obdev/app/models/worker.rb

class Worker < ApplicationRecord
  # One-to-many relationship with Employments
  has_many :employments

  # Many-to-many relationship with Participants through Employments
  has_many :participants, through: :employments

  # Many-to-many relationship with Employers through Participants
  has_many :employers, through: :participants, source: :employer
  has_many :employer_records, through: :participants

  # Validations
  validates :first_name, presence: true
  validates :last_name, presence: true
  validates :ssn, uniqueness: true, allow_blank: true, presence: true

  # Method to return the full name of the worker
  def full_name
    "#{first_name} #{last_name}"
  end
end