今天在同一个表里，有多个不同的用户集时出现。
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fields.E304: Field name
<field name>*es with accessor for<fieldname>.
网上解决方案，增加不同的related_name解决。
http://blog.csdn.net/meylovezn/article/details/46924893
related_name will be a unique column in db table, so a model cannot have two or more outgoing relations with the same name.