added service model

app/models/service.rb

@@ -0,0 +1,38 @@
+class Service < ActiveRecord::Base
+  belongs_to :user
+  validates_uniqueness_of :uid, scope: :type
+
+  class << self
+
+    def first_from_omniauth(auth_hash)
+      @@auth = auth_hash
+      where(type: service_type, uid: options[:uid]).first
+    end
+
+    def initialize_from_omniauth(auth_hash)
+      @@auth = auth_hash
+      service_type.constantize.new(options)
+    end
+
+    private
+
+      def auth
+        @@auth
+      end
+
+      def service_type
+        "Services::#{options[:provider].camelize}"
+      end
+
+      def options
+        {
+          nickname:      auth['info']['nickname'],
+          access_token:  auth['credentials']['token'],
+          access_secret: auth['credentials']['secret'],
+          uid:           auth['uid'],
+          provider:      auth['provider'],
+          info:          auth['info']
+        }
+      end
+  end
+end

app/models/services/twitter.rb

@@ -0,0 +1,40 @@
+class Services::Twitter < Service
+  include Rails.application.routes.url_helpers
+
+  def provider
+    "twitter"
+  end
+
+  def post(answer)
+    Rails.logger.debug "posting to Twitter {'answer' => #{answer.id}, 'user' => #{self.user_id}}"
+    post_tweet answer
+  end
+
+  private
+
+    def client
+      @client ||= Twitter::REST::Client.new(
+        consumer_key: APP_CONFIG['sharing']['twitter']['consumer_key'],
+        consumer_secret: APP_CONFIG['sharing']['twitter']['consumer_secret'],
+        access_token: self.access_token,
+        access_token_secret: self.access_secret
+      )
+    end
+
+    def post_tweet(answer)
+      client.update prepare_tweet(answer)
+    end
+
+    def prepare_tweet(answer)
+      # TODO: improve this.
+      question_content = answer.question.content
+      answer_content = answer.content
+      answer_url = show_user_answer_url(
+        id: answer.id,
+        username: answer.user.screen_name
+      )
+      Rails.logger.debug "answer_url => #{answer_url}"
+      "#{question_content[0..55]}#{'…' if question_content.length > 56}" \
+        " — #{answer_content[0..55]}#{'…' if answercontent.length > 56} #{answer_url}"
+    end
+end

app/models/user.rb

@@ -20,6 +20,7 @@ class User < ActiveRecord::Base
   has_many :friends,   through: :active_relationships, source: :target
   has_many :followers, through: :passive_relationships, source: :source
   has_many :smiles
+  has_many :services
 
   SCREEN_NAME_REGEX = /\A[a-zA-Z0-9_]{1,16}\z/
   WEBSITE_REGEX = /https?:\/\/([A-Za-z.\-]+)\/?(?:.*)/i

db/migrate/20141212193625_create_services.rb

@@ -0,0 +1,14 @@
+class CreateServices < ActiveRecord::Migration
+  def change
+    create_table :services do |t|
+      t.string :type,     null: false
+      t.integer :user_id, null: false
+      t.string :uid
+      t.string :access_token
+      t.string :access_secret
+      t.string :nickname
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20141208111714) do
+ActiveRecord::Schema.define(version: 20141212193625) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -70,6 +70,17 @@ ActiveRecord::Schema.define(version: 20141208111714) do
   add_index "relationships", ["source_id"], name: "index_relationships_on_source_id", using: :btree
   add_index "relationships", ["target_id"], name: "index_relationships_on_target_id", using: :btree
 
+  create_table "services", force: true do |t|
+    t.string   "type",          null: false
+    t.integer  "user_id",       null: false
+    t.string   "uid"
+    t.string   "access_token"
+    t.string   "access_secret"
+    t.string   "nickname"
+    t.datetime "created_at"
+    t.datetime "updated_at"
+  end
+
   create_table "smiles", force: true do |t|
     t.integer  "user_id"
     t.integer  "answer_id"