I transfer a class name information (''model'', a string) using
a URL
params :id.
and I get the name using params[:id] in an controller action.
Now, how can I convert ''model'' (string) into Model (class
name) to
perform a Model.find(X)?
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Nanyang Zhan wrote:> I transfer a class name information (''model'', a string) using a URL > params :id. > and I get the name using params[:id] in an controller action. > Now, how can I convert ''model'' (string) into Model (class name) to > perform a Model.find(X)?Try this: params[:id].camelize.constantize This will turn the string "my_super_cool_model" into the constant (ie. the class) MySuperCoolModel. -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Snowman wrote:> Try this: > > params[:id].camelize.constantize > > This will turn the string "my_super_cool_model" into the constant > (ie. the class) MySuperCoolModel.it works! thanks. btw, what''s the difference between .camelize and .classify? -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
> btw, what''s the difference between .camelize and .classify?You use classify when you''re starting with the plural version (eg. the table name). So "my_super_cool_models".classify => "MySuperCoolModel" -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
I see. Thanks. Now I know how to convert a string into a relative class name, like I can make ''user'' to User. But what if I know ''object'' (string) and ''attribute''(string) when I want to get a @object.attribute? I''ll use this in helper method. -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
instance_variable_get("@#{object}").send(attribute)
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Snow Man wrote:> instance_variable_get("@#{object}").send(attribute)Thanks! -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Sorry to revive such an old post, but I saw this and had to mention something... Snow Man wrote:>> btw, what''s the difference between .camelize and .classify? > > You use classify when you''re starting with the plural version (eg. the > table name). So "my_super_cool_models".classify => "MySuperCoolModel"While that''s true, classify is sometimes incorrect. Example:>> ''email_address''.classify=> "EmailAddres" What I would suggest if you have the plural form, or if you''re not sure what form you have, is to call singularize first, then camelize. Example:>> ''email_addresses''.singularize.camelize=> "EmailAddress" -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---