osem-fcy/app/models/email_settings.rb

class EmailSettings < ActiveRecord::Base
  attr_accessible :send_on_registration, :send_on_accepted, :send_on_rejected,
                  :send_on_confirmed_without_registration, :registration_email_template,
                  :accepted_email_template, :rejected_email_template, :confirmed_email_template,
                  :registration_subject, :accepted_subject, :rejected_subject,
                  :confirmed_without_registration_subject,
                  :send_on_updated_conference_dates, :updated_conference_dates_subject,
                  :updated_conference_dates_template

  def get_values(conference, user, event = nil)
    h = {
      'email' => user.email,
      'name' => user.name,
      'conference' => conference.title,
      'registrationlink' => Rails.application.routes.url_helpers.register_conference_url(
                            conference.short_title, host: CONFIG['url_for_emails'])
    }

    if !event.nil?
      h['eventtitle'] = event.title
      h['proposalslink'] = Rails.application.routes.url_helpers.conference_proposal_url(
                           conference.short_title, event, host: CONFIG['url_for_emails'])
    end
    h
  end

  def generate_registration_email(conference, user)
    values = get_values(conference, user)
    template = registration_email_template
    parse_template(template, values)
  end

  def generate_accepted_email(event)
    values = get_values(event.conference, event.submitter, event)
    template = accepted_email_template
    parse_template(template, values)
  end

  def generate_rejected_email(event)
    values = get_values(event.conference, event.submitter, event)
    template = rejected_email_template
    parse_template(template, values)
  end

  def confirmed_but_not_registered_email(event)
    values = get_values(event.conference, event.submitter, event)
    template = confirmed_email_template
    parse_template(template, values)
  end

  def parse_template(text, values)
    values.each do |key, value|
      text = text.gsub "{#{key}}", value unless text.blank?
    end
    text
  end
end