Testing triggers for fulltext search in Django - django

Question

I'm adding a search engine to a Django project, and thus set up SearchVectorFields on several models, with custom triggers.
I would like to unit-test that my columns of type TSVECTOR are updated when the instance of a Model changes.
However, I've been unable to find any information on how to test the content of a SearchVectorField ... I can't compare my_document.search to SearchVector(Value("document content")) or similar, because the first one seems to be string-like, while the latter is an object.
TL;DR
More precisely, with the model:
from django.db import models
class Document(models.Model):
...
content = TextField()
search = SearchVectorField()
and trigger:
-- create trigger function
CREATE OR REPLACE FUNCTION search_trigger() RETURNS trigger AS $$
begin
NEW.search := to_tsvector(COALESCE(NEW.content, ''))
return NEW;
end
$$ LANGUAGE plpgsql;
-- add trigger on insert
DROP TRIGGER IF EXISTS search_trigger ON myapp_document;
CREATE TRIGGER search_trigger
BEFORE INSERT
ON myapp_document
FOR EACH ROW
EXECUTE PROCEDURE search_trigger();
-- add trigger on update
DROP TRIGGER IF EXISTS search_trigger_update ON myapp_document;
CREATE TRIGGER search_trigger_update
BEFORE UPDATE OF content
ON myapp_document
FOR EACH ROW
WHEN (OLD.content IS DISTINCT FROM NEW.content)
EXECUTE PROCEDURE search_trigger();
How can I test that when I create a new Document instance, its search field is populated with the right values ? Same question for updating an existing Document instance, but the answer should be fairly similar.
Thanks for any hint ;)

Answer 1

I think you can compare string representation of your SearchVectorField values:
from django.test import TestCase
from .models import Document
class DocumentTest(TestCase):
def setUp(self):
Document.objects.create(content='Pizza Recipes')
def test_document_search(self):
document_list = list(Document.objects.values_list('search', flat=True))
search_list = ["'pizza':1 'recip':2"]
self.assertSequenceEqual(document_list, search_list)