forgeplus/app/models/feedback_message_history.rb

# == Schema Information
#
# Table name: feedback_message_histories
#
#  id          :integer          not null, primary key
#  feedback_id :integer
#  user_id     :integer
#  title       :string(255)
#  content     :text(65535)
#  created_at  :datetime         not null
#  updated_at  :datetime         not null
#
# Indexes
#
#  index_feedback_message_histories_on_feedback_id  (feedback_id)
#  index_feedback_message_histories_on_user_id      (user_id)
#

class FeedbackMessageHistory < ApplicationRecord

  belongs_to :feedback 
  belongs_to :user 

  before_validation :send_meessage_email, on: :create

  private 

  def send_meessage_email
    unless UserMailer.feedback_email(feedback&.user&.mail, title, content).deliver_now
      errors[:title] << '邮件发送失败！'
    end
  rescue
    errors[:title] << '邮件发送失败！'
  end

end