ruby on rails - link_to object, how do I define the path? -

let's run command

rails g scaffold movie title:string desc:text 

in generated index-file, /app/views/movies/index.html.erb, movie-objects looped this:

<% @movies.each |movie| %>   <tr>     <td><%= movie.title %></td>     <td><%= link_to 'show', movie %></td>      # , other columns   </tr> <% end %> 

i don't understand link_to 'show', movie part. in routing-file, movie-objects using resourceful routing ( resources :movies ), couldn't find out how works.

tl;dr: if create link link_to "some place", theobject, lead , how can (re)define in routing?

to explain, when use link_to "...", object, have remember ruby object-orientated, rails expects object have relevant data contained inside (if set correctly).

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objects

so if you're defining @movies = movie.all, you're getting activerecord object containing collection of movie objects inside. lay man, appear array of data objects, can cycle through using .each loop in example:

<%= @movies.each |movie| %>   ... <% end %> 

this code therefore output each object @movies collection - giving rails details needs build link_to path

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routing

if you're routing using resources :model helper, rails create series of restful routes you:

get /photos photos#index    display list of photos /photos/new photos#new  return html form creating new photo post    /photos photos#create   create new photo /photos/:id photos#show display specific photo /photos/:id/edit    photos#edit return html form editing photo patch/put   /photos/:id photos#update   update specific photo delete  /photos/:id photos#destroy  delete specific photo 

this how link_to helper know route use passing object method

hope helps