[英]Creating unique index with peewee for table with foreign key
Say that I have a table called TBL_ACCOUNT which contains all of my users, and a table called TBL_EMAIL_SUBSCRIPTION where it contains the feeds that a user is subscribed to. 假设我有一个名为TBL_ACCOUNT的表,其中包含我的所有用户,还有一个名为TBL_EMAIL_SUBSCRIPTION的表,其中包含用户已订阅的提要。 I'm trying to make it so that there can only be one entry of each user+feed combination, so user1 can only be subscribed to feed1 once, but user1 can be subscribed to feed1 and feed2 simultaneously.
我正在尝试使其每个用户+ feed组合中只有一个条目,因此user1只能订阅一次feed1,但是user1可以同时订阅feed1和feed2。
This is what my model looks like: 这是我的模型的样子:
class TBL_ACCOUNT(BaseModel):
USERNAME = CharField(unique=True)
PASSWORD = CharField()
EMAIL = CharField(unique=True)
class TBL_EMAIL_SUBSCRIPTION(BaseModel):
USER = ForeignKeyField(TBL_ACCOUNT)
FEED = CharField()
class Meta:
indexes = (("USER_id", "FEED", True))
I have also tried just using "USER" for the indexes, but that didn't work out as the database still received duplicates. 我也尝试过仅使用“ USER”作为索引,但是由于数据库仍然收到重复项,因此无法解决。
Please refer to the peewee docs: http://docs.peewee-orm.com/en/latest/peewee/models.html#indexes-and-constraints 请参考peewee文档: http ://docs.peewee-orm.com/en/latest/peewee/models.html#indexes-and-constraints
In your case it should look like this: 在您的情况下,它应如下所示:
class Meta:
indexes = (
(("USER_id", "FEED"), True),
)
Note the use of commas! 注意使用逗号! They are very important, because indexes are a tuple of tuples.
它们非常重要,因为索引是元组的元组。
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