model的查询操作

xx.objects.model.filter(pk__contains="")

xx.objects.model.filter(pk__in="")

xx.objects.model.filter(pk__startwith="")

# 获取表中字段名的对象

field_obj = xxx.objects.model._meta.get_field("字段名")

# 获取外键关联的所有对象

fielid_obj.rel.to.objects.all()