Implements targets and campaigns for conference

app/models/target.rb

@@ -0,0 +1,79 @@
+class Target < ActiveRecord::Base
+  include ActionView::Helpers::TextHelper
+
+  attr_accessible :due_date, :target_count, :unit
+
+  default_scope { order('due_date ASC') }
+
+  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 = 0
+    if unit == Target.units[:submissions]
+      numerator = conference.events.where('created_at < ?', due_date).count
+    elsif unit == Target.units[:registrations]
+      numerator = conference.registrations.where('created_at < ?', due_date).count
+    elsif unit == Target.units[:program_minutes]
+      numerator = conference.current_program_hours
+    end
+    (numerator / target_count.to_f  * 100).round(0).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 = campaign.current_program_hours
+    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