get() returned more than one Role
錯誤信息：get() returned more than one Role -- it returned 2!
get
Lookup parameters were {'course_id': CourseLocator(u'MOOCOLLEGE', u'B001', u'Always', None, None), 'name': 'Student'}qt
分析：超過一個返回值it
解決：返回一個返回值或使用filter
margin
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