constantize :
Constantize tries to find a declared constant with the name specified in the string
把字串可以變成classㄟ
"Class".constantize #=> Class
還有
classify
"egg_and_hams".classify #=> "EggAndHam"
pluralize
"post".pluralize #=> "posts"
singularize
posts".singularize #=> "post"
foreign_key
"Message".foreign_key #=> "message_id"
一些method 可以幫助妳去組 controller, model class的name還是些有的沒的
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