[FIX] Revoke permission should respect to given grantee and access type. #1998
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The issue is, if you try to revoke the permission of a user from an
object, all the permissions on this object get removed. The fix is
assigning filtered query object to it's own reference.
According to SQLAlchemy documentation,
filter
method applies tothe copy of the query object which means calling filter doesn't
affect the object receiving filter call. For more information;
http://docs.sqlalchemy.org/en/latest/orm/query.html#sqlalchemy.orm.query.Query.filter