get() for single objects in Django - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the get() method do in Django's QuerySet?

The get() method retrieves a single object from the database that matches the given filter criteria. If no object or more than one object matches, it raises an error.

beginner

What exception does get() raise if no object matches the query?

It raises a DoesNotExist exception specific to the model class.

beginner

What happens if get() finds more than one object matching the query?

It raises a MultipleObjectsReturned exception to indicate the query was not specific enough.

beginner

How do you use get() to find a user with username 'alice'?

You write: User.objects.get(username='alice'). This returns the user object with username 'alice' or raises an error if not found or multiple found.

intermediate

Why is get() preferred over filter() when you expect only one object?

get() returns a single object directly and raises errors if the result is not exactly one, helping catch mistakes early. filter() returns a list-like QuerySet even if one or zero objects match.

What does Model.objects.get(id=1) return if exactly one object with id=1 exists?

A Raises MultipleObjectsReturned

B A list of objects with <code>id=1</code>

C An empty QuerySet

D The single object with <code>id=1</code>

get() returns the single matching object if exactly one exists.

What exception is raised by get() if no object matches the query?

A DoesNotExist

B MultipleObjectsReturned

C ValueError

D KeyError

get() raises DoesNotExist if no matching object is found.

If get() finds two objects matching the query, what happens?

A Returns the first object

B Returns a list of objects

C Raises MultipleObjectsReturned

D Returns None

get() raises MultipleObjectsReturned if more than one object matches.

Which method should you use to get exactly one object or fail with an error?

A get()

B exclude()

C all()

D filter()

get() is designed to return exactly one object or raise an error.

What is the return type of get()?

A A list

B A single model instance

C A QuerySet

D A dictionary

get() returns a single model instance, not a QuerySet or list.

Explain how Django's get() method works for retrieving single objects.

Think about what happens if zero or multiple objects match.

Describe the difference between get() and filter() in Django QuerySets.

Consider the return types and error handling.