Complete refactor of the `Spammable` concern and tests:

app/models/concerns/akismet_submittable.rb

-module AkismetSubmittable
-  extend ActiveSupport::Concern
-
-  included do
-    has_one :user_agent_detail, as: :subject
-  end
-
-  def can_be_submitted?
-    if user_agent_detail
-      user_agent_detail.submittable?
-    else
-      false
-    end
-  end
-end

app/models/concerns/spammable.rb

 module Spammable
   extend ActiveSupport::Concern
+  include Gitlab::AkismetHelper
+
+  module ClassMethods
+    def attr_spammable(*attrs)
+      attrs.each do |attr|
+        spammable_attrs << attr.to_s
+      end
+    end
+  end
 
   included do
+    has_one :user_agent_detail, as: :subject, dependent: :destroy
     attr_accessor :spam
     after_validation :check_for_spam, on: :create
+
+    cattr_accessor :spammable_attrs, instance_accessor: false do
+      []
+    end
+  end
+
+  def can_be_submitted?
+    if user_agent_detail
+      user_agent_detail.submittable?
+    else
+      false
+    end
+  end
+
+  def submit_ham
+    return unless akismet_enabled? && can_be_submitted?
+    ham!(user_agent_detail, spammable_text, creator)
+  end
+
+  def submit_spam
+    return unless akismet_enabled? && can_be_submitted?
+    spam!(user_agent_detail, spammable_text, creator)
+  end
+
+  def spam?(env, user)
+    is_spam?(env, user, spammable_text)
   end
 
-  def spam?
+  def spam_detected?
     @spam
   end
 
   def check_for_spam
-    self.errors.add(:base, "Your #{self.class.name.underscore} has been recognized as spam and has been discarded.") if spam?
+    self.errors.add(:base, "Your #{self.class.name.underscore} has been recognized as spam and has been discarded.") if spam_detected?
+  end
+
+  private
+
+  def spammable_text
+    result = []
+    self.class.spammable_attrs.each do |entry|
+      result << self.send(entry)
+    end
+    result.reject(&:blank?).join("\n")
+  end
+
+  def creator
+    if self.author_id
+      User.find(self.author_id)
+    elsif self.creator_id
+      User.find(self.creator_id)
+    end
   end
 end

app/models/issue.rb

@@ -37,6 +37,8 @@ class Issue < ActiveRecord::Base
   scope :order_due_date_asc, -> { reorder('issues.due_date IS NULL, issues.due_date ASC') }
   scope :order_due_date_desc, -> { reorder('issues.due_date IS NULL, issues.due_date DESC') }
 
+  attr_spammable :title, :description
+
   state_machine :state, initial: :opened do
     event :close do
       transition [:reopened, :opened] => :closed

app/services/issues/create_service.rb

@@ -8,7 +8,7 @@ module Issues
       issue = project.issues.new(params)
       issue.author = params[:author] || current_user
 
-      issue.spam = spam_check_service.execute(request, api)
+      issue.spam = spam_check_service.execute(request, api, issue)
 
       if issue.save
         issue.update_attributes(label_ids: label_params)

app/services/spam_check_service.rb

 class SpamCheckService < BaseService
-  include Gitlab::AkismetHelper
+  attr_accessor :request, :api, :subject
 
-  attr_accessor :request, :api
+  def execute(request, api, subject)
+    @request, @api, @subject = request, api, subject
+    return false unless request || subject.check_for_spam?(project)
+    return false unless subject.spam?(request.env, current_user)
 
