What exactly the reverse query name in its related model in Django?-CodePudding

I got pretty much the same problem as in Django - reverse query name clash.

for the following code:

class Category(models.Model):
    title = models.CharField(max_length=255)
    featured_product = models.ForeignKey(
        'Product', on_delete=models.SET_NULL, null=True)

class Product(models.Model):
    title = models.CharField(max_length=255)
    price = models.DecimalField(max_digits=6, decimal_places=2)
    category = models.ForeignKey(Category, on_delete=models.PROTECT)

There will be an error saying:

store.Category.featured_product: (fields.E303) Reverse query name for 'store.Category.featured_product' clashes with field name 'store.Product.category'.

I know it the featured_productin Category should addrelated_name=" " to avoid this error. But since this is a many-to-one case, and I think the reverse query name for store.Category.featured_productinProductclass should be store.Product.category_set so it shouldn't have a conflict with store.Product.category.

CodePudding user response：

Even if there weren't outright clashes (with the snippet you have, the generated reverse accessors should be Product.category_set and Category.product_set), I'd say Django is trying to be helpful so you don't make mistakes regarding the reverse accessors down the line.

As you noted, you can set related_name=' ' to not create the reverse accessor at all, but I'd probably name the reverse accessor something like related_name='featured_product_for_categories'.

After all, your data model does make it possible for a product to be featured in multiple categories, and even categories it isn't part of.