ruby on rails - Create a link to a defined method? -

as first rails app, i'm trying put simple blog application users can vote on posts. generated blogpost scaffold integer column (entitled "upvote") keeping track of vote count.

in blogpost model, created function:

def self.voteup   blogpost.upvote += 1 end 

on blogpost index view, i'd create link like:

link_to "vote up" self.voteup 

but doesn't seem work. possible create link method? if not, can point me in right direction accomplish this?

i assume need increment upvote column in blogspots table. redirection method controllers job , can give links controller methods only. can create method in blogposts controller this:

def upvote_blog   blogpost = blogpost.find(params[:id])   blogpost.upvote += 1   blogpost.save   redirect_to blogpost_path end 

in index page,

<% @blogposts.each |blogpost| %>   ...   <%= link_to "vote up", :action => upvote_blog, :id => blogpost.id %>   ... <% end %>