django使用search_fields报错

django使用search_fields报错（in get_lookup_constraint）

FieldError at /api/workorder/order/

Related Field got invalid lookup: icontains

Request Method:	GET
Request URL:	http://127.0.0.1:8000/api/workorder/order/?search=1
Django Version:	2.0
Exception Type:	FieldError
Exception Value:	Related Field got invalid lookup: icontains
Exception Location:	C:UsersWMAppDataLocalProgramsPythonPython36libsite-packagesdjangodbmodelssqlquery.py in build_lookup, line 1075
Python Executable:	C:UsersWMAppDataLocalProgramsPythonPython36python.exe
Python Version:	3.6.5
Python Path:	['F:git_codeemergency_itilEmergencyResponse', 'F:git_codeemergency_itilEmergencyResponse', 'E:PyCharm 2019.1.1helperspycharm_display', 'C:UsersWMAppDataLocalProgramsPythonPython36python36.zip', 'C:UsersWMAppDataLocalProgramsPythonPython36DLLs', 'C:UsersWMAppDataLocalProgramsPythonPython36lib', 'C:UsersWMAppDataLocalProgramsPythonPython36', 'C:UsersWMAppDataRoamingPythonPython36site-packages', 'C:UsersWMAppDataLocalProgramsPythonPython36libsite-packages', 'E:PyCharm 2019.1.1helperspycharm_matplotlib_backend']
Server time:	星期一, 22 七月 2019 21:07:21 +0800

异常原因：

search_fields = ('content', 'detail','submitter')

这是在view中模糊查询的字段，其中submitter字段是一个外键ForeignKey字段，而作为一个外键，它所对应的不是一个具体的字段，而是一个类。

所以我们应该将其对应成为一个外键关联的摸一个具体的字段，如submitter__username

search_fields = ('content', 'detail','submitter__username')