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+class History

+	include Mongoid::Document

+

+	field :me, type: String

+	field :_with, type: String

+

+    embeds_many :messages, cascade_callbacks: true

+    accepts_nested_attributes_for :messages

+

+    index({ me: 1, _with: 1 }, { unique: false })

+

+    def self.find_me_with(me, with)

+        where(me: me, _with: with).limit(1).first

+    end

+

+    def self.save_message(me, from, message, chat_with, chat_id = nil)

+        _with = chat_id.blank? ? chat_with : chat_id

+        history = find_me_with(me, _with)

+

+        history = History.new(me: me, _with: _with) if history.nil?

+

+        record = Message.new(message: message, from: from)

+        history.messages << record

+

+        history.save

+    end

+end

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+class Message

+	include Mongoid::Document

+    include Mongoid::Timestamps::Created

+

+    field :message, type: String

+    field :from, type: String

+

+    embedded_in :history

+end