Question

Imagine you have this model:

class Category(models.Model):
      node_id = models.IntegerField(primary_key = True)
      type_id = models.IntegerField(max_length = 20)
      parent_id = models.IntegerField(max_length = 20)
      sort_order = models.IntegerField(max_length = 20)
      name = models.CharField(max_length = 45)
      lft = models.IntegerField(max_length = 20)
      rgt = models.IntegerField(max_length = 20)
      depth = models.IntegerField(max_length = 20)
      added_on = models.DateTimeField(auto_now = True)
      updated_on = models.DateTimeField(auto_now = True)
      status = models.IntegerField(max_length = 20)
      node = models.ForeignKey(Category_info, verbose_name = 'Category_info', to_field = 'node_id'

The important part is the foreignkey.
When I try:

Category.objects.filter(type_id = 15, parent_id = offset, status = 1)

I get an error that get returned more than category, which is fine, because it is supposed to return more than one. But I want to filter the results trough another field, which would be type id (from the second Model)

Here it is:

class Category_info(models.Model):
      objtree_label_id = models.AutoField(primary_key = True)
      node_id = models.IntegerField(unique = True)
      language_id = models.IntegerField()
      label = models.CharField(max_length = 255)
      type_id = models.IntegerField()

The type_id can be any number from 1 – 5. I am desparately trying to get only one result where the type_id would be number 1.

Here is what I want in sql:

SELECT c.*, ci.*
FROM category c
JOIN category_info ci ON (c.node_id = ci.node_id)
WHERE c.type_id = 15 AND c.parent_id = 50 AND ci.type_id = 1

Any help is GREATLY appreciated.

Regards

Answer 1

Ok so…

select_related() together with the underscore thingy worked well…