app_name

python管理。迁徙

Answer 5

use "manage.py help" to check the command
if you find migrate and makemigration, it means your python has updated

步骤1:

python manage.py makemigration

结果1:

Migrations for  mainsite :
mainsitemigrations001_initial.py
- Create model Post

步骤2:

python manage.py migrate

结果2:

Operations to perform:
Apply all migrations: admin, auth, contenttypes, mainsite, sessions
Running migrations:
Applying mainsite.0001_initial... OK

最后,执业者。 Done

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