Add: 新建问题推荐相关话题功能

app/controllers/asks_controller.rb

@@ -53,6 +53,8 @@ def show
     @relation_asks = Ask.normal.any_in(:topics => @ask.topics).excludes(:id => @ask.id).limit(10).desc("$natural")
     # 被邀请回答的用户
     @invites = @ask.ask_invites.includes(:user)
+    # 推荐话题,如果没有设置话题的话
+    @suggest_topics = AskSuggestTopic.find_by_ask(@ask)
     set_seo_meta(@ask.title)
 
     respond_to do |format|

app/models/ask_suggest_topic.rb

@@ -0,0 +1,23 @@
+# coding: utf-8
+class AskSuggestTopic
+  include Mongoid::Document
+
+  belongs_to :ask
+  field :topics, :type => Array, :default => []
+
+  def self.find_by_ask(ask)
+    return [] if !ask.topics.blank?
+    item = self.find_or_initialize_by(:ask_id => ask.id)
+    return item.topics if !item.topics.blank?
+
+    # 生成内容
+    words = Ask.mmseg_text(ask.title)
+    topics = Topic.any_in(:name => words)
+    topics.sort { |a,b| b.followers_count <=> a.followers_count }
+    topics_array = topics.collect { |t| t.name }
+
+    item.topics = topics_array
+    item.save
+    return item.topics
+  end
+end

app/views/asks/show.html.erb

@@ -2,6 +2,7 @@
   <script type="text/javascript">
     var ask_id = '<%= @ask.id %>';
     var ask_redirected = false;
+
   </script>
 <% end %>
 <%= render 'base' %>
@@ -16,6 +17,11 @@
     Asks.redirected_tip('<%= @r_ask.title %>', '<%= @r_ask.id %>','nr', '<%= @ask.id %>');
   </script>
 <% end %>
+<% if !@suggest_topics.blank? %>
+  <script type="text/javascript">
+    Asks.showSuggestTopics(<%=raw @suggest_topics.to_json %>);
+  </script>
+<% end %>
 <div class="ask the-ask" id="ask_<%= @ask.id %>">
   <div class="topics">
     <div class="item_list">

public/javascripts/application.js

@@ -171,6 +171,17 @@ var App = {
     return false;
   },
 
+  /**
+   * Get Rails CSRF key and value
+   * result:
+   * { key : "", value : "" }
+   */
+  getCSRF : function(){
+    key = $("meta[name=csrf-param]").attr("content");
+    value = $("meta[name=csrf-token]").attr("content");
+    return { key : key, value : value };
+  },
+
   varsion : function(){
     return "1.0";
   }

public/javascripts/asks.js

@@ -530,6 +530,44 @@ var Asks = {
     return false;
   },
 
+  showSuggestTopics : function(topics){
+    html = '<div id="ask_suggest_topics" class="ask"><div class="container"><label>根据您的问题，我们推荐了一些话题（点击添加）:</label>';
+    for(var i=0;i<topics.length;i++) {
+      html += '<a href="#" class="topic" onclick="return Asks.addSuggestTopic(this,\''+topics[i]+'\');">'+topics[i]+'</a>';
+    }
+    html += '<a class="gray_button small" href="#" onclick="return Asks.closeSuggestTopics();">完成</a>';
+    html += "</div></div>";
+    $("#main").before(html);
+  },
+
+  addSuggestTopic : function(el,name){
+    App.loading();
+    var csrf = App.getCSRF();
+    $.ajax({
+      url : "/asks/"+ask_id+"/update_topic.js?"+ csrf.key + "=" + csrf.value,
+      data : {
+        name : name,
+        add : 1
+      },
+      dataType : "text",
+      type : "post",
+      success : function(res){
+        App.loading(false);
+        Asks.addTopic(name);
+        $(el).remove();
+        if($("#ask_suggest_topics a.topic").length == 0){
+          $("#ask_suggest_topics").remove();
+        }
+      }
+    });
+    return false;
+  },
+
+  closeSuggestTopics : function(){
+    $("#ask_suggest_topics").fadeOut("fast",function(){ $(this).remove(); });
+    return false;
+  },
+
   version : function(){
   }
 

public/stylesheets/application.css

@@ -261,6 +261,11 @@ address, blockquote { font-style: normal; padding: 0 0 0 10px; border-left: 3px
   padding: 5px 10px; z-index: 101;}
 #redirected_tip label { margin-left:70px; }
 
+#ask_suggest_topics { background: #FFC; border-bottom: 3px solid #CC9;
+  font-size: 12px; padding: 5px 10px; z-index: 101;}
+#ask_suggest_topics label { margin-left:70px; }
+#ask_suggest_topics a.topic { margin:0 5px; font-weight:bold; }
+
 #ask_invited_users { }
 #ask_invited_users .invite { background: #F5F5F5; border-bottom: 1px solid #E0E0E0; float: left; margin: 3px 3px 0 0;
   -moz-border-radius: 3px; -webkit-border-radius: 3px;