Great thanks for the answer.

But if these object are already in my session? For example, I create a
query, get some related objects from the query. Then the user modifies all
objects, but he decides to save only one object, while remaining objects
must be changed (user may decide to save this changes later, after some
minutes, or he may decide cancel the changes for unsaved objects). What can
I do in this situation?

Thanks in advance.

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