tracks visits from different email templates

app/controllers/application_controller.rb

@@ -11,6 +11,7 @@ class ApplicationController < ActionController::Base
 
   before_action :ensure_signup_complete
   before_action :set_locale
+  before_action :track_email_campaign
 
   check_authorization unless: :devise_controller?
   self.responder = ApplicationResponder
@@ -107,4 +108,11 @@ class ApplicationController < ActionController::Base
         redirect_to(account_path, notice: t('verification.redirect_notices.already_verified'))
       end
     end
+
+    def track_email_campaign
+      if params[:track_id]
+        campaign = Campaign.where(track_id: params[:track_id]).first
+        ahoy.track campaign.name if campaign.present?
+      end
+    end
 end

app/models/campaign.rb

@@ -0,0 +1,2 @@
+class Campaign < ActiveRecord::Base
+end

db/migrate/20151020135111_create_campaigns.rb

@@ -0,0 +1,10 @@
+class CreateCampaigns < ActiveRecord::Migration
+  def change
+    create_table :campaigns do |t|
+      t.string :name
+      t.string :track_id
+
+      t.timestamps null: false
+    end
+  end
+end

db/schema.rb

@@ -12,7 +12,6 @@
 # It's strongly recommended that you check this file into your version control system.
 
 ActiveRecord::Schema.define(version: 20151021113348) do
-
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -48,6 +47,13 @@ ActiveRecord::Schema.define(version: 20151021113348) do
   add_index "ahoy_events", ["user_id"], name: "index_ahoy_events_on_user_id", using: :btree
   add_index "ahoy_events", ["visit_id"], name: "index_ahoy_events_on_visit_id", using: :btree
 
+  create_table "campaigns", force: :cascade do |t|
+    t.string   "name"
+    t.string   "track_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
   create_table "comments", force: :cascade do |t|
     t.integer  "commentable_id"
     t.string   "commentable_type"

lib/tasks/campaigns.rake

@@ -0,0 +1,8 @@
+namespace :campagins do
+
+  desc "Recalculates all the comment counters for debates and proposals"
+  task create: :environment do
+    3.times { |i| Campaign.create!(name: "Campaign#{i+1}", track_id: rand(2**32..2**64)) }
+  end
+
+end

spec/factories.rb

@@ -268,4 +268,9 @@ FactoryGirl.define do
     started_at DateTime.now
   end
 
+  factory :campaign do
+    sequence(:name) { |n| "Campaign #{n}" }
+    sequence(:track_id) { |n| "#{n}" }
+  end
+
 end

spec/features/campaigns_spec.rb

@@ -0,0 +1,33 @@
+require 'rails_helper'
+
+feature 'Email campaigns' do
+
+  background do
+    @campaign1 = create(:campaign)
+    @campaign2 = create(:campaign)
+
+    admin = create(:administrator)
+    login_as(admin.user)
+  end
+
+  scenario "Track email templates" do
+    3.times { visit root_url(track_id: @campaign1.track_id) }
+    5.times { visit root_url(track_id: @campaign2.track_id) }
+
+    visit admin_stats_path
+
+    expect(page).to have_content "#{@campaign1.name} (3)"
+    expect(page).to have_content "#{@campaign2.name} (5)"
+  end
+
+  scenario "Do not track erroneous track_ids" do
+    visit root_url(track_id: @campaign1.track_id)
+    visit root_url(track_id: "999")
+
+    visit admin_stats_path
+
+    expect(page).to have_content "#{@campaign1.name} (1)"
+    expect(page).to_not have_content "#{@campaign2.name}"
+  end
+
+end