obdev/app/models/employer.rb

class Employer < ApplicationRecord
  # Direct association with participants
  has_many :direct_participants, class_name: 'Participant'

  # Association through EmployerRecord
  has_many :employer_records
  has_many :indirect_participants, through: :employer_records, source: :participant

  # Association with Workers through direct_participants
  has_many :workers, through: :direct_participants

  # Other methods...
  def full_name
    "#{first_name} #{last_name}"
  end
end