[Django]-Transient use of Django Model instances

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1👍

✅

In order to remain as DRY as possible, you could have an abstract mock class deriving your model:

class A(models.Model):
    # fields'n'stuff

class TransientA(A):
    def save(*args, **kwargs):
        pass  # avoid exceptions if called

    class Meta:
        abstract = True  # no table created

Now, even if you call save on it anywhere (even in methods inherited from A), you’ll be shooting blanks.

👤user2390182

3👍

You’ll need both:

abstract = True is useful if inheritants still should be concrete models, so that no table should be created just for the parent class. It allows you to opt out of multi-table inheritance, and instead have the shared attributes duplicated to inheritants tables instead (abstract base inheritance).

managed = False is useful if the inheriting class should never be persisted at all. Django migrations and fixtures won’t generate any database table for this.

class TransientModel(models.Model):
    """Inherit from this class to use django constructors and serialization but no database management"""
    def save(*args, **kwargs):
        pass  # avoid exceptions if called

    class Meta:
        abstract = True  # no table for this class
        managed = False  # no database management

class Brutto(TransientModel):
    """This is not persisted. No table app_brutto"""
    #do more things here
    pass
👤abstraktor

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