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各位大神,我有A,B,C三个对象,他们之间的关系是这样的:A---many2one----BA---one2many----CC呢有个字段是类似下拉框的那种,假设是status字段,现在我要在A的新建视图(FORM视图)里选择B,然后呢在A的视图里又新建个C,但是C中的status字段又受所选择的B来约束,比如选择B1,那么status字段只有3个,选择B2,那么status字段只有2个。请问这个需求好实现吗?如何实现呢?谢谢!