get() for single objects in Django - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What does get() return when the object exists?

Consider a Django model Book with a record where id=1. What does Book.objects.get(id=1) return?

Django

book = Book.objects.get(id=1)
print(type(book))

A A QuerySet containing the record with id=1

B An instance of the Book model representing the record with id=1

C A list containing the record with id=1

D None, if the record exists

💡 Hint

Remember, get() returns a single object, not a list or QuerySet.

The get() method returns a single model instance matching the query. It does not return a QuerySet or list.

🔧 Debug

intermediate

What error occurs if get() finds no matching object?

What error will this code raise if no Book with id=999 exists?

Book.objects.get(id=999)

Django

Book.objects.get(id=999)

A Book.DoesNotExist

B ValueError

C KeyError

D MultipleObjectsReturned

💡 Hint

Think about what happens when no object matches the query.

If get() finds no matching object, Django raises DoesNotExist specific to the model.

📝 Syntax

advanced

Which get() call causes MultipleObjectsReturned error?

Given multiple Book records with author='Alice', which code raises MultipleObjectsReturned?

Django

Book.objects.get(author='Alice')

A Book.objects.get(id=1)

B Book.objects.get(title='Unique Title')

C Book.objects.get(author='Alice')

D Book.objects.get(pk=999)

💡 Hint

get() expects exactly one match, not many.

If more than one object matches the query, get() raises MultipleObjectsReturned.

❓ state_output

advanced

What is the output of this get() usage with try-except?

What will this code print if no Book with id=10 exists?

try:
    book = Book.objects.get(id=10)
    print('Found:', book.title)
except Book.DoesNotExist:
    print('No book found')

Django

try:
    book = Book.objects.get(id=10)
    print('Found:', book.title)
except Book.DoesNotExist:
    print('No book found')

A No book found

B Prints nothing

C Raises MultipleObjectsReturned error

D Found: <title of book with id=10>

💡 Hint

The except block runs if get() finds no object.

The code catches the DoesNotExist error and prints 'No book found' if no matching record exists.

🧠 Conceptual

expert

Why prefer get() over filter() when expecting a single object?

Which reason best explains why get() is preferred over filter() when you expect exactly one object?

A filter() raises an error if no objects are found, while get() returns None

B filter() returns a single object directly without wrapping in a QuerySet

C get() returns a QuerySet which is easier to chain with other queries

D get() raises errors if zero or multiple objects found, helping catch unexpected data issues

💡 Hint

Think about error detection when data does not match expectations.

get() helps catch problems by raising errors if the data is missing or duplicated, unlike filter() which silently returns empty or multiple results.