Which model gets the ForeignKey?

Always place the ForeignKey on the 'Many' side of the relationship. In a 'Company has many Employees' scenario, the Employee model gets the ForeignKey pointing to the Company.

Why would I ever use CASCADE?

CASCADE is useful for purely dependent data. For example, if you delete a Post, you absolutely want all the Comments on that post to be automatically destroyed to save database space.

What is related_name?

It is an optional parameter you can add to a relationship field. It changes the name of the 'reverse relation'. By default, if Author connects to Post, Django lets you find an author's posts via `author.post_set.all()`. By setting `related_name='posts'`, it becomes the much cleaner `author.posts.all()`.

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Database Relationships

Master Django's relational fields. Understand the critical differences between One-to-Many, Many-to-Many, and One-to-One relationships, and learn how to safely protect data using `on_delete` constraints.

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