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")