M2M attribute error with FOO_set.all() and FOO not a queryset-CodePudding

Having a problem with a M2M related queryset: simplified model is

class Category(models.Model):
   name = models.CharField(max_length=200)

class Product(models.Model):
   name = models.CharField(max_length=200)
   category = models.ManyToManyField(
   Category, blank=True, null=True, related_name="categorytest")

I usually do related queries using related name (which works fine here no problem) yet I wanted to try "set_all()" in this case. Say I do: elecs = Category.objects.get(name="Electronics") then: elecs.product_set.all()
I get AttributeError: 'Category' object has no attribute 'product_set'. I am a bit surprised because this is an error that happens when using a queryset instead of a model instance yet, if a confirmation was needed, a type(elecs) gives me <class 'store.models.Category'>. I migrated/erased db multiple times, no change. Any idea ? Thanks

CodePudding user response：

You specify the name of the relation in reverse with the related_name=… parameter ^[Django-doc]. Since you set related_name='categorytest', you thus access these with:

elecs.categorytest.all()

But likely using categorytest is not a good idea. It might be better to specify this for example as related_name='products'.