[31] pry(main)> ‘packages‘.classify => "Package" [33] pry(main)> ‘packages‘.classify.constantize => Package [40] pry(main)> hash = {key: ‘value‘} => {:key=>"value"} [41] pry(main)> hash[:key] => "value" [42] pry(main)> hash[‘key‘] => nil [44] pry(main)> hash = {key: ‘value‘}.with_indifferent_access => {"key"=>"value"} [45] pry(main)> hash[:key] => "value" [46] pry(main)> hash[‘key‘] => "value" [47] pry(main)> hash[‘key‘] => "value" [49] pry(main)> app => #<RecommendApp _id: 539e995277616e7f74000000, created_at: 2014-06-16 07:14:26 UTC, updated_at: 2014-06-16 07:14:26 UTC, type: 1, position: 0, app_id: BSON::ObjectId(‘53970af477616e1878d40100‘)> [50] pry(main)> app.position => 0 [51] pry(main)> app.read_attribute :position => 0 [52] pry(main)> app.type => 1 [53] pry(main)> app.type_human
"constantize" and "with_indifferent_access" method,布布扣,bubuko.com
"constantize" and "with_indifferent_access" method
原文:http://www.cnblogs.com/iwangzheng/p/3800085.html