Re: Queryset from 2 models with second model filtered.
Typically I simply want to do a left join but have it as an object in django rather than a sql raw query. The queryset would look like. Select a.code as 'product_code', a.description as 'product_description', b.code as 'customer_code', b.code as 'customer_description', ifnull(b.code, a.code) as 'code', ifnull(b.description, b.description) as 'description' from products a left join customerproduct b on b.product_id = a.id where b.customer_id = 'X' I know I could create a view in sql and create a model for that but I am sure there must be a nicer solution. -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-us...@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
Queryset from 2 models with second model filtered.
Hi, I have a tricky one, I don't have an error but rather trying to avoid many database hits. I am trying to build a product database which can have different field values per customer. So the model would look something like this. class Customer(models.Model): name = models.CharField(max_length = 50) class Product(models.Model): code = models.CharField(max_length = 32) description = models.CharField(max_length = 50) class CustomerProduct(models.Model): product = models.ForeignKey(Product) customer = models.ForeignKey(Customer) code = models.CharField(max_length = 32, null = True, blank = True) description = models.CharField(max_length = 50, null = True, blank = True) The CustomerProduct will only have an entry if a code or description is provided for a customer. Now ideally I would like to pull a queryset for a customer which lists all available products (Product), but if it finds that a CustomerProduct exists that it returns the CustomerProduct code and description instead of the Product code and description. Even better would be having a queryset filtered by Customer that I could have as 1 object and call the field values like x.product.code and x.customerproduct.code. Just looking for some suggestions. Thanks -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-us...@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
