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Python - Django - Model BooleanField Dependent On Other BooleanField In Same Model

I am using Django to write a web application and would like to know if it is possible to have a BooleanField within a model for which the value will be based on other BooleanFields in the same model.

Basically, I would like one BooleanField in the model to be True only if all other BooleanFields in the model are True.

For example, with the Model below:

class ModelEx(models.Model):
   booleanA = models.BooleanField(default=False)
   booleanB = models.BooleanField(default=False)
   booleanC = models.BooleanField(default=False)
   booleanD = models.BooleanField(default=False)

I would like booleanA to be True only if booleanB and booleanC and booleanD are True.

I have not found any information about this so it would be great if anyone knew if there is a solution for this.

Thanks.

Solution

  • You can override the save method of your model. 

    class ModelEx(models.Model):
   booleanA = models.BooleanField(default=False)
   booleanB = models.BooleanField(default=False)
   booleanC = models.BooleanField(default=False)
   booleanD = models.BooleanField(default=False)

   def save(self, *args, **kwargs):
       self.booleanA = self.booleanA and self.booleanB and self.booleanC
       return super(ModelEx, self).save(*args, **kwargs)