first trial of linked data map response

app/controllers/maps_controller.rb

@@ -1,4 +1,5 @@
 class MapsController < ApplicationController
+    include MapsHelper
 
     before_filter :require_user, only: [:create, :update, :screenshot, :destroy]
 
@@ -123,6 +124,21 @@ class MapsController < ApplicationController
         end
     end
 
+    # GET maps/:id/ld
+    def ld
+
+        @current = current_user
+        @map = Map.find(params[:id]).authorize_to_show(@current)
+
+        if not @map
+            redirect_to root_url, notice: "Access denied. That map is private." and return
+        end
+
+        respond_to do |format|
+            format.json { render json: linkeddata(@map) }
+        end
+    end
+
     # POST maps
     def create
 

app/helpers/maps_helper.rb

@@ -33,4 +33,39 @@ module MapsHelper
     return temp
   end
 
+  def linkeddata(map)
+  
+    @alltopics = map.topics.delete_if {|t| t.permission == "private" && (!authenticated? || (authenticated? && @current.id != t.user_id)) }
+
+    js = Hash.new()
+    
+    js['@context'] = { "@vocab" => "http://schema.org/", "mm" => "http://ns.metamaps.cc/", "mmc" => "http://metamaps.cc/metacodes/" }
+    js['@id'] = "http://metamaps.cc/maps/" + map.id.to_s
+    js['@type'] = [ "CreativeWork", "mm:Metamap" ]  
+    js['name'] = map.name
+    js['description'] = map.desc
+    
+    graph = []
+    
+    @alltopics.each do |t|
+      topic = Hash.new()
+      topic['@id'] = 'http://metamaps.cc/topics/' + t.id.to_s
+      topic['@type'] = [
+        'mmc:' + t.metacode_id.to_s
+      ]
+      topic['name'] = t.name
+      
+      t.synapses2.each do |s|
+        topic['http://metamaps.cc/synapses/' + s.id.to_s] = [ 'http://metamaps.cc/topics/' + s.node1_id.to_s ]
+      end
+      
+      graph.push(topic)
+    end
+    
+    js['@graph'] = graph
+    
+    return js
+  end
 end
+
+

config/routes.rb

@@ -26,6 +26,10 @@ Metamaps::Application.routes.draw do
   match 'explore/mapper/:id', to: 'maps#index', via: :get, as: :usermaps
   resources :maps, except: [:new, :edit]
   match 'maps/:id/contains', to: 'maps#contains', via: :get, as: :contains
+
+  # for linked data structure
+  match 'maps/:id/ld', to: 'maps#ld', via: :get, as: :ld
+
   match 'maps/:id/upload_screenshot', to: 'maps#screenshot', via: :post, as: :screenshot
   
   devise_for :users, controllers: { registrations: 'users/registrations', passwords: 'users/passwords', sessions: 'devise/sessions' }, :skip => [:sessions]