module ActiveModel::Serializers::JSON

# "title" => "So I was thinking" } ] }
# { "comments" => [ { "body" => "Don't think too hard" } ],
# "title" => "Welcome to the weblog" },
# "posts" => [ { "comments" => [ { "body" => "1st post!" }, { "body" => "Second!" } ],
# "created_at" => "2006/08/01", "awesome" => true,
# => { "id" => 1, "name" => "Konata Izumi", "age" => 16,
only: :title } })
only: :body } },
include: { comments: {
user.as_json(include: { posts: {

Second level and higher order associations work as well:

# { "id" => 2, "author_id" => 1, "title" => "So I was thinking" } ] }
# "posts" => [ { "id" => 1, "author_id" => 1, "title" => "Welcome to the weblog" },
# "created_at" => "2006/08/01", "awesome" => true,
# => { "id" => 1, "name" => "Konata Izumi", "age" => 16,
user.as_json(include: :posts)

To include associations use :include:

# "permalink" => "1-konata-izumi" }
# "created_at" => "2006/08/01", "awesome" => true,
# => { "id" => 1, "name" => "Konata Izumi", "age" => 16,
user.as_json(methods: :permalink)

To include the result of some method calls on the model use :methods:

# => { "name" => "Konata Izumi", "awesome" => true }
user.as_json(except: [:id, :created_at, :age])

# => { "id" => 1, "name" => "Konata Izumi" }
user.as_json(only: [:id, :name])

the attributes included, and work similar to the +attributes+ method.
The :only and :except options can be used to limit

# "created_at" => "2006/08/01", "awesome" => true}
# => { "id" => 1, "name" => "Konata Izumi", "age" => 16,
user.as_json
user = User.find(1)

attributes.
Without any +options+, the returned Hash will include all the model's

# "created_at" => "2006/08/01", "awesome" => true } }
# => { "user" => { "id" => 1, "name" => "Konata Izumi", "age" => 16,
user.as_json(root: true)
user = User.find(1)

to +true+ as in:
This behavior can also be achieved by setting the :root option

# "created_at" => "2006/08/01", "awesome" => true } }
# => { "user" => { "id" => 1, "name" => "Konata Izumi", "age" => 16,
user.as_json

ActiveRecord::Base.include_root_in_json = true

# "created_at" => "2006/08/01", "awesome" => true}
# => { "id" => 1, "name" => "Konata Izumi", "age" => 16,
user.as_json
user = User.find(1)

option is +false+.
after the object's type. The default value for include_root_in_json
of +as_json+. If +true+, +as_json+ will emit a single root node named
The option include_root_in_json controls the top-level behavior

passed through +options+.
Returns a hash representing the model. Some configuration can be

def as_json(options = nil)
  root = if options && options.key?(:root)
    options[:root]
  else
    include_root_in_json
  end
  if root
    root = model_name.element if root == true
    { root => serializable_hash(options) }
  else
    serializable_hash(options)
  end
end

person.awesome # => true
person.age # => 22
person.name # => "bob"
person.from_json(json, true) # => #
person = Person.new
json = { person: { name: 'bob', age: 22, awesome:true } }.to_json

+true+ if the given JSON string includes a single root node.
The default value for +include_root+ is +false+. You can change it to

person.awesome # => true
person.age # => 22
person.name # => "bob"
person.from_json(json) # => #
person = Person.new
json = { name: 'bob', age: 22, awesome:true }.to_json

end
end
instance_values
def attributes

end
end
send("#{key}=", value)
hash.each do |key, value|
def attributes=(hash)

attr_accessor :name, :age, :awesome

include ActiveModel::Serializers::JSON
class Person

Sets the model +attributes+ from a JSON string. Returns +self+.

def from_json(json, include_root = include_root_in_json)
  hash = ActiveSupport::JSON.decode(json)
  hash = hash.values.first if include_root
  self.attributes = hash
  self
end