Fix subcategories links from search

app/models/category.rb

@@ -353,6 +353,12 @@ SQL
   def uncategorized?
     id == SiteSetting.uncategorized_category_id
   end
+
+  def url
+    url = "/category"
+    url << "/#{parent_category.slug}" if parent_category_id
+    url << "/#{slug}"
+  end
 end
 
 # == Schema Information

lib/search/search_result.rb

@@ -24,7 +24,7 @@ class Search
     end
 
     def self.from_category(c)
-      SearchResult.new(type: :category, id: c.id, title: c.name, url: "/category/#{c.slug}").tap do |r|
+      SearchResult.new(type: :category, id: c.id, title: c.name, url: c.url).tap do |r|
         r.color = c.color
         r.text_color = c.text_color
       end

spec/models/category_spec.rb

@@ -348,6 +348,21 @@ describe Category do
     end
   end
 
+  describe "#url" do
+    it "builds a url for normal categories" do
+      category = Fabricate(:category, name: "cats")
+      expect(category.url).to eq "/category/cats"
+    end
+
+    describe "for subcategories" do
+      it "includes the parent category" do
+        parent_category = Fabricate(:category, name: "parent")
+        subcategory = Fabricate(:category, name: "child",
+                                parent_category_id: parent_category.id)
+        expect(subcategory.url).to eq "/category/parent/child"
+      end
+    end
+  end
 
   describe "parent categories" do
     let(:user) { Fabricate(:user) }