Update and Delete Operations

In this chapter, we'll begin updating and deleting records from the database.

Deleting Records

python
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def delete_content(request):
    all_notes = Note.objects.all()
    for i in all_notes:
        i.delete()
    return HttpResponse('Notes deleted')

1. all_notes = Note.objects.all(): Retrieves all Note objects from the database;

2. for i in all_notes:: Iterates through all Note objects in the QuerySet;

3. i.delete(): Deletes each Note object from the database;

4. return HttpResponse('Notes deleted'): Returns an HTTP response with the text message "Notes deleted".

Updating Records

python
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def update_content(request):
    all_notes = Note.objects.all()
    for note in all_notes:
        note.title = 'LOL'
        note.save()
    return HttpResponse('Notes updated')

1. all_notes = Note.objects.all(): Retrieves all Note objects from the database;

2. for note in all_notes:: Iterates through all Note objects in the QuerySet;

3. note.title = 'LOL': Sets a new value for the title field of each Note object;

4. note.save(): Saves the changes to the database;

5. return HttpResponse('Notes updated'): Returns an HTTP response with the text message "Notes updated".

Please note that in update_content, we are changing the title field of each Note object to the value 'LOL'. You can adapt this code according to your specific requirements.