如何使用Mongoid驱动在Rails测试环境中启用Mongo索引？

test:
  clients:
    default:
      database: myapp_test
      hosts:
        - localhost:27017
      options:
        # 可选的MongoDB连接选项

# config/environments/test.rb

# 启用Mongoid索引
Mongoid::Config.clients[:default][:options][:max_pool_size] = 1
Mongoid::Config.clients[:default][:options][:min_pool_size] = 1
Mongoid::Config.clients[:default][:options][:wait_queue_timeout] = 1
Mongoid::Config.clients[:default][:options][:max_idle_time] = 1
Mongoid::Config.clients[:default][:options][:connect_timeout] = 1
Mongoid::Config.clients[:default][:options][:socket_timeout] = 1
Mongoid::Config.clients[:default][:options][:server_selection_timeout] = 1
Mongoid::Config.clients[:default][:options][:local_threshold] = 1
Mongoid::Config.clients[:default][:options][:heartbeat_frequency] = 1

class User
  include Mongoid::Document
  field :name, type: String
  field :email, type: String

  index({ name: 1 }) # 在name字段上创建升序索引
  index({ email: 1 }, { unique: true }) # 在email字段上创建唯一索引
end