Question

As I am working through https://docs.djangoproject.com/en/1.4/topics/db/models/ , in django, I have started a new app called myapp and edited the the models.py file as the walkthrough defines:

class Person(models.Model):
  GENDER_CHOICES = (
    (u M , u Male ),
    (u F , u Female )
  )
  name = models.CharField(max_length=60)
  gender = models.CharField(max_length=2, choices=GENDER_CHOICES)

然后,我打上了<代码>manage.py syncdb,并试图在<代码>manage.py Shell中操作下面几条线路。

>>> p = Person(name="Fred Flintstone", gender="M")
>>> p.save()
Traceback (most recent call last):
  .…[I removed a few lines]...
  DatabaseError: table myapp_person has no column named name
>>> p.gender
u M 
>>> p.get_gender_display()
u Male

......因此,我检查了Sqlite3在名为名列人的数据库中是否有物体。

C:UsersdjangoSite>python manage.py sql myapp
BEGIN;
CREATE TABLE "myapp_person" (
"id" integer NOT NULL PRIMARY KEY,
"name" varchar(60) NOT NULL,
"gender" varchar(2) NOT NULL

;

And of course it does! So the Person model exists, however it doesn t get the fields that I designed it with in models.py? I did a dir(Person) calls and it confirms that the name and gender fields aren t in there… secondly, I did dir(p) and it does have them. I suppose that is because we just added them in with that tuple, so that s not a surprise.

当时的主要问题是:

Why can t I p.save() ?
Why doesn t the import call bring in objects with the fields that I designed in models.py?
Is this by design?
Am I just doing it wrong?

Answer 1

为什么能打上Ip.save(?

表格中没有一栏名。 <代码>manage.py sql myapp 仅凭你的模式,显示干jan的 generate。没有实际表格。 (当然,它应当相应) 重要的是,你必须进入你的qlite数据库,核对表格及其图象。我认为,在开发I syncdb时,稍后将对该模式进行修改。 Re-syncing db don treving the table. 您必须删除表格,然后再作改动。

为什么要把进口呼吁带入我设计成模型的领域。 ??

Please modify your question to reflect this issue, it doens t look like you have any issues accessing or instantiating a person object.

这是否通过设计?

我认为,这并不是设计的,因为新用户正在学习一个新框架,因此,这些都是共同的问题。我在学到的数周和数月中都遇到了这些问题,这些问题将更加遥远。保证你正确核实工作。检查管理。 py sql myappn t that relevant. 检查贵国数据库以观察该表更为相关。 Django是一个成熟的平台,它给你一个错误,如<条码> 开放栏。时间的99.9%完全意味着它是透明的。

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