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我不知道我错过了什么。我在另一篇文章中看到 gmaps4rails gem 包含一些处理 json 的 javascripts 代码，并且在我的页面呈现的代码中它没有出现。地图的容器窗口是空白的，里面没有任何地图。我正在运行 rails 3.2.8、ruby 1.9.3 和 gmaps4rails 1.5.5。提前致谢。

控制器代码

respond_to :json, :html

def mostrar_mapa_unidades
  @json = Unidade.all.to_gmaps4rails
  respond_with @json
end

查看代码

<%= gmaps4rails(@json) %>
<%= @json %>

型号代码

acts_as_gmappable :process_geocoding => false

application.html.erb 代码

<!DOCTYPE html>
<html>
<head>
    <title>SONep</title>
    <%= stylesheet_link_tag :all %>
    <%= javascript_include_tag :defaults %>
    <%= csrf_meta_tag %>
</head>
<body>
<%= yield %>
<%= yield :scripts %>
</body>
</html>

渲染的网页代码（主要部分）

<link href="/assets/gmaps4rails.css?body=1" media="screen" rel="stylesheet" type="text/css" />
<script src="/assets/jquery.js?body=1" type="text/javascript"></script>
<script src="/assets/jquery_ujs.js?body=1" type="text/javascript"></script>
<script src="/assets/gmaps4rails/gmaps4rails.base.js?body=1" type="text/javascript"></script>
<script src="/assets/gmaps4rails/gmaps4rails.bing.js?body=1" type="text/javascript"></script>
<script src="/assets/gmaps4rails/gmaps4rails.googlemaps.js?body=1" type="text/javascript"></script>
<script src="/assets/gmaps4rails/gmaps4rails.mapquest.js?body=1" type="text/javascript"></script>
<script src="/assets/gmaps4rails/gmaps4rails.openlayers.js?body=1" type="text/javascript"></script>


<div class="map_container"> 
  <div id="map" class="gmaps4rails_map"></div>
</div>

@json

[{&quot;lat&quot;:&quot;-23.701613&quot;,&quot;lng&quot;:&quot;-46.547077&quot;},{&quot;lat&quot;:&quot;-23.704757&quot;,&quot;lng&quot;:&quot;-46.545274&quot;},{&quot;lat&quot;:&quot;-23.7074712&quot;,&quot;lng&quot;:&quot;-46.5419723&quot;}]
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