Chatwoot/app/builders/messages/outgoing/normal_builder.rb

class Messages::Outgoing::NormalBuilder
  attr_reader :message

  def initialize(user, conversation, params)
    @content = params[:message]
    @private = params[:private] || false
    @conversation = conversation
    @user = user
    @fb_id = params[:fb_id]
    @attachment = params[:attachment]
  end

  def perform
    @message = @conversation.messages.build(message_params)
    if @attachment
      @message.attachment = Attachment.new(account_id: message.account_id)
      @message.attachment.file.attach(@attachment[:file])
    end
    @message.save
    @message
  end

  private

  def message_params
    {
      account_id: @conversation.account_id,
      inbox_id: @conversation.inbox_id,
      message_type: :outgoing,
      content: @content,
      private: @private,
      user_id: @user&.id,
      source_id: @fb_id
    }
  end
end