Cancel assignment(guard_job) by guard/admin

cancel.rb

module AdminCommand
  module GuardJobs
    class Cancel < BaseCommand

      def call
        if job.present? && job.filled?
          if current_user.guard? && current_user.id != guard_job.guard_id
            return false
          end
          guard_job.update(guard_id: nil)

          job.guard_jobs.count == job.guard_jobs.where(guard_id: nil).count do
            job.update(state: 'unfilled') do
              # send an email about job status change
            end
          end

          if current_user.admin?
            # send an email to guard
          end

          if current_user.guard?
            # send an email to admin
          end

          AdminCommand::Jobs::InviteGuards.call(guard_id: guard_job.guard_id)
          return true
        end
        return false
      end

      private

      def guard_job
        @guard_job ||= GuardJob.find(params[:id])
      end

      def job
        @job ||= guard_job.job
      end
    end
  end
end

invite_guards.rb

module AdminCommand
  module Jobs
    class InviteGuards < BaseCommand

      def call
        suitable_guards(params[:guard_id]).each do |guard|
          InvitationMailer.job_invitation_email(guard, job).deliver_later
        end
      end

      def suitable_guards(guard_id)
        job = params[:job]
        suitable_guards = AdminCommand::Jobs::FindAvailableGuards.call(job: job) if guard_id.blank?
        suitable_guards = AdminCommand::Jobs::FindAvailableGuards.call(job: job)
                            .where.not(guard_id) if guard_id.present?
      end 

    end
  end
end