从Rails 3中的活动记录查询中检索SQL查询

Question

我如何跟踪我的Activerecord方法生成了哪个SQL查询（例如，find，where）。

Answer 1

You can debug ActiveRecord queries from a console.

Hit rails console and enter:

ActiveRecord::Base.logger = Logger.new(STDOUT)

Answer 2

I assume you're using Rails 3.0.x, you can do that by configuring your active record. Put this in config/environments/development.rb

# Log ActiveRecord
ActiveRecord::Base.logger = Logger.new(STDOUT) if defined?
Rails::Console

Now, every query is explained in console.

Answer 3

您可以在关系对象上调用to_sql （类似于调用where时返回的对象），以获取这些查询的SQL。

Answer 4

If you want to do it permanently (always show queries in console) just add those files:

~/.rvmrc

railsrc_path = File.expand_path('~/.railsrc')
if ( ENV['RAILS_ENV'] || defined? Rails ) && File.exist?( railsrc_path )
  begin
    load railsrc_path
  rescue Exception
    warn "Could not load: #{ railsrc_path }" # because of $!.message
  end
end

~/.railsrc

require 'active_record'

ActiveRecord::Base.logger = Logger.new(STDOUT)
ActiveRecord::Base.clear_active_connections!