僅在返回大於0的情況下如何顯示link_to幫助器

Question

我有這個幫助鏈接

link_to "", product_path(product, anchor: "disqus_thread"), data: { "disqus-identifier" => "#{url_for([product, {only_path: false}])}" }, class: "no-underline bold grey-text text-darken-3 margin-left"

布局：application.rb

%script{id: "dsq-count-scr", src: "https://url.disqus.com/count.js", async: "async"}

_disqus.html.erb

<div class="col-lg-8 col-lg-offset-2 big-top-space margin-bottom">
  <div id="disqus_thread"></div>
  <script>
    var disqus_shortname = 'yourname';
    var disqus_identifier = '<%= url_for([product, {only_path: false}]) %>';
    var disqus_title = '<%= product.name %>';
    var disqus_url = '<%= url_for([product, {only_path: false}]) %>';
  (function() { // DON'T EDIT BELOW THIS LINE
     var d = document, s = d.createElement('script');
     s.src = 'https://url.disqus.com/embed.js';
     s.setAttribute('data-timestamp', +new Date());
     (d.head || d.body).appendChild(s);
  })();
</script>
<noscript>Please enable JavaScript to view the <a href="https://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript>

</div>

一切正常，我得到一個數字，該數字是索引視圖中每個帖子的Disqus評論計數器，但是如果大於0 ，如何僅顯示數字？ 如果等於0，我不想在視圖中顯示。 有人知道如何解決這個問題嗎？ 非常感謝

我嘗試了這個：

將此列添加到產品comment_count：integer

我更改了_disqus.html

 <div class="col-lg-8 col-lg-offset-2 big-top-space margin-bottom">
      <div id="disqus_thread"></div>
      <script>
        var disqus_shortname = 'yourname';
        var disqus_identifier = '<%= url_for([product, {only_path: false}]) %>';
        var disqus_title = '<%= product.name %>';
        var disqus_url = '<%= url_for([product, {only_path: false}]) %>';

       var disqus_config = function () {
    this.callbacks.onNewComment = [
      function() {        
        $.ajax({
          method: "PATCH",
          url: '<%= product_path(product) %>',
          data: {increment: "comment_count"}
        })
      }
    ];
};
      (function() { // DON'T EDIT BELOW THIS LINE
         var d = document, s = d.createElement('script');
         s.src = 'https://url.disqus.com/embed.js';
         s.setAttribute('data-timestamp', +new Date());
         (d.head || d.body).appendChild(s);
      })();
    </script>
    <noscript>Please enable JavaScript to view the <a href="https://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript>

    </div>

產品控制器

def update    
    product = Product.find(params[:id])
    product.update(update_product)
  end
def update_product
  params.permit(:comment_count)
end    

來源： https : //help.disqus.com/customer/portal/articles/466258-capturing-disqus-commenting-activity-via-callbacks

但我得到這個錯誤

   Started PATCH "/products/12" for ::1 at 2017-04-12 17:44:38 -0500
Processing by ProductsController#update as */*
Parameters: {"increment"=>"comment_count", "id"=>"12"}
ShoppingCart Load (0.0ms) SELECT "shopping_carts".* FROM "shopping_carts" WH
ERE "shopping_carts"."id" = ? LIMIT 1 [["id", 102]]
Product Load (0.0ms) SELECT "products".* FROM "products" WHERE "products"."i
d" = ? LIMIT 1 [["id", 12]]
CACHE (0.0ms) SELECT "products".* FROM "products" WHERE "products"."id" = ?
LIMIT 1 [["id", "12"]]
Unpermitted parameters: increment, id
(0.0ms) begin transaction
User Load (0.0ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT
1 [["id", 1]]
(0.0ms) commit transaction
Rendered products/update.haml within layouts/application (0.0ms)
(0.0ms) SELECT COUNT(*) FROM "products" INNER JOIN "in_shopping_carts" ON "p
roducts"."id" = "in_shopping_carts"."product_id" WHERE "in_shopping_carts"."shop
ping_cart_id" = ? [["shopping_cart_id", 102]]
Rendered partials/_unlogged.haml (15.5ms)
Rendered partials/_nav.haml (765.8ms)
Completed 200 OK in 3476ms (Views: 3448.8ms | ActiveRecord: 0.0ms)

不允許的參數：增量，ID

在控制台中

comment_count：無

有人可以幫助我嗎？

Answer 1

我認為可以解決此問題的最佳方法是：

• 向您的數據庫添加一個comment_count屬性
• 添加disqus onNewComment回調以更新記錄中的評論計數。

使用Javascript，您可以添加回調：

var disqus_config = function () {
    this.callbacks.onNewComment = [
      function() {
        alert(comment.id);
        alert(comment.text);
        $.ajax({
          method: "PATCH",
          url: "<%= product_path(product) %>",
          data: {increment: "comment_count"}
        })
      }
    ];
};

那么您將知道以后的評論數。

文檔： https : //help.disqus.com/customer/portal/articles/466258-capturing-disqus-commenting-activity-via-callbacks

將您的控制器更改為：

def update    
  product = Product.find(params[:id])
  if params[:comment_count]
    product.increment!(:comment_count)
  else
    product.update(update_product)
  end
end

Answer 2

您不能-至少不是您嘗試的方式。

link_to "", product_path(product, anchor: "disqus_thread"), data: { "disqus-identifier" => "#{url_for([product, {only_path: false}])}" }, class: "no-underline bold grey-text text-darken-3 margin-left"

在將頁面發送到瀏覽器之前，將在Rails服務器上對此進行評估。

<script>
    var disqus_shortname = 'yourname';
    var disqus_identifier = '<%= url_for([product, {only_path: false}]) %>';
    var disqus_title = '<%= product.name %>';
    var disqus_url = '<%= url_for([product, {only_path: false}]) %>';
  (function() { // DON'T EDIT BELOW THIS LINE
     var d = document, s = d.createElement('script');
     s.src = 'https://url.disqus.com/embed.js';
     s.setAttribute('data-timestamp', +new Date());
     (d.head || d.body).appendChild(s);
  })();
</script>

此javascript稍后將在客戶端（用戶瀏覽器）中運行-此時服務器已經發送了該頁面。

如果您想知道在服務器端進行渲染時是否有任何注釋，則需要從服務器調用Disqus API 。