Every campaign has an end.

Drop ahoy, because it's more trouble than it's worth. This means dropping
visits, campaigns, targets.

Campaigns are better run to analytics, such as:
* https://matomo.org/docs/tracking-campaigns/
* https://matomo.org/docs/tracking-goals-web-analytics/
* https://support.google.com/analytics/answer/1012040?hl=en

app/models/admin_ability.rb

@@ -114,8 +114,6 @@ class AdminAbility
     can :manage, Splashpage, conference_id: conf_ids
     can :manage, Contact, conference_id: conf_ids
     can :manage, EmailSettings, conference_id: conf_ids
-    can :manage, Campaign, conference_id: conf_ids
-    can :manage, Target, conference_id: conf_ids
     can :manage, Commercial, commercialable_type: 'Conference',
                              commercialable_id: conf_ids
     can :manage, Registration, conference_id: conf_ids

app/models/ahoy/event.rb

@@ -1,13 +0,0 @@
-# frozen_string_literal: true
-
-module Ahoy
-  class Event < ApplicationRecord
-    include Ahoy::QueryMethods
-    self.table_name = 'ahoy_events'
-
-    belongs_to :visit
-    belongs_to :user
-
-    serialize :properties, JSON
-  end
-end

app/models/campaign.rb

@@ -1,78 +0,0 @@
-# frozen_string_literal: true
-
-class Campaign < ApplicationRecord
-  validates :name, :utm_campaign, presence: true
-
-  has_many :targets, dependent: :nullify
-  belongs_to :conference
-
-  has_paper_trail ignore: [:updated_at], meta: { conference_id: :conference_id }
-
-  ##
-  # 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

app/models/conference.rb

@@ -45,8 +45,6 @@ class Conference < ApplicationRecord
   has_many :vpositions, dependent: :destroy
   has_many :sponsorship_levels, -> { order('position ASC') }, dependent: :destroy
   has_many :sponsors, dependent: :destroy
-  has_many :targets, dependent: :destroy
-  has_many :campaigns, dependent: :destroy
   has_many :commercials, as: :commercialable, dependent: :destroy
   has_many :subscriptions, dependent: :destroy
   has_one :call_for_events, -> { where(cfp_type: 'events') }, through: :program, source: :cfps
@@ -76,8 +74,6 @@ class Conference < ApplicationRecord
   accepts_nested_attributes_for :questions, allow_destroy: true
   accepts_nested_attributes_for :vdays, allow_destroy: true
   accepts_nested_attributes_for :vpositions, allow_destroy: true
-  accepts_nested_attributes_for :targets, allow_destroy: true
-  accepts_nested_attributes_for :campaigns, allow_destroy: true
 
   mount_uploader :picture, PictureUploader, mount_on: :logo_file_name
 
@@ -640,35 +636,6 @@ class Conference < ApplicationRecord
     ]
   end
 
-  ##
-  # A map with all conference targets with progress in percent of a certain unit.
-  #
-  # ====Returns
-  # * +Map+ -> target => progress
-  def get_targets(target_unit)
-    conference_target = targets.where('unit = ?', target_unit)
-    result = {}
-    conference_target.each do |target|
-      result[target.to_s] = target.get_progress
-    end
-    result
-  end
-
-  ##
-  # A map with all conference campaigns associated with targets.
-  #
-  # ====Returns
-  # * +Map+ -> campaign => {actual, target, progress}
-  def get_campaigns
-    result = {}
-    campaigns.each do |campaign|
-      campaign.targets.each do |target|
-        result["#{target} from #{campaign.name}"] = target.get_campaign
-      end
-    end
-    result
-  end
-
   ##
   # Writes an snapshot of the actual event distribution to the database
   # Triggered each every Sunday 11:55 pm form whenever (config/schedule.rb).

app/models/target.rb

@@ -1,85 +0,0 @@
-# frozen_string_literal: true
-
-class Target < ApplicationRecord
-  include ActionView::Helpers::TextHelper
-
-  default_scope { order('due_date ASC') }
-
-  has_paper_trail ignore: [:updated_at], meta: { conference_id: :conference_id }
-
-  def self.units
-    {
-      registrations: 'Registration',
-      submissions: 'Submission',
-      program_minutes: 'Program minute'
-    }
-  end
-
-  validates :due_date, :target_count, :unit, presence: true
-  validates :target_count,
-            allow_nil: false,
-            numericality: { only_integer: true, greater_than: 0 }
-  validates :unit, allow_nil: false, inclusion: { in: Target.units.values }
-
-  belongs_to :conference
-  belongs_to :campaign
-
-  ##
-  # Returns the actual progress of the target in percent.
-  #
-  # ====Returns
-  # * +String+ -> progress in percent
-  def get_progress
-    numerator =
-      case unit
-      when Target.units[:submissions]
-        conference.program.events.where('created_at < ?', due_date).count
-      when Target.units[:registrations]
-        conference.registrations.where('created_at < ?', due_date).count
-      when Target.units[:program_minutes]
-        conference.current_program_minutes
-      else
-        0
-      end
-
-    (100 * numerator / target_count).to_s
-  end
-
-  ##
-  # Returns a hash with values of the corresponding campaign.
-  #
-  # ====Returns
-  # * +Hash+ -> target_name, campaign_name, value, unit, created_at, progress, days_left
-  def get_campaign
-    numerator = 0
-    if unit == Target.units[:submissions]
-      numerator = campaign.submissions_count
-    elsif unit == Target.units[:registrations]
-      numerator = campaign.registrations_count
-    elsif unit == Target.units[:program_minutes]
-      numerator = conference.current_program_minutes
-    end
-
-    progress = (numerator / target_count.to_f * 100).round(0).to_s
-    result = {
-      'target_name' => to_s,
-      'campaign_name' => campaign.name,
-      'value' => numerator,
-      'unit' => unit,
-      'created_at' => created_at,
-      'progress' => progress,
-      'days_left' => days_left
-    }
-    result
-  end
-
-  def to_s
-    "#{pluralize(target_count, unit)} by #{due_date}"
-  end
-
-  private
-
-  def days_left
-    (due_date - Date.today).to_i
-  end
-end

app/models/visit.rb

@@ -1,6 +0,0 @@
-# frozen_string_literal: true
-
-class Visit < ApplicationRecord
-  has_many :ahoy_events, class_name: 'Ahoy::Event'
-  belongs_to :user
-end