Ray's playground

摘要： To turn a symbol into a string, use Symbol#to_s, or Symbol#id2name, for which to_s is an alias.[代码]Output:a_symbol　　　　AnotherSymbol　　　　Yet another symbol!You usually reference a symbol by just typing ... 阅读全文

摘要： Mapping class inheritanceA simple strategy for mapping classes to database tables might be “one table for every class.” This approachsounds simple, and it works well until you encounter in... 阅读全文