Implements targets and campaigns for conference

app/models/campaign.rb

@@ -0,0 +1,77 @@
+class Campaign < ActiveRecord::Base
+  attr_accessible :name, :utm_source, :utm_medium, :utm_term,
+                  :utm_content, :utm_campaign, :target_ids
+
+  validates :name, :utm_campaign, presence: true
+
+  has_many :targets
+  belongs_to :conference
+
+  ##
+  # Returns the utm parameters formatted as url.
+  #
+  # ====Returns
+  # * +String+ -> url parameters e.g. ?utm_source=facebook
+  def url_parameters
+    kv = []
+    get_parameters.each_pair do |k, v|
+      kv += ["#{k}=#{v}"]
+    end
+    '?' + kv.join('&') unless kv.empty?
+  end
+
+  ##
+  # Returns the counted visits generated by this campaign.
+  #
+  # ====Returns
+  # * +Fixnum+ -> visits
+  def visits_count
+    Visit.where(get_parameters).where('started_at > ?', created_at).count
+  end
+
+  ##
+  # Returns the counted registrations generated by this campaign.
+  #
+  # ====Returns
+  # * +Fixnum+ -> visits
+  def registrations_count
+    events_by_name('Registered')
+  end
+
+  ##
+  # Returns the counted event submissions generated by this campaign.
+  #
+  # ====Returns
+  # * +Fixnum+ -> visits
+  def submissions_count
+    events_by_name('Event submission')
+  end
+
+  private
+
+  ##
+  # Helper method for submissions and registrations.
+  #
+  # ====Returns
+  # * +Fixnum+ -> registrations / submissions
+  def events_by_name(event_name)
+    parameters = get_parameters
+    parameters['ahoy_events.name'] = event_name
+    Visit.joins(:ahoy_events).where(parameters).where('started_at > ?', created_at).count
+  end
+
+  ##
+  # Helper method to get the parameters for queries.
+  #
+  # ====Returns
+  # * +Hash+ -> parameter => value
+  def get_parameters
+    conditions = {}
+    conditions[:utm_source] = self[:utm_source] unless self[:utm_source].blank?
+    conditions[:utm_medium] = self[:utm_medium] unless self[:utm_medium].blank?
+    conditions[:utm_term] = self[:utm_term] unless self[:utm_term].blank?
+    conditions[:utm_content] = self[:utm_content] unless self[:utm_content].blank?
+    conditions[:utm_campaign] = self[:utm_campaign] unless self[:utm_campaign].blank?
+    conditions
+  end
+end