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在odoo10中,如何查询多个表? 例如:表A,表B两个表。B是A的明细,A中的字段: a1=fields.Many2one(....) a2=... a2b=fields.One2many(B的_name,'a_id') B中的字段: a_id=fields.Many2one(A的_name) b1=fields.Many2one(....) b2=... b3=... 要以a1与b1为条件查询a2、b2与b3,如何写?