Rails string字符串相关转换

总结字串转变到其它与它相关的object的方法. 在这里整理分享一下, 希望能帮助到你.

变量相关
读取
instance_variable_get("@name") #返回@name值设置
instance_variable_set("@name", "三国演义") #@name = "三国演义"

method相关
string到method名:send
book.send("name") #返回 book.name值注意: book.send("name") = "三国演义" 会出错.?但可以:
book.send("name=", "三国演义") #book.name = "三国演义"

单复数转化
string复数化:?pluralize?可用于生成table_name
"country".pluralize #=> "countries"

string单数化:?singularize?和上面的相反
"posts".singularize #=> "post"

table和class相关

将表格名转成class名:?classify
"blog_pictures".classify #=> "BlogPicture"

转成table_name(和上面的相反):?tableize
"BlogPicture".tableize #=> "blog_pictures"

将class名转成class:?constantize
"Country".constantize #=> Country

可以将classify和constantize联用将string转成class model:
"books".classify.constantize.find_by_name("三国演义")#=> Book.find_by_name("三国演义")