many to many vs new object with compound foreign keys in django -

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i have seen many many relationships expressed explicitly in model like:

class pizza(models.model):     toppings = models.manytomanyfield(topping, blank=true, null=true)

i have seen people use object compound object this

class pizzatopping(models.model):     pizza = models.foreignkey(pizza)     topping = models.foreignkey(topping)

is there more preferable method of two? if so, why?

example number 2 used when have additional fields in intermediary table (which example not have). example number 1 suffice when don't.


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