Unable to get distinct results for queryset - django

Question

here is models.py
class Product(models.Model):
brand = models.ForeignKey(Brand , related_name='products')
category = models.ForeignKey('Category', verbose_name='categories', related_name='products' , default='')
parent = models.ForeignKey('self' , related_name = 'children' , null=True , blank=True)
title = models.CharField(max_length=500)
class StoreProduct(models.Model):
product = models.ForeignKey('products.Product')
category = models.ForeignKey('products.Category')
store = models.ForeignKey('Store')
class Store(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL , null=True , blank=True)
StoreName = models.CharField(max_length=50 , default = '')
items = models.ManyToManyField('products.Product', through=StoreProduct)
brand = models.ForeignKey('products.Brand' , null=True , blank=True)
City = models.CharField(max_length=50 , default = '')
Area = models.CharField(max_length=50 , default = '')
Address = models.TextField(max_length=500)
MallName = models.CharField(max_length=50 , null=True , blank=True)
slug = models.SlugField(blank=True ,unique=True)
here is views.py
queryset = StoreProduct.objects.all().distinct()
Multiple store can contain the same product and but they should appear once on the product grid page.Distinct query is not working.What can i do to show distinct values in the above case?Thanks in Advance

Answer 1

If you are using PostgreSQL, specify the level of distinction:
queryset = StoreProduct.objects.distinct('product')
you can also use it in conjunction with values(), order_by(), etc:
queryset = StoreProduct.objects.values('product').distinct()
I will suggest the following as solution but not the solution; either you choose PosgreSQL as database, specially that the newest Django version is coming with more built-in support for complex data structure, or you try make you own filter as follow (but in case you have large dataset this will be really bad):
store_product_id_list = StoreProduct.objects.values('product').distinct()
store_product_list = []
for obj in store_product_id_list:
store_product_obj = StoreProduct.objects.filter(product_id=obj.get('product')).first()
store_product_list.append(store_product_obj)
Check distinct for more examples