See all hits to MongoDB inside irb

mongo_inspector.rb

# 1. Paste this in console

def show_mongo_db_operations
  if Moped.logger == Rails.logger
    Moped.logger = Logger.new($stdout)
    true
  else
    Moped.logger = Rails.logger
    false
  end
end

# 2. Call show_mongo_db_operations
# 3. Run some operations to see details..

YourModel.create_indexes
YourModel.last.update_attributes! name: "Test"