Django:链接'startswith'和'iexact'查询过滤器?

AP2*_*257 12 python django django-queryset

我想startswith在Django中做一个不区分大小写的查询:

     books = Book.objects.filter(title__iexact__startswith=query)
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但是我收到以下错误消息:

FieldError at /names/
Join on field 'title' not permitted
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如何startswith在Django中指定不区分大小写?