PostgreSQL specific trigram_similar lookups in Django

For a detailed exploration of Trigram Similarity, check out my previous blog.
Enhance Your Searches with PostgreSQL Trigram Similarity in Django.

Implementing trigram_similar lookups in Django ORM
First you need to enable pg_trgm extension in your PostgreSQL database to unlease the power of Trigram Similarity. To enable pg_trgm extension execute a following command in your terminal:

# Replace database_name with your actual database name
sudo -u postgres psql -d database_name -c "CREATE EXTENSION IF NOT EXISTS pg_trgm;"

Then add 'django.contrib.postgres' in settings.py file in django.

INSTALLED_APPS = [
    ...
    'django.contrib.postgres',
]

A trigram_similar lookup is given an expression and returns results that have a similarity measurement greater than the current similarity threshold. The trigram_similar lookup can be used on CharField and TextField. Here’s how to use it:

# Creating Product Table for testing TrigramSimilarity

class Product(models.Model):
    name = models.CharField(max_length=255)

    def __str__(self):
        return self.name

# Populating the Database with Sample Products

Product.objects.create(name='Espresso Machine')
Product.objects.create(name='Espresso Maker')
Product.objects.create(name='Expresso Machine')
Product.objects.create(name='Coffee Grinder')
Product.objects.create(name='Koffee Grinder')
Product.objects.create(name='Coffee Maker')
Product.objects.create(name='Cappuccino Maker')
Product.objects.create(name='Capuchino Maker')
Product.objects.create(name='French Press')
Product.objects.create(name='Frensh Press')

# Using trigram_similar lookup in Django ORM

Product.objects.filter(name__trigram_similar='Espresso')

# Result
[<Product: Espresso Machine>, <Product: Espresso Maker>, <Product: Expresso Machine>]