ForeignKey for one-to-many in Django - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a ForeignKey field in a Django model.

Django

class Comment(models.Model):
    post = models.[1]('Post', on_delete=models.CASCADE)
    content = models.TextField()

Drag options to blanks, or click blank then click option'

AManyToManyField

BCharField

CForeignKey

DOneToOneField

Attempts:

3 left

💡 Hint

Common Mistakes

Using CharField instead of ForeignKey for relationships.

Using ManyToManyField when only one post per comment is needed.

The ForeignKey field creates a one-to-many relationship in Django models.

2fill in blank

medium

Complete the code to specify the behavior when the related object is deleted.

Django

post = models.ForeignKey('Post', on_delete=models.[1])

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ACASCADE

BSET_NULL

CPROTECT

DDO_NOTHING

Attempts:

3 left

💡 Hint

Common Mistakes

Using SET_NULL without allowing null values.

Choosing PROTECT which prevents deletion.

CASCADE deletes related comments when the post is deleted.

3fill in blank

hard

Fix the error in the ForeignKey declaration to allow null values.

Django

post = models.ForeignKey('Post', on_delete=models.CASCADE, [1]=True)

Drag options to blanks, or click blank then click option'

Adefault

Bnull

Cblank

Dunique

Attempts:

3 left

💡 Hint

Common Mistakes

Using blank=True only affects form validation, not database nullability.

Using default without a valid default value.

Setting null=True allows the ForeignKey field to be empty in the database.

4fill in blank

hard

Fill both blanks to define a ForeignKey with a related name and allow null values.

Django

post = models.ForeignKey('Post', on_delete=models.CASCADE, [1]=True, related_name='[2]')

Drag options to blanks, or click blank then click option'

Anull

Bcomments

Cblank

Dposts

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing related_name with the model name.

Forgetting to allow null if needed.

null=True allows nulls; related_name='comments' lets you access comments from a post.

5fill in blank

hard

Fill all three blanks to create a ForeignKey with CASCADE delete, allow blank input, and set a related name.

Django

post = models.ForeignKey('Post', on_delete=models.[1], blank=[2], related_name='[3]')

Drag options to blanks, or click blank then click option'

APROTECT

BTrue

Ccomments

DCASCADE

Attempts:

3 left

💡 Hint

Common Mistakes

Using PROTECT instead of CASCADE for on_delete.

Confusing blank=True with null=True.

Incorrect related_name causing reverse lookup errors.

on_delete=models.CASCADE deletes related objects; blank=True allows empty input in forms; related_name='comments' names the reverse relation.