Question

我对此感到疯狂。

我用MySQLWorkbench创建了我的数据库

比使用terminal命令获取模型代码：

$python3 manage.py inspectie

将代码传递给models.py之后，我尝试使用shell中的模型

$ python3 manage.py shell

但是我总是得到这个错误：

＆＃34; AssertionError：模型不能有多个AutoField。＆＃34;

但错误没有意义，因为每个模型中只有一个AutoField，请参阅：

class Brands(models.Model):
    bid = models.AutoField(db_column='BID')  # Field name made lowercase.
    name = models.CharField(db_column='Name', max_length=45, blank=True, null=True)  # Field name made lowercase.
    fair = models.IntegerField(db_column='Fair', blank=True, null=True)  # Field name made lowercase.
    eco = models.IntegerField(db_column='Eco', blank=True, null=True)  # Field name made lowercase.
    country = models.CharField(db_column='Country', max_length=45, blank=True, null=True)  # Field name made lowercase.
    companies = models.ForeignKey('Companies', models.DO_NOTHING, db_column='Companies_ID')  # Field name made lowercase.

    class Meta:
        managed = False
        db_table = 'Brands'
        unique_together = (('bid', 'companies'),)


class Companies(models.Model):
    cid = models.AutoField(db_column='CID')  # Field name made lowercase.
    name = models.CharField(db_column='Name', max_length=45, blank=True, null=True)  # Field name made lowercase.
    fair = models.IntegerField(db_column='Fair', blank=True, null=True)  # Field name made lowercase.
    eco = models.IntegerField(db_column='Eco', blank=True, null=True)  # Field name made lowercase.
    country = models.CharField(db_column='Country', max_length=45, blank=True, null=True)  # Field name made lowercase.
    concerns = models.ForeignKey('Concerns', models.DO_NOTHING, db_column='Concerns_ID')  # Field name made lowercase.

    class Meta:
        managed = False
        db_table = 'Companies'
        unique_together = (('cid', 'concerns'),)


class Concerns(models.Model):
    cid = models.AutoField(db_column='CID', primary_key=True)  # Field name made lowercase.
    name = models.CharField(db_column='Name', max_length=45, blank=True, null=True)  # Field name made lowercase.
    fair = models.IntegerField(blank=True, null=True)
    eco = models.IntegerField(db_column='Eco', blank=True, null=True)  # Field name made lowercase.
    country = models.CharField(db_column='Country', max_length=45, blank=True, null=True)  # Field name made lowercase.

    class Meta:
        managed = False
        db_table = 'Concerns'


class Products(models.Model):
    pid = models.AutoField(db_column='PID')  # Field name made lowercase.
    name = models.CharField(db_column='Name', max_length=45, blank=True, null=True)  # Field name made lowercase.
    ean = models.IntegerField(db_column='EAN', blank=True, null=True)  # Field name made lowercase.
    fair = models.IntegerField(db_column='Fair', blank=True, null=True)  # Field name made lowercase.
    eco = models.IntegerField(db_column='Eco', blank=True, null=True)  # Field name made lowercase.
    companies_id = models.IntegerField(db_column='Companies_ID')  # Field name made lowercase.
    brands = models.ForeignKey(Brands, models.DO_NOTHING, db_column='Brands_ID')  # Field name made lowercase.
    brands_companies = models.ForeignKey(Brands, models.DO_NOTHING, db_column='Brands_Companies_ID')  # Field name made lowercase.

    class Meta:
        managed = False
        db_table = 'Products'
        unique_together = (('pid', 'companies_id', 'brands', 'brands_companies'),)


class ProductsHasShoppinglists(models.Model):
    products = models.ForeignKey(Products, models.DO_NOTHING, db_column='Products_ID')  # Field name made lowercase.
    products_companies = models.ForeignKey(Products, models.DO_NOTHING, db_column='Products_Companies_ID')  # Field name made lowercase.
    shoppinglists = models.ForeignKey('Shoppinglists', models.DO_NOTHING, db_column='ShoppingLists_ID')  # Field name made lowercase.
    shoppinglists_users = models.ForeignKey('Shoppinglists', models.DO_NOTHING, db_column='ShoppingLists_Users_ID')  # Field name made lowercase.

    class Meta:
        managed = False
        db_table = 'Products_has_ShoppingLists'
        unique_together = (('products', 'products_companies', 'shoppinglists', 'shoppinglists_users'),)


class Shoppinglists(models.Model):
    id = models.AutoField(db_column='ID')  # Field name made lowercase.
    products = models.CharField(db_column='Products', max_length=45, blank=True, null=True)  # Field name made lowercase.
    users = models.ForeignKey('Users', models.DO_NOTHING, db_column='Users_ID')  # Field name made lowercase.

    class Meta:
        managed = False
        db_table = 'ShoppingLists'
        unique_together = (('id', 'users'),)


class Users(models.Model):
    uid = models.AutoField(db_column='UID', primary_key=True)  # Field name made lowercase.
    firstname = models.CharField(db_column='FirstName', max_length=45, blank=True, null=True)  # Field name made lowercase.
    lastname = models.CharField(db_column='LastName', max_length=45, blank=True, null=True)  # Field name made lowercase.
    email = models.CharField(db_column='Email', max_length=45, blank=True, null=True)  # Field name made lowercase.

    class Meta:
        managed = False
        db_table = 'Users'

我只是不明白这个问题!!!

Answer 1

来自docs：

默认情况下，Django为每个模型提供以下字段：

id = models.AutoField（primary_key = True）

这是一个自动递增的主键。

如果您想指定自定义主键，请指定   其中一个字段的primary_key = True。如果Django看到你了   显式设置Field.primary_key，它不会添加自动id   列。

每个模型只需要一个字段即可使primary_key = True（或者   明确声明或自动添加）。

所以尝试像这样设置primary_key=True：

bid = models.AutoField(db_column='BID', primary_key=True)

Answer 2

尝试在你的AutoField中设置primary_key = True。因为如果你没有设置primary_key = True，django将自动创建其他AutoFiled。见文摘：

https://docs.djangoproject.com/en/1.11/ref/models/fields/ https://docs.djangoproject.com/en/1.11/topics/db/models/#automatic-primary-key-fields

Django - Python 3 - ＆＃34; AssertionError：模型不能有多个AutoField。＆＃34;

2 个答案: