Add scopes and authorization models

app/models/authorization.rb

+class Authorization < ActiveRecord::Base
+  belongs_to :user
+  belongs_to :o_auth_application
+  has_and_belongs_to_many :scopes
+
+  # TODO: Incomplete class
+end

app/models/o_auth_application.rb

 class OAuthApplication < ActiveRecord::Base
   belongs_to :user
 
+  has_many :authorizations
+
   validates :client_id, presence: true, uniqueness: true
   validates :client_secret, presence: true
 

app/models/scope.rb

+class Scope < ActiveRecord::Base
+  has_and_belongs_to_many :tokens
+  has_and_belongs_to_many :authorizations
+
+  validates :name, presence: true, uniqueness: true
+
+  # TODO: Incomplete class
+end

app/models/token.rb

 class Token < ActiveRecord::Base
   belongs_to :user
+  has_and_belongs_to_many :scopes
 
   before_validation :setup, on: :create
 

app/models/user.rb

@@ -77,6 +77,7 @@ class User < ActiveRecord::Base
   has_many :reports
 
   has_many :o_auth_applications
+  has_many :authorizations
   has_many :tokens
 
   before_save :guard_unconfirmed_email,

db/migrate/20150708153926_create_authorizations.rb

+class CreateAuthorizations < ActiveRecord::Migration
+  def change
+    create_table :authorizations do |t|
+      t.belongs_to :user, index: true
+      t.belongs_to :o_auth_application, index: true
+
+      t.timestamps null: false
+    end
+  end
+end

db/migrate/20150708154727_create_scope.rb

+class CreateScope < ActiveRecord::Migration
+  def change
+    create_table :scopes do |t|
+      t.string :name
+
+      t.timestamps null: false
+    end
+  end
+end

db/migrate/20150708155202_create_authorizations_scopes_join_table.rb

+class CreateAuthorizationsScopesJoinTable < ActiveRecord::Migration
+  def change
+    create_table :authorizations_scopes, id: false do |t|
+      t.belongs_to :authorization, index: true
+      t.belongs_to :scope, index: true
+    end
+  end
+end

db/migrate/20150708155747_create_scopes_tokens_join_table.rb

+class CreateScopesTokensJoinTable < ActiveRecord::Migration
+  def change
+    create_table :scopes_tokens, id: false do |t|
+      t.belongs_to :scope, index: true
+      t.belongs_to :token, index: true
+    end
+  end
+end