- Related Field has invalid lookup: icontains错误
定义Model时，如果有外键()，在admin中如果指定search_fields时，指定了外键汇报错误
Related Field has invalid lookup: icontains
解决方法是search_fields中指定外键对应类的字段，因为类不能search
比如：
# models.py
class School(models.Model):
name = models.CharField(max_length=128, verbose_name="名字")
class Meta:
verbose_name_plural = "学校"
verbose_name = "学校"
class Teacher(models.Model):
name = models.CharField(max_length=128, verbose_name="名字")
school = models.ForeignKey(School, verbose_name="学校")
class Meta:
verbose_name_plural = "老师"
verbose_name = "老师"
school是外键，指定search_fields时指定了school__name
# admin.py
@admin.register(School)
class SchoolAdmin(admin.ModelAdmin):
list_display = ['name']
list_display_links = ['name']
fields = ['name']
search_fields = ['name']
@admin.register(Teacher)
class TeacherAdmin(admin.ModelAdmin):
list_display = ['name', 'school']
list_display_links = ['name']
fields = ['name', 'school']
list_filter = ['school']
search_fields = ['name', 'school__name']
