从一个需求开始
I want to be able to assign the account manager to the user who is my client.
solution way
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First of all we need to stop thinking in a CRUD way
化身领域的方式来进行，思考namespace，module部分，
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action name
app/contexts/authentication` or `app/domains/authentication关于context或者说domain的设置部分
DDD blue book