Django model organization: food item locations in different grocery stores - django

Question

I'm working on a cookbook app and I want to sort the ingredients of a recipe by their aisle in the grocery store. Since different grocery stores have different configurations, I want users to be able to sort the lists of ingredients by a selected store. I'm new to Django and am stuck on figuring out the models that I'll need for this. I think I want to have a many to many relationship between my Food model and a Store model. I think I want to use the through argument and have another intermediary Location model that connects the 'Food' and 'Store' and also contains which the aisle.
If possible, I'd like to have the choices for aisle have a certain description that depends on the selection of the Store object
class Food(models.Model):
name = models.CharField(max_length=100)
grocery_aisle = models.ManytoManyField(Store, through='Location')
class Store(models.Model):
name = models.CharField(max_length=100)
aisles = { # Not really sure how to store this kind of information which would be different for each Store object.
0: 'Produce Section',
1: 'Aisle 1: bread and peanutbutter',
2: 'Frozen Desserts',
3: 'Pharmacy'
}
class Location(models.Model):
food = models.ForeignKey(Food, on_delete=models.CASCADE)
store = models.ForeignKey(Store, on_delete=models.CASCADE)
aisle = models.SmallIntegerField(choices=MEASUREMENT_CHOICES) # option descriptions depend on selected store object
Any ideas would be greatly appreciated. I like Django a lot so far, but this is my first time using it, so I'm fumbling a bit.

Answer 1

Try this. It'll allow you to store multiple Aisles within a Store, then assign every Food to multiple Aisles using a many-to-many relationship.
class Store(models.Model):
name = models.CharField(max_length=100)
class Aisle(models.Model):
name = models.CharField(max_length=100)
store = models.ForeignKey(Store)
class Food(models.Model):
name = models.CharField(max_length=100)
aisle = models.ManytoManyField(Aisle)
class Recipe(models.Model):
name = models.CharField()
food = models.ManyToManyField(Food)
def find_in_store(self, store):
"""
Write a method here that finds a given recipe in a store, and call it with recipe.find_in_store(store). This will be a bit of a complex function, but a naive implementation (if you are running a small-scale project) would be to loop through all Aisle objects in the given store and determine whether any Food objects needed for the Recipe can be found in the given Aisle.
"""