My database has the following schema:
class Product(models.Model):passclass Tag(models.Model):product = models.ForeignKey(Product)attr1 = models.CharField()attr2 = models.CharField()attr3 = models.CharField()class AlternatePartNumber(models.Model):product = models.ForeignKey(Product)
In other words, a Product
has many Tag
s, and a Product
has many AlternatePartNumber
s. Tag
s are a collection of attributes of the Product
.
Given the three attributes in a Tag
, I want to select the associated Product
s that match (could be more than one), as well as all of the AlternatePartNumber
s of each product.
Currently I do this:
# views.py
results = Tag.objects.filter(attr1=attr1).filter(attr2=attr2).filter(attr3=attr3)# a template
{% for result in results %}{% for alternate in result.product.alternatepartnumber_set.all %}{{ alternate.property }}{% endfor %}
{% endfor %}
This can run thousands of queries, depending on the number of matches. Is there a good way to optimize this? I tried using Tag.objects.select_related().filter...
and that helped some, but it didn't help enough.