Question

For example, I have a model like this:

Class Doggy(models.Model):
    name = models.CharField(u'Name', max_length = 40)
    color = models.CharField(u'Color', max_length = 20)

How can i select doggies with the same color? Or with the same name 🙂

UPD. Of course, I don’t know the name or the color. I want to.. kind of, group by their values.

UPD2. I’m trying to do something like that, but using Django:

SELECT * 
FROM table 
WHERE tablefield IN ( 
 SELECT tablefield
 FROM table 
 GROUP BY tablefield  
 HAVING (COUNT(tablefield ) > 1) 
) 

UPD3. I’d like to do it via Django ORM, without having to iterate over the objects. I just want to get rows with duplicate values for one particular field.

Answer 1

Okay, apparently, there’s no way to do such thing with ORM only.

If you have to do it, you have to use .extra() to execute needed SQL-statement (if you are using SQL database, of course)