rubygems - How do you use a Rails 3 gem method to update a database model? -

i using thumb_up gem ruby on rails. https://github.com/brady8/thumbs_up

i want users able vote on posts. however, unable figure out how can allow user click button next each post , add vote database.

i can happen in rails console through doing following:

u=user.first  m=micropost.first  u.vote_for(m) 

however, how can happen when button clicked in view. assuming have use ajax, how know url need post to make action occur?

any appreciated.

update:

thanks help! still having problem code below.

here routes.rb

resources :microposts   post :vote, :on => :member end 

view:

<%= link_to('vote post!', vote_micropost_path(@micropost), :method => :post) %> 

controller:

def vote     @micropost = micropost.find(params[:id])   current_user.vote_for @micropost    # assumes you'll call via ajax.   # if ajax call doesn't return "ok", know went wrong   render :text => 'ok', :layout => false end 

however, i'm still getting error: no route matches {:controller=>"microposts", :id=>#, :action=>"vote"}

would know why routes aren't matching correctly?

i assuming rails 3. rails 2's routes little different.

first need define route in config/routes.rb file. many ways. if have route microposts, add "vote" action:

    resources :microposts       post :vote, :on => :member     end 

(for clarity, "post" above refers http post method , has nothing micropost class.) if use route, need create "vote" method in microposts controller catch it. like

    def vote       @post = micropost.find(params[:id])       current_user.vote_for @post        # assumes you'll call via ajax.       # if ajax call doesn't return "ok", know went wrong       render :text => 'ok', :layout => false     end 

then in view's ajax post call (assuming example route gave), url with:

    vote_micropost_path(@micropost) 

it /microposts/56/vote