peewee - modify db model meta (e.g. schema) dynamically

问题

In order to insert same data to same set of tables in different schemas (data about the mobile application where app id is primary key but app is cross-platform and exists on different platforms. Schema per platfrom so pp id does not interfere for tables with it as fk).

I already has some infrastructure for it and I wasn't expecting this requirement. For me I see the easiest way is having existing model class binded to some db+schema_1+table_name insert data to first schema then somehow update classs meta to db+schema_2+table_name and call insert again.

For example, if I have the following base class with Meta set:

class BaseClass_1:
    class Meta_1:
        legacy_table_names = False
        database = db
        schema = 'schema_1'

and the another meta for another schema:

class Meta_2:
    legacy_table_names = False
    database = db
    schema = 'schema_2'
    primary_key = CompositeKey('app_id')
    db_table = 'table_name'

and the model class:

class Table(BaseClass_1):
    date = DateTimeField()
    app_id = TextField()

    class Meta:
        primary_key = CompositeKey('app_id')
        db_table = 'table_name'

then if I do the following:

Table.insert_many(some_data)
Table._meta = Meta_2
Table._meta = Meta_2()

I see that there is Meta class or object is set instead of "Metadata" objects as it was before modification. Unfortunately I did not find how to instantiate Metadata object. Is it possible, is this research direction hopeful?

来源：https://stackoverflow.com/questions/58166180/peewee-modify-db-model-meta-e-g-schema-dynamically