Code sample from my last project

RoRCodeSample.rb

class Company::DestroyService
  def initialize(company)
    @company = company
  end

  def destroy
    Company.transaction do
      Apartment::Tenant.drop @company.db_schema
      Apartment::Tenant.switch! 'public'
      @company.destroy
    end

    @company
  end
end

module CoveredPeriodCondition
  def covered_period_condition(start_date = nil, end_date = nil, attr_name = :incurred_at)
    if start_date.blank? || end_date.blank?
      {}
    else
      { attr_name => (start_date..end_date) }
    end
  end
end

class Company < ApplicationRecord
  audited

  has_and_belongs_to_many :global_users, -> { order :name, :created_at }
  belongs_to :creator, class_name: 'GlobalUser', foreign_key: :creator_id

  validates :name, presence: true, length: { maximum: 100 },
    uniqueness: {
      case_sensitive: false,
      message: 'has already been taken. Since company name is going to be part of URL (as subdomain) it must be unique.'
    }
  validates :db_schema, uniqueness: { case_sensitive: false }

  after_validation :generate_db_schema_name

  def to_s
    name
  end

  private

  def generate_db_schema_name
    if errors.empty? && new_record?
      self.db_schema = name.parameterize
    end
  end
end