Autogenerating Multiple MetaData collections

自动生成多个元数据集合

The target_metadata collection may also be defined as a sequence if an application has multiple MetaData collections involved:

如果应用程序涉及多个 MetaData 集合，则 target_metadata 集合也可以定义为一个序列：

from myapp.mymodel1 import Model1Base
from myapp.mymodel2 import Model2Base
target_metadata = [Model1Base.metadata, Model2Base.metadata]

The sequence of MetaData collections will be consulted in order during the autogenerate process. Note that each MetaData must contain unique table keys (e.g. the “key” is the combination of the table’s name and schema); if two MetaData objects contain a table with the same schema/name combination, an error is raised.

在自动生成过程中，将按顺序查询 MetaData 集合的顺序。 请注意，每个 MetaData 必须包含唯一的表键（例如，“键”是表名和模式的组合）； 如果两个 MetaData 对象包含一个具有相同模式/名称组合的表，则会引发错误。