removed last_edited from map model, and set up code to update map updated_at column whenever certain events happen that update the map

app/controllers/mappings_controller.rb

@@ -25,6 +25,7 @@ class MappingsController < ApplicationController
       if params[:map]
         if params[:map][:id]
           @map = Map.find(params[:map][:id])
+          @map.touch(:updated_at)
           @mapping.map = @map
         end
       end

app/controllers/maps_controller.rb

@@ -217,6 +217,7 @@ class MapsController < ApplicationController
         end
       end
       @map.arranged = true
+      @map.touch(:updated_at)
       @map.save
     end	
   end

app/controllers/synapses_controller.rb

@@ -41,6 +41,8 @@ class SynapsesController < ApplicationController
 	
     if params[:synapse][:map]
       @map = Map.find(params[:synapse][:map])
+      @map.touch(:updated_at)
+      
       @mapping = Mapping.new()
       @mapping.category = "Synapse"
       @mapping.user = @user
@@ -104,12 +106,14 @@ class SynapsesController < ApplicationController
     end
   end
 
-  # POST mappings/:map_id/:synapse_id/removefrommap
+  # POST synapses/:map_id/:synapse_id/removefrommap
   def removefrommap
     @user = current_user
    
     @mapping = Mapping.find_by_synapse_id_and_map_id(params[:synapse_id],params[:map_id])
     
+    Map.find(params[:map_id]).touch(:updated_at)
+    
     #push notify to anyone viewing same map in realtime (see mapping.rb to understand the 'message' action)
     @mapping.message 'destroy',@user.id
     
@@ -126,6 +130,9 @@ class SynapsesController < ApplicationController
     @synapse = Synapse.find(params[:id]).authorize_to_edit(@current)
 
     @synapse.mappings.each do |m|
+    
+      m.map.touch(:updated_at)
+      
       #push notify to anyone viewing same map in realtime (see mapping.rb to understand the 'message' action)
       m.message 'destroy',@current.id
     

app/controllers/topics_controller.rb

@@ -94,6 +94,7 @@ class TopicsController < ApplicationController
     @mapping = nil
     if params[:topic][:map]
       @map = Map.find(params[:topic][:map])
+      @map.touch(:updated_at)
       
       @mapping = Mapping.new()
       @mapping.category = "Topic"
@@ -150,12 +151,13 @@ class TopicsController < ApplicationController
     end
   end
   
-  # GET mappings/:map_id/:topic_id/removefrommap
+  # POST topics/:map_id/:topic_id/removefrommap
   def removefrommap
 	  @current = current_user
 	  @mapping = Mapping.find_by_topic_id_and_map_id(params[:topic_id],params[:map_id])
 	  
     @map = Map.find(params[:map_id])
+    @map.touch(:updated_at)
     @topic = Topic.find(params[:topic_id])
     @mappings = @map.mappings.select{|m| 
       if m.synapse != nil
@@ -194,6 +196,10 @@ class TopicsController < ApplicationController
     
       @synapses.each do |synapse| 
         synapse.mappings.each do |m|
+        
+          @map = m.map
+          @map.touch(:updated_at)
+        
           #push notify to anyone viewing same map in realtime (see mapping.rb to understand the 'message' action)
           m.message 'destroy',@current.id
         
@@ -204,6 +210,10 @@ class TopicsController < ApplicationController
       end
     
       @mappings.each do |mapping| 
+      
+        @map = mapping.map
+        @map.touch(:updated_at)
+        
         #push notify to anyone viewing a map with this topic in realtime (see mapping.rb to understand the 'message' action)
         mapping.message 'destroy',@current.id
       

app/models/map.rb

@@ -33,18 +33,6 @@ end
     return contributors
   end
   
-  #return the date of the last edit (mapping updated) to the map
-  def last_edited
-    date = self.created_at
-    self.mappings.each do |m|
-      if m.updated_at > date
-        date = m.updated_at
-      end
-    end
-    
-    return date
-  end
-  
   
   ###### JSON ######
   #build a json object of a map

app/views/maps/_homemap.html.erb

@@ -22,7 +22,7 @@
             <%= best_in_place map, :desc, :type => :textarea, :nil => "<span class='gray'>Click to add description.</span>", :classes => 'best_in_place_desc' %>                          
           </div>                                                                
         </div>
-        <span><%= pluralize(map.contributors.count, 'contributor') %></span><span>Last edit <%= time_ago_in_words( map.last_edited ) %> ago</span>
+        <span><%= pluralize(map.contributors.count, 'contributor') %></span><span>Last edit <%= time_ago_in_words( map.updated_at ) %> ago</span>
       </div>      
     </div>
   

app/views/maps/_mapinfobox.html.erb

@@ -37,7 +37,7 @@
   
   <div class="mapInfoMeta">
     <p>Created by <%= @map.user.name %> on <%= @map.created_at.strftime("%m/%d/%Y") %></p>
-    <p>Last edited <%= @map.last_edited.strftime("%m/%d/%Y") %></p>
+    <p>Last edited <%= @map.updated_at.strftime("%m/%d/%Y") %></p>
   </div>
   
   <div class="mapInfoDelete">