-  def execute(request, api)
-    @request, @api = request, api
-    return false unless request || check_for_spam?(project)
-    return false unless is_spam?(request.env, current_user, text)
-    
     create_spam_log
 
     true
   end
 
   private
-
-  def text
-    [params[:title], params[:description]].reject(&:blank?).join("\n")
-  end
   
   def spam_log_attrs
     {
@@ -25,9 +19,9 @@ class SpamCheckService < BaseService
       project_id: project.id,
       title: params[:title],
       description: params[:description],
-      source_ip: client_ip(request.env),
-      user_agent: user_agent(request.env),
-      noteable_type: 'Issue',
+      source_ip: subject.client_ip(request.env),
+      user_agent: subject.user_agent(request.env),
+      noteable_type: subject.class.to_s,
       via_api: api
     }
   end

lib/api/issues.rb

@@ -160,7 +160,7 @@ module API
 
         issue = ::Issues::CreateService.new(project, current_user, attrs.merge(request: request, api: true)).execute
 
-        if issue.spam?
+        if issue.spam_detected?
           render_api_error!({ error: 'Spam detected' }, 400)
         end
 

lib/gitlab/akismet_helper.rb

@@ -43,5 +43,39 @@ module Gitlab
         false
       end
     end
+
+    def ham!(details, text, user)
+      client = akismet_client
+
+      params = {
+        type: 'comment',
+        text: text,
+        author: user.name,
+        author_email: user.email
+      }
+
+      begin
+        client.submit_ham(details.ip_address, details.user_agent, params)
+      rescue => e
+        Rails.logger.error("Unable to connect to Akismet: #{e}, skipping!")
+      end
+    end
+
+    def spam!(details, text, user)
+      client = akismet_client
+
+      params = {
+        type: 'comment',
+        text: text,
+        author: user.name,
+        author_email: user.email
+      }
+
+      begin
+        client.submit_spam(details.ip_address, details.user_agent, params)
+      rescue => e
+        Rails.logger.error("Unable to connect to Akismet: #{e}, skipping!")
+      end
+    end
   end
 end

spec/factories/user_agent_details.rb

@@ -2,6 +2,8 @@ FactoryGirl.define do
   factory :user_agent_detail do
     ip_address '127.0.0.1'
     user_agent 'AppleWebKit/537.36'
+    subject_id 1
+    subject_type 'Issue'
 
     trait :on_issue do
       association :subject, factory: :issue

spec/models/concerns/spammable_spec.rb

+require 'spec_helper'
+
+describe Issue, 'Spammable' do
+  let(:issue) { create(:issue, description: 'Test Desc.') }
+
+  describe 'Associations' do
+    it { is_expected.to have_one(:user_agent_detail).dependent(:destroy) }
+  end
+
+  describe 'ClassMethods' do
+    it 'should return correct attr_spammable' do
+      expect(issue.send(:spammable_text)).to eq("#{issue.title}\n#{issue.description}")
+    end
+  end
+
+  describe 'InstanceMethods' do
+    it 'should return the correct creator' do
+      expect(issue.send(:creator).id).to eq(issue.author_id)
+    end
+
+    it 'should be invalid if spam' do
+      issue.spam = true
+      expect(issue.valid?).to be_truthy
+    end
+
+    it 'should be submittable' do
+      create(:user_agent_detail, subject_id: issue.id, subject_type: issue.class.to_s)
+      expect(issue.can_be_submitted?).to be_truthy
+    end
+  end
+
+  describe 'AkismetMethods' do
+    before do
+      allow_any_instance_of(Gitlab::AkismetHelper).to receive_messages(check_for_spam?: true, is_spam?: true, ham!: nil, spam!: nil)
+    end
+
+    it { expect(issue.spam?(:mock_env, :mock_user)).to be_truthy }
+    it { expect(issue.submit_spam).to be_nil }
+    it { expect(issue.submit_ham).to be_nil }
+  end
+end

spec/models/user_agent_detail_spec.rb

@@ -13,10 +13,5 @@ describe UserAgentDetail, type: :model do
       detail = create(:user_agent_detail, :on_issue)
       expect(detail).to be_valid
     end
-
-    it 'should not be valid without a subject' do
-      detail = build(:user_agent_detail)
-      expect(detail).not_to be_valid
-    end
   end
 end