If an app has multiple models with the same field, whats the best practice for keeping things DRY?

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For example, if I have 3 models that look like this:

class CallLog(models.Model):
    lead_id = models.BigIntegerField("Lead ID")
    #  other fields


class EmailLog(models.Model):
    lead_id = models.BigIntegerField("Lead ID")
    #  other fields


class TextLog(models.Model):
    lead_id = models.BigIntegerField("Lead ID")
    #  other fields

Do I add lead_id to each model individually or is there a way to only type it once?

django-models django
1 Answers

Yes, you can define an abstract base class [Django-doc]:

class LeadId(models.Model):
    lead_id = models.BigIntegerField("Lead ID")

    class Meta:
        abstract = True

and then inherit this in the other models:

class CallLog(LeadId, models.Model):
    # other fields…


class EmailLog(LeadId, models.Model):
    # other fields…


class TextLog(LeadId, models.Model):
    # other fields…

You can define multiple such abstract base classes, and use multiple inheritance such that models inherit from multiple of such classes.

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