Python peewee 外键

Question

如果我有下表:

class Ticket(BaseModel):
    event = ForeignKeyField(Event)
    category = ForeignKeyField(TicketCategory)
    order_number = IntegerField()
    tier_name = CharField()
    num_available = IntegerField()
   price = DecimalField()

然后我执行下面的代码:

tickets = Ticket.select()
for ticket in tickets:

     print ticket.event.id

访问外部对象的主键是否会强制 peewee 启动另一个查询？或者 peewee 是否足够聪明，知道该 ID 已经可用？

Answer 1

几年过去了，但对于偶然发现此页面的其他人来说，现在您可以使用 Django 使用的相同语法:<>_id 来访问 id。在这种情况下，ticket.event_id。

根据 docs :

Sometimes you only need the associated primary key value from the foreign key column. In this case, Peewee follows the convention established by Django, of allowing you to access the raw foreign key value by appending "_id" to the foreign key field’s name:

然而，值得注意的是，这仅在访问查询对象的值时有效。换句话说，如果您想更改事件 ID，只需设置

ticket.event = new_event_id

而不是尝试设置 ticket.event_id。

尝试基于外键进行选择时也是如此:

Ticket.select().where(event == desired_event_id)