app/models/program.rb
class Program < ApplicationRecord
has_many :study_applications, dependent: :destroy
has_many :programs_questionnaires, dependent: :destroy
belongs_to :manager, class_name: 'Person'
has_many :questionnaires, through: :programs_questionnaires
validates :title_uk, :title_ru, :description_uk, :description_ru, :manager, presence: true
has_paper_trail
end