restful routes in a polymorphic association

rubyonrails-talk
1

Hello, I have an Entry model with polymorphic associations with all kinds of contents, like notes, addresses, etc.

Class Entry < ActiveRecord::Base   belongs_to :content, :polymorphic => true end

Class Note < ActiveRecord::Base   has_one :entry, :as => :content end

Class Address < ActiveRecord::Base   has_one :entry, :as => :content end

Now, I am trying to follow the RESTful path, so in routes.rb I have: map.resources :entries, :notes, :addresses, ...

I have an index action in entries_controller that retrieves all @entries and, finally, index.rhtml has the following:

<table> <tr><th>Type</th><th>Title</th></tr> <% for entry in @entries %> <tr> <td><%= entry.content_type %></td> <td><%= link_to entry.content.title, entry_path(entry) %></td> </tr> <% end %> </table>

BUT--here's the thing. I DON'T really want entry_path to generate the linked URL. Rather, I would very much like each individual entry's content type to determine routing. Thus, for example, if entry.content_type is "Note", then I would like notes_controller actions to be invoked, as if I had written the following: <%= link_to entry.content.title, note_path(entry.content_id) %>

Does this make sense? At the very least I am sure the question is going to give away my poor knowledge of Ruby...

Many thanks in advance, Giuseppe Bertini

2

...I mean, of course I could simply do:

<%= link_to entry.content.title, "/notes/#{entry.content_id} %>

but I'd rather not, of course...

I guess my question may boil down to the following. Is it possible in Ruby to place a method call by putting together a string at runtime and having it executed? In this particular case the string might look like: s = "#{entry.content_type}_path(#{entry.content_id})"

Thanks again in advance Giuseppe

3

Giuseppe írta:

...I mean, of course I could simply do:

<%= link_to entry.content.title, "/notes/#{entry.content_id} %>

but I'd rather not, of course...

I guess my question may boil down to the following. Is it possible in Ruby to place a method call by putting together a string at runtime and having it executed? In this particular case the string might look like: s = "#{entry.content_type}_path(#{entry.content_id})"   

sure: s = eval("#{entry.content_type}_path(#{entry.content_id})")