python - Django 模型 : sum in def

Question

如何对模型中的字段求和？如果可能的话，我有 2 个整数字段并想在 def 中对它们求和？

class Blank_list(models.Model):
    expert = models.ForeignKey(Expert, null=True, on_delete=models.SET_NULL, related_name='blank_list')
    employee = models.ForeignKey(Employee, null=True, on_delete=models.SET_NULL, related_name='blank_list')
    c8_lvl_aw1 = models.IntegerField('К8: 1', choices=ANSWER_TYPES, default=0, blank=0)
    c8_lvl_aw2 = models.IntegerField('К8: 2', choices=ANSWER_TYPES, default=0, blank=0)
    
    def __str__(self):
        return "%s произвел оценку следующего сотрудника: %s" % (self.expert, self.employee)

    #that example what i'm expect
    def sum_all_fields(self):
        sum = c8_lvl_aw1 + c8_lvl_aw2 
        return sum

Answer 1

目前这两个字段具有相同的名称。您应该重命名两者之一，例如将第二个重命名为 c8_lvl_aw1 .然后你可以总结self.c8_lvl_aw1和 self.c8_lvl_aw2 :

class Blank_list(models.Model):
    expert = models.ForeignKey(Expert, null=True, on_delete=models.SET_NULL, related_name='blank_list')
    employee = models.ForeignKey(Employee, null=True, on_delete=models.SET_NULL, related_name='blank_list')
    c8_lvl_aw1 = models.IntegerField('К8: 1', choices=ANSWER_TYPES, default=0, blank=0)
    c8_lvl_aw2 = models.IntegerField('К8: 2', choices=ANSWER_TYPES, default=0, blank=0)
    
    def __str__(self):
        return "%s произвел оценку следующего сотрудника: %s" % (self.expert, self.employee)

    #that example what i'm expect
    def sum_all_fields(self):
        return self.c8_lvl_aw1 + self.c8_lvl_aw2

Note: normally a Django models, just like all classes in Python are given a name in PerlCase, not snake_case, so it should be: BlankList instead of Blank_list.