conflict between mongoid and mongo (mongo-ruby-dri

Question

I need to use the two gems mongoid and mongo in my Rails app.

Any ideas to workaround this troublesome problem thanks~

gem 'mongo', '2.0.2',:git => 'git://github.com/mongodb/mongo-ruby-driver.git'
gem 'mongoid', '4.0.0'
# gem "mongo_mapper"

Error message

Bundler could not find compatible versions for gem "bson":
  In Gemfile:
    mongo (= 2.0.2) ruby depends on
      bson (~> 3.0) ruby

    mongoid (= 4.0.0) ruby depends on
      moped (~> 2.0.0) ruby depends on
        bson (~> 2.2) ruby

UPDATE

Mongoid is handy , but sometime it is sucks,

because I got error 'Client Error: Remaining data too small for BSON object,

and even I wrapped it in begin rescue block , it still break my Rails app, and stop the import data task, what the suck Mongoid is ! So I decided to give up use Mongoid to insert new records to collection , I tried to use mongo. But they are conflict in my Rails app, WTH again !

  def bulk_insert_to_collection(collection_name)
    model = collection_name.capitalize.constantize.new
    begin
      model.collection.insert(@data_in_chunk)
      # @bulk.execute
    rescue Exception=>err  
      log_error "[#{err}] File #{@file_path}: line of #{i} #{Time.now}"
    rescue Exception => err
      log_error "[#{err}] File #{@file_path}: line of #{i} #{Time.now}"
    rescue => err
       p ex
      log_error "[#{err}] File #{@file_path}: line of #{i} #{Time.now}"
    end
    # @data_in_chunk = []
  end