Eu tenho modelo de empresa e modelo Invintaton, as empresas podem convidar outras empresas para mensagens e agora eu preciso mostrar apenas as empresas que confirmam as mensagens

class Company < ActiveRecord::Base
  has_many :sent_invitations, class_name: 'Invintation', foreign_key: 'sender_id'
  has_many :invitation_recipients, through: :sent_invitations, source: :recipient 
  has_many :incoming_invitations, class_name: 'Invintation', foreign_key: 'recipient_id'
  has_many :invitation_senders, through: :incoming_invitations, source: :sender
end 

class Invintation < ActiveRecord::Base
  belongs_to :recipient, class_name: 'Company', foreign_key: 'recipient_id'
  belongs_to :sender, class_name: 'Company', foreign_key: 'sender_id'
end

class MessagesController < ApplicationController


  def new
    @company = Company.find(params[:company_id])
    @message = @company.sent_messages.new
    @recipients = Company.joins(:invitation_recipients).where(invitation_recipients: {sender_id: @company.id, confrm: true})
  end
end

mas recebo o erro SQLite3 :: SQLException: não existe essa coluna: sent_invitations.confrm: SELECT "companies". * FROM "companies" INNER JOIN "invintations" ON "invintations". "sender_id" = "companies". "id" WHERE " sent_invitations "." confrm "= 't'

E eu sei que dessa forma mostro apenas as empresas que estavam enviando o convite, e é necessário, e incluiu um convite