ManyToManyField for many-to-many in Django - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a many-to-many relationship between Author and Book models.

Django

class Book(models.Model):
    title = models.CharField(max_length=100)

class Author(models.Model):
    name = models.CharField(max_length=100)
    books = models.[1](Book)

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

AOneToOneField

BForeignKey

CManyToManyField

DCharField

Attempts:

3 left

💡 Hint

Common Mistakes

Using ForeignKey instead of ManyToManyField

Using OneToOneField which is for one-to-one relations

The ManyToManyField is used to create a many-to-many relationship between models in Django.

2fill in blank

medium

Complete the code to add a related name to the ManyToManyField for reverse lookup.

Django

class Author(models.Model):
    name = models.CharField(max_length=100)
    books = models.ManyToManyField(Book, [1]='authors')

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

Arelated_name

Breverse_name

Cbackref

Drelated_query_name

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'backref' which is not a Django field option

Using 'reverse_name' which does not exist

The related_name attribute sets the name for the reverse relation from Book to Author.

3fill in blank

hard

Fix the error in the code to correctly define a many-to-many field with a through model.

Django

class Membership(models.Model):
    author = models.ForeignKey(Author, on_delete=models.CASCADE)
    book = models.ForeignKey(Book, on_delete=models.CASCADE)
    date_joined = models.DateField()

class Author(models.Model):
    name = models.CharField(max_length=100)
    books = models.ManyToManyField(Book, [1]='Membership')

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

Athrough

Brelated_name

Cthrough_model

Dintermediate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'through_model' which is not a valid attribute

Using 'related_name' instead of 'through'

The through attribute specifies the intermediate model for a many-to-many relationship.

4fill in blank

hard

Fill both blanks to create a many-to-many field with a custom through model and a related name.

Django

class Author(models.Model):
    name = models.CharField(max_length=100)
    books = models.ManyToManyField(Book, [1]='Membership', [2]='authors')

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

Athrough

Brelated_name

Crelated_query_name

Dintermediate

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing 'related_query_name' with 'related_name'

Using 'intermediate' which is not a Django attribute

Use through to specify the intermediate model and related_name for reverse lookup.

5fill in blank

hard

Fill all three blanks to define a many-to-many field with a through model, related name, and symmetrical set to False.

Django

class Author(models.Model):
    name = models.CharField(max_length=100)
    books = models.ManyToManyField(Book, [1]='Membership', [2]='authors', [3]=False)

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

Athrough

Brelated_name

Csymmetrical

Drelated_query_name

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'related_query_name' instead of 'related_name'

Forgetting to set symmetrical to False when needed

through sets the intermediate model, related_name sets reverse lookup, and symmetrical=False is used for many-to-many relations where the relation is not symmetrical (like followers).