fluke/devops-service/db/mongo/connectors/base.rb

require "exceptions/record_not_found"
require "exceptions/invalid_record"
require "exceptions/invalid_command"
require "exceptions/invalid_privileges"
%w(delete insert list show update).each do |command_name|
  require_relative "helpers/#{command_name}_command"
end

module Connectors
  class Base

    # если хотим создавать индексы при старте приложения, нужно сначала создать коллекцию
    def initialize db
      names = db.collection_names
      unless names.include?(self.collection_name)
        db.create_collection(self.collection_name)
        puts "Collection '#{self.collection_name}' has been created"
      end
      self.collection = db.collection(self.collection_name)
    end

    def create_indexes

    end

    def collection_name
      raise "owerride me"
    end

    # Yes, we can implement connectors without attr_accessor, storing collection directly
    # in instance variable like
    # @collection = db.collection('users')
    #
    # But with latter approach included modules should know about instance variables of
    # base classes.
    # Also, debugging "No method error" is simplier than seeking missing instance var.
  private

    attr_accessor :collection
  end
end