Learn Django Web Application Development
Map URLs to deliberate actions
URL patterns should be predictable and route values should be validated before use. Views then handle the HTTP method and coordinate the work needed for a page. Keep views focused: move reusable rules into a form, model method, or service when that improves clarity.
Separate presentation and persistence
Templates render data and provide forms; models describe persisted records and relationships. The ORM expresses common queries in Python, while migrations track changes to the database schema. A well-structured feature keeps rendering concerns out of database migrations and keeps request parsing out of templates.
Validate on the server
Forms define expected fields and validation rules. Invalid submissions should preserve useful feedback without saving bad data. Browser checks can make a form friendlier, but Django must enforce the rules because requests can come from anywhere.
Protect each record operation
Authentication identifies a user; authorization determines whether that user can act on a particular record. Scope database lookups to the authorized user or apply the relevant policy before displaying, updating, or deleting data. Test the denied path as carefully as the normal path.