SCRUM#388: Save searched words (with information of whether they had results)

app/controllers/v1/search_controller.rb

@@ -27,7 +27,13 @@ class V1::SearchController < ApplicationController
   # GET v1/search.json
   def index
     search = SearchService.instance(@search, current_user).search
-    save_search()
+    if ((search.results).empty?)
+      @search.has_results = false
+      save_search()
+    else
+      @search.has_results = true
+      save_search()
+    end
 
     headers['X-Total-Count'] = search.total_count
     render json: search.results, status: :ok

db/migrate/20190313143808_add_has_results_column_to_searches.rb

+class AddHasResultsColumnToSearches < ActiveRecord::Migration[5.0]
+  def change
+    add_column :searches, :has_results, :boolean
+  end
+end