所以，我已经按照这里看到的关于使用加减号列统计选票的说明进行操作，但是它不起作用。当我点击投票时，投票被添加但不根据高/低投票数排名。
song_controller.rb
class SongsController < ApplicationController
before_filter :authenticate_user!, only: [:create ,:edit, :update, :destroy, :vote_for_song]
before_action :set_song, only: [:show, :edit, :update, :destroy, :vote_for_song]
def vote_for
@song = Song.find(params[:id])
current_user.vote_for(@song)
respond_to do |format|
format.js { render 'update_votes' }
end
end
def vote_against
@song = Song.find(params[:id])
current_user.vote_against(@song)
respond_to do |format|
format.js { render 'update_votes' }
end
end
# GET /Songs
# GET /Songs.json
def index
@songs = Song.all.order("plusminus desc")
end
# GET /Songs/1
# GET /Songs/1.json
def show
@comment = Comment.new(song: @song)
end
# GET /Songs/new
def new
@song = Song.new
end
# GET /Songs/1/edit
def edit
end
# POST /Songs
# POST /Songs.json
def create
@song = Song.new(song_params)
respond_to do |format|
if @song.save
format.html { redirect_to @song, notice: 'Song was successfully created.' }
format.json { render action: 'show', status: :created, location: @song }
else
format.html { render action: 'new' }
format.json { render json: @song.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /Songs/1
# PATCH/PUT /Songs/1.json
def update
respond_to do |format|
if @song.update(song_params)
format.html { redirect_to @song, notice: 'Song was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: @song.errors, status: :unprocessable_entity }
end
end
end
# Song /Songs/1
# Song /Songs/1.json
def destroy
@song.destroy
respond_to do |format|
format.html { redirect_to songs_url }
format.json { head :no_content }
end
end
private
def set_song
@song = Song.find(params[:id])
end
def song_params
params.require(:song).permit(:title, :artist, :bio, :track, :user_id)
end
end
歌曲#index.html.erb
<div id="layout-1">
<!--div class="left-side"> -->
<h3>Songs</h3>
<ol>
<% @songs.each do |song| %>
<li><%= link_to song.title, song %><br></li>
<%=link_to '▲'.html_safe, vote_for_song_path(song), :remote => true, :method => :put %>
<%#=link_to '▼'.html_safe, vote_against_song_path(song), :remote => true, :method => :put %> |
Submitted <%= time_ago_in_words(song.created_at) + " ago" %>
<small><span class="comments"> | <%= pluralize(song.comments.size, 'comment') %></span></small> | <small><span class="votes"><%= pluralize(song.votes.count, 'like') %></span></small><br />
<%#= link_to 'Show', song, class: "button small secondary" %>
<%= link_to('Edit', edit_song_path(song), class: "button small secondary") if can? :update, song %>
<%= link_to('Destroy', song, method: :delete, data: {confirm: 'Are you sure?'}, class: "button small secondary") if can? :destroy, song %>
<% end %>
</ol>
</div>
架构.rb
ActiveRecord::Schema.define(version: 20130727163912) do
# These are extensions that must be enabled in order to support this database
enable_extension "plpgsql"
create_table "comments", force: true do |t|
t.integer "song_id"
t.string "author_name"
t.string "site_url"
t.text "content"
t.integer "user_id"
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "songs", force: true do |t|
t.string "title"
t.string "artist"
t.text "bio"
t.string "track_file_name"
t.string "track_content_type"
t.integer "track_file_size"
t.datetime "track_updated_at"
t.integer "user_id"
t.datetime "created_at"
t.datetime "updated_at"
t.integer "plusminus"
end
create_table "users", force: true do |t|
t.string "email", default: "", null: false
t.string "encrypted_password", default: "", null: false
t.string "reset_password_token"
t.datetime "reset_password_sent_at"
t.datetime "remember_created_at"
t.integer "sign_in_count", default: 0
t.datetime "current_sign_in_at"
t.datetime "last_sign_in_at"
t.string "current_sign_in_ip"
t.string "last_sign_in_ip"
t.datetime "created_at"
t.datetime "updated_at"
t.boolean "admin"
end
add_index "users", ["email"], name: "index_users_on_email", unique: true, using: :btree
add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true, using: :btree
create_table "votes", force: true do |t|
t.boolean "vote", default: false, null: false
t.integer "voteable_id", null: false
t.string "voteable_type", null: false
t.integer "voter_id"
t.string "voter_type"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "votes", ["voteable_id", "voteable_type"], name: "index_votes_on_voteable_id_and_voteable_type", using: :btree
add_index "votes", ["voter_id", "voter_type", "voteable_id", "voteable_type"], name: "fk_one_vote_per_user_per_entity", unique: true, using: :btree
add_index "votes", ["voter_id", "voter_type"], name: "index_votes_on_voter_id_and_voter_type", using: :btree
end