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我正在创建停车监控应用程序，尤其是对编程和 ruby​​ on rails 完全陌生。我为 Gmaps 找到了一个很棒的扩展 - Gmaps4rails。

我有几个标记在地图上显示停车场（班级地点）的位置和拥堵情况。用户（类用户）应该能够点击标记，并且在这个弹出的小信息窗口中应该有“关注”按钮，因此用户可以随时了解停车拥堵情况。

这是我的代码

模型关系

用户

has_many :parking_relationships, :foreign_key => "watcher_id",
                                 :dependent => :destroy
has_many :watching, :through => :parking_relationships, 
                                :source => :watched

地点（停车场）

has_many :reverse_parking_relationships, :foreign_key => "watched_id",
                                         :dependent => :destroy,
                                         :class_name => "ParkingRelationship"
has_many :watchers, :through => :reverse_parking_relationships,
                                :source => :watcher

停车关系 

belongs_to :watcher, :class_name => "User"
belongs_to :watched, :class_name => "Place"

地方控制器

def index
@user = current_user
@place = Place.find(params[:id])
@places = Place.all
 @json = Place.all.to_gmaps4rails do |place, marker|
  marker.infowindow render_to_string(:partial => "/places/watch_form", :locals => {       :object => place})
 end
respond_with @json

结尾

部分_watch_form.html.erb

<% unless current_user?(@user) %>
 <div id="follow_form">
  <% if current_user.watching?(@place) %>
   <%= render 'watch' %>
  <% else %>
   <%= render 'unwatch' %>
  <% end %>
 </div>
<% end %>

部分_watch.html.erb

<%= form_for current_user.parking_relationships.
                      build(:watched_id => @place.id) do |f| %>
 <div><%= f.hidden_field :watched_id %></div>
 <div class="actions"><%= f.submit "Watch" %></div>
<% end %>

部分 _unwatch.html.erb

<%= form_for current_user.parking_relationships.find_by_watched_id(@place),
         :html => { :method => :delete } do |f| %>
 <div class="actions"><%= f.submit "Unwatch" %></div>
<% end %>

数据库结构

Users name, email, etc
Places Name, address, latitude, longitude, gmaps, congestion
Parking_relationships watched_id, watcher_id

这行不通。当我单击标记时，什么也没有发生，并且“观看”或“取消观看”按钮不会出现。我建议这是因为 @places 在 Places 控制器的索引操作中。

UPDATE:
Here's the app on the web
GitRepositary https://github.com/ilyacherevkov/parking_bob
Map http://parking-bob.heroku.com/places
Watchers of the parking http://parking-bob.heroku.com/places/1,2,3 etc/watchers
Users watching parkings http://parking-bob.heroku.com/users/1,2,3 etc/watching

谢谢各位

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