API for nearby node fetching

app/api/srch/search.rb

@@ -115,6 +115,29 @@ class Search < Grape::API
         sresult
       end
 
+      # Request URL should be /api/srch/locations?srchString=QRY[&seq=KEYCOUNT&showCount=NUM_ROWS&pageNum=PAGE_NUM]
+      # Note: Query(QRY as above) must have latitude and longitude as srchString=lat,lon
+      desc 'Perform a search of documents having nearby latitude and longitude tag values',
+           hidden: false,
+           is_array: false,
+           nickname: 'srchGetLocations'
+      params do
+        requires :srchString, type: String, documentation: { example: 'Spec' }
+        optional :seq, type: Integer, documentation: { example: 995 }
+        optional :showCount, type: Integer, documentation: { example: 3 }
+        optional :pageNum, type: Integer, documentation: { example: 0 }
+      end
+      get :locations do
+        sresult = DocList.new
+        unless params[:srchString].nil? || params[:srchString] == 0 || !(params[:srchString].include? ",")
+          sservice = SearchService.new
+          sresult = sservice.nearbyNodes(params[:srchString])
+        end
+        sparms = SearchRequest.fromRequest(params)
+        sresult.srchParams = sparms
+        sresult
+      end
+
       # end endpoint definitions
     end
   end

app/services/search_service.rb

@@ -183,4 +183,30 @@ def textSearch_questions(srchString)
     end
     sresult
   end
+
+  def nearbyNodes(srchString)
+    sresult = DocList.new
+    coordinates = srchString.split(",")
+    lat = coordinates[0]
+    lon = coordinates[1]
+
+    nids = NodeTag.joins(:tag)
+               .where('name LIKE ?', 'lat:' + lat[0..lat.length - 2] + '%')
+               .collect(&:nid)
+
+    nids = nids || []
+
+    items = Node.includes(:tag)
+                .references(:node, :term_data)
+                .where('node.nid IN (?) AND term_data.name LIKE ?', nids, 'lon:' + lon[0..lon.length - 2] + '%')
+                .limit(200)
+                .order('node.nid DESC')
+
+    items.each do |match|
+      doc = DocResult.fromSearch(match.nid, 'coordinates', match.path(:items), match.title, 0, match.answers.length.to_i)
+      sresult.addDoc(doc)
+    end
+    sresult
+  end
+
 end

doc/API.md

@@ -10,6 +10,7 @@ Per-model API endpoints are:
 * Questions: https://publiclab.org/api/srch/questions?srchString=foo
 * Tags: https://publiclab.org/api/srch/tags?srchString=foo
 * Notes: https://publiclab.org/api/srch/notes?srchString=foo
+* Locations: https://publiclab.org/api/srch/locations?srchString=lat,lon
 
 We also provide RSS feeds for tags and authors, in the format: