Serializers (Active Model Serializers) in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a serializer class for a User model.

Ruby on Rails

class UserSerializer < ActiveModel::Serializer
  attributes [1]
end

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

A:id, :name, :email

Bid, name, email

C[:id, :name, :email]

D'id', 'name', 'email'

Attempts:

3 left

💡 Hint

Common Mistakes

Using strings instead of symbols for attribute names.

Passing an array instead of a list of symbols.

The attributes method takes a list of symbols representing the model's fields to include in the serialized output.

2fill in blank

medium

Complete the code to add a custom method attribute to the serializer.

Ruby on Rails

class UserSerializer < ActiveModel::Serializer
  attributes :id, :name, :email, [1]

  def [1]
    object.name.upcase
  end
end

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

Aupcase_name

Buppercase_name

Cname_upper

Dname_caps

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatch between attribute name and method name.

Using invalid Ruby method names.

The custom attribute name must match the method name defined in the serializer.

3fill in blank

hard

Fix the error in the serializer to correctly include an association.

Ruby on Rails

class UserSerializer < ActiveModel::Serializer
  attributes :id, :name
  has_many [1]
end

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

A:posts

Bposts

Cpost

D:post

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the colon before the association name.

Using singular form for a has_many association.

Associations must be specified as symbols with the correct pluralization for collections.

4fill in blank

hard

Fill both blanks to define a belongs_to association with a custom serializer.

Ruby on Rails

class CommentSerializer < ActiveModel::Serializer
  attributes :id, :content
  belongs_to [1], serializer: [2]
end

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

A:user

BUserSerializer

C:post

DPostSerializer

Attempts:

3 left

💡 Hint

Common Mistakes

Using string instead of symbol for association name.

Passing serializer name as a string instead of a constant.

The belongs_to association uses the symbol for the related model and the serializer class name for custom serialization.

5fill in blank

hard

Fill in the blanks to create a serializer with conditional attributes and a custom method.

Ruby on Rails

class ProductSerializer < ActiveModel::Serializer
  attributes :id, :name, [1]

  attribute :discounted_price, if: -> { [2] }

  def discounted_price
    object.price * 0.9
  end
end

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

A:price

Bobject.on_sale?

Cobject.in_stock?

D:stock

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect attribute names.

Wrong condition lambda syntax.

The attributes list includes :price. The conditional attribute uses a lambda checking object.on_sale?.