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liwh/gist:569586

Created September 8, 2010 03:49
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gistfile1.rb
>> New.find(1)
ActiveRecord::RecordNotFound: Couldn't find New with ID=1
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/base.rb:1591:in `find_one'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/base.rb:1574:in `find_from_ids'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/base.rb:616:in `find'
from (irb):4
>> New.find_by_id(1)
=> nil
//直接利用find方式查找，如果没有数据会跑出异常，而利用find_by_id方式会返回nil
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