acts_as_votable thumbs up/down buttons

问题:

I installed the acts_as_votable gem, it works in the console like it should (like it says in the documentation). So my question is how to set up a form for upvote and downvote buttons? or can they simply be links?

here is the documentation: github.com/ryanto/acts_as_votable/blob/master/README.markdown

I have a user and a picture model; the user is supposed to be able to like the picture. code from the picture view, where the buttons should be:

<% for picture in @pictures %> 
<p> 
<%= image_tag picture.image_url(:thumb).to_s %> 
</p> 
<%= picture.created_at.strftime("%a, %d %b. %Y") %>, by 
<%= link_to picture.user.name, picture.user %> 
<h2> <%= link_to picture.name, picture %></h2> 

[buttons here] 

<%= picture.votes.size %> <% end %>

thanks in advance!

回答1:

One way to do this is to add your own controller actions for up- and downvotes. I'm assuming you have a current_user method available in your controller.

# pictures_controller.rb
def upvote
  @picture = Picture.find(params[:id])
  @picture.liked_by current_user
  redirect_to @picture
end

def downvote
  @picture = Picture.find(params[:id])
  @picture.downvote_from current_user
  redirect_to @picture
end

# config/routes.rb

resources :pictures do
  member do
    put "like", to: "pictures#upvote"
    put "dislike", to: "pictures#downvote"
  end
end

# some view

<%= link_to "Upvote", like_picture_path(@picture), method: :put %>
<%= link_to "Downvote", dislike_picture_path(@picture), method: :put %>

回答2:

Here's how I ended up doing it with the acts_as_commentable gem too. So I think this should work with any object that you have comments for.

In my _comment.html.erb view

<%= link_to "Upvote", {:controller =>"comments", :action => "upvote", :id => comment.id}, :class => 'btn', method: :put %>
<%= link_to "Downvote", {:controller =>"comments", :action => "downvote", :id => comment.id}, :class => 'btn', method: :put %>

in my routes.rb file

put '/comments/:id/:action' => 'comments#upvote'
put '/comments/:id/:action' => 'comments#downvote'

Then in my comments controller

class CommentsController < ApplicationController
  before_filter :load_commentable
  before_filter :find_comment, :only => [:upvote, :downvote]



  def upvote
    current_user.upvotes @comment
    redirect_to(@comment.commentable)
  end

  def downvote
    @comment.downvote_from current_user
    redirect_to(@comment.commentable)
  end




private

  def load_commentable
    resource, id = request.path.split('/')[1, 2]
    @commentable = resource.singularize.classify.constantize.find(id)
  end

  def find_comment
    @comment = Comment.find(@commentable.id)
  end


end

The before filters allow for more versatility so I can add this to any commentable object. Mine happened to be festivals, but you could do pictures or anything really. Check out the acts_as_commentable documentation and the polymorphic railscast for more information on that. This is my first post so if this is terrible code, just tell me.