我在寻找类似codeIgniter的：

I'm looking for something like CodeIgniter's:

$this->db->last_query();

（http://$c$cigniter.com/user_guide/database/helpers.html)

推荐答案

AFAIK，有没有简单的方法来获取查询列表。但是你可以很容易地访问它们创建一个超级简单的记录。

AFAIK, there's no easy way to access the list of queries. Nonetheless you can easily get access to them creating a super simple logger.

如果您打开类的ActiveRecord :: ConnectionAdapters :: AbstractAdapter ，你会看到一个名为日志的方法。这种方法被调用的每一个查询记录的声明。默认情况下，它会记录与Rails记录器中的所有语句。

If you open the class ActiveRecord::ConnectionAdapters::AbstractAdapter you'll see a method called log. This method is invoked on each query to log the statement. By default, it logs all the statements with the Rails logger.

您可以这样做

ActiveRecord::ConnectionAdapters::AbstractAdapter.class_eval do

  attr_reader :last_query
  alias_method_chain :log, :last_query

  def log_with_last_query(sql, name, &block)
    @last_query = [sql, name]
    log_without_last_query(sql, name, &block)
  end

end

现在，你可以得到与查询

Now you can get the query with

ActiveRecord::Base.connection.last_query # => ...