Mapping to subobjects

[rhlobo]

Hey,
I am begging to learn ruby and I am a little "desoriented", I hope you can help me.

I've been trying to map an attribute from class User to an attribute of an attribute of class Person, but I am unable to find out how to do it.

At the end, I want the Person json/hash to be kind of specific...

class Person
  include Virtus

  attribute :first_name, String
  # attribute :phone_numbers, Array ???
end

class User < ActiveRecord::Base
  # name
  # phone_number
end

mapper = SimpleAttributeMapper::Mapper.new({
  :name => :first_name,
  # ???
})

user = User.new(:name => "Astolfo", :phone_number => "12345678")
person = mapper.map(user, Person)
person.to_json # => {:first_name=>"Astolfo", :phone_numbers => [ { :number => "12345678" } ]

Thanks in advance!

[house9]

There is no support for nested mapping on the target object, but using virtus you can do your own, something like this

class PhoneNumber 
  include Virtus

  attribute number, String
end

class Person
  include Virtus

  attribute :first_name, String
  attribute :phone_numbers, Array[PhoneNumber]

  def self.map(user)
    user_attributes = user.attributes.dup

    # add custom mapping in the hash passed to virtus
    user_attributes.merge!({
      first_name: user.name,
      phone_numbers: [ 
        { number: user.phone_number } 
      ]
    })

    # virtus will 'auto' map any attributes with the same names
    new(user_attributes)
  end
end

class User < ActiveRecord::Base
  # name
  # phone_number
end

user = User.new(:name => "Astolfo", :phone_number => "12345678")
person = Person.map(user)

[rhlobo]

Ok. Thanks for the answer =)

On Wed, Apr 2, 2014 at 5:56 PM, Jesse House notifications@github.comwrote:

There is no support for nested mapping on the target object, but using
virtus you can do your own, something like this

class PhoneNumber
include Virtus

attribute number, Stringend
class Person
include Virtus

attribute :first_name, String
attribute :phone_numbers, Array[PhoneNumber]

def self.map(user)
user_attributes = user.attributes.dup

# add custom mapping in the hash passed to virtus
user_attributes.merge!({
  first_name: user.name,
  phone_numbers: [
    { number: user.phone_number }
  ]
})

# virtus will 'auto' map any attributes with the same names
new(user_attributes)

endend
class User < ActiveRecord::Base

name

phone_numberend

user = User.new(:name => "Astolfo", :phone_number => "12345678")person = Person.map(user)

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