Django模型验证器中可以使用多个值吗? [英] Can multiple values be used in django a model validator?

问题描述

我为模型验证器使用了一个名为CompareDates的验证类的模型，我想向验证器传递两个字段值.但是我不确定如何在验证器中使用多个字段值.

I've got a model using a validation class called CompareDates for my model validators and I want to pass the validator two field values. However I'm unsure of how to use multiple field values in a validator.

我希望能够在日期之间进行比较，以验证整个模型，但似乎您无法为传递给验证器的值建立关键字，或者我遗漏了什么?

I want to be able to make comparisons between the dates in order to validate the model as a whole but it doesn't seem like you can keyword the values passed to the validators, or am I missing something?

from django.db import models
from myapp.models.validators.validatedates import CompareDates

class GetDates(models.Model):
    """
    Model stores two dates
    """
    date1 = models.DateField(
            validators = [CompareDates().validate])
    date2 = models.DateField(
            validators = [CompareDates().validate])

推荐答案

常规"验证器将仅获取当前字段值.因此，它不会执行您要尝试执行的操作.但是，您可以添加一个干净的方法，并且-如果需要的话-覆盖您的save方法，如下所示:

The "normal" validators will only get the current fields value. So it will not do what you are trying to do. However, you can add a clean method, and - if need should be - overwrite your save method like that:

class GetDates(models.Model):
    date1 = models.DateField(validators = [CompareDates().validate])
    date2 = models.DateField(validators = [CompareDates().validate])
    def clean(self,*args,**kwargs):
        CompareDates().validate(self.date1,self.date2)
    def save(self,*args,**kwargs):
        # If you are working with modelforms, full_clean (and from there clean) will be called automatically. If you are not doing so and want to ensure validation before saving, uncomment the next line.
        #self.full_clean()
        super(GetDates,self).save(*args,**kwargs)

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