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Sample code from my Using OO to Manage Control Flow post
class Credential
include ActiveModel::Validations
attr_accessor :screen_name, :oauth_token, :oauth_secret, :token, :description
validates_presence_of :screen_name, :oauth_token, :oauth_secret, :message => 'required'
validate :user_exists, :unless => :errors?
def initialize(attributes = {})
attributes.each {|k, v| set_recognized_attribute(k, v) }
end
def save
valid? && create_device
end
def as_json(options = {})
{:api_key => @device.api_key}
end
private
def errors?
errors.any?
end
def set_recognized_attribute(name, value)
setter_method = "#{name}="
self.send(setter_method, value) if respond_to?(setter_method)
end
def user
@user ||= User.by_screen_name(screen_name).where({
:oauth_token => oauth_token,
:oauth_secret => oauth_secret
}).first
end
def create_device
@device = Device.find_or_create_by_token!({
:token => token,
:description => description,
:user_id => user.id
})
!@device.nil?
end
def user_exists
errors.add(:user, 'not found') unless user.present?
end
end
class CredentialsController < ApplicationController
def create
credential = Credential.new(params)
if credential.save
render :json => credential
else
render :json => {:error => errors_for(credential)}, :status => :unprocessable_entity
end
end
private
def errors_for(object)
object.errors.map {|k, m| "#{k} #{m}" }
end
end
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