[英]Heterogeneous Lists in Python MongoEngine
does MongoEngine supports having different data types in a list? MongoEngine支持在列表中使用不同的数据类型吗? For example, I'd like a
ListField()
to store IntField()
as well as StringField()
. 例如,我想要一个
ListField()
来存储IntField()
以及StringField()
。 Is there a way to do this in MongoEngine? 在MongoEngine中有没有办法做到这一点?
The ListField
does not enforce a datatype unless you ask it to. 除非您要求,否则
ListField
不会强制实施数据类型。 However if you do then it has to be a single datatype at the moment. 但是,如果您这样做,那么它必须是单个数据类型。 For example
例如
This works: 这有效:
import mongoengine as mdb
class Stuff(mdb.Document):
things = mdb.ListField()
s = Stuff(things=['1',2,[4,5]])
s.save()
this throws TypeError
as it is enforcing a datatype: 这会抛出
TypeError
因为它强制执行数据类型:
import mongoengine as mdb
class Stuff(mdb.Document):
things = mdb.ListField(mdb.IntField())
s = Stuff(things=['1',2,[4,5]])
s.save()
this throws AttributeError
as it is expecting a Field as the first argument: 这会抛出
AttributeError
因为它期望Field作为第一个参数:
import mongoengine as mdb
class Stuff(mdb.Document):
things = mdb.ListField([mdb.IntField(),mdb.StringField(),mdb.ListField()])
s = Stuff(things=['1',2,[4,5]])
s.save()
I can see the final example being a useful so you might want to file an issue on the project repo. 我可以看到最后的示例是有用的,因此您可能希望在项目仓库中提交问题 。
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