> For the complete documentation index, see [llms.txt](https://olee-tech.gitbook.io/django/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://olee-tech.gitbook.io/django/django-orm/model-relationships-and-related-names/reverse-relationships.md).

# Reverse Relationships

In Django, you can define reverse relationships to access related objects from the reverse side of a ForeignKey or ManyToManyField relationship. Let's create a simple example using the `Author` and `Book` models to demonstrate reverse relationships.

**1. Create the `Author` and `Book` models:**

```python
from django.db import models

class Author(models.Model):
    name = models.CharField(max_length=100)

class Book(models.Model):
    title = models.CharField(max_length=200)
    author = models.ForeignKey(Author, on_delete=models.CASCADE)

```

In this example:

* We have two models: `Author` and `Book`.
* Each `Book` has a foreign key relationship with an `Author`, meaning each book is authored by a specific author.

**2. Create and retrieve Author and Book objects:**

```python
# Create authors
author1 = Author.objects.create(name="J.K. Rowling")
author2 = Author.objects.create(name="George Orwell")

# Create books by associating them with authors
book1 = Book.objects.create(title="Harry Potter and the Sorcerer's Stone", author=author1)
book2 = Book.objects.create(title="1984", author=author2)
book3 = Book.objects.create(title="Harry Potter and the Chamber of Secrets", author=author1)

# Access books by a specific author using the reverse relationship
books_by_rowling = author1.book_set.all()

# Print the titles of books by J.K. Rowling
for book in books_by_rowling:
    print(f"Book by J.K. Rowling: {book.title}")

```

**In this code:**

* We create two authors, `J.K. Rowling` and `George Orwell`, and three books associated with these authors.
* To access the books written by a specific author (in this case, J.K. Rowling), we use the `book_set` attribute, which is automatically generated by Django for the reverse relationship from `Author` to `Book`.
* We then loop through the books written by J.K. Rowling and print their titles.

The `book_set` attribute allows you to access the related `Book` objects for a specific `Author`. You can also define a `related_name` on the ForeignKey to provide a custom name for the reverse relationship if you prefer not to use the default `modelname_set`.