Add translations to debate pg_search_scope

Some Debate attributes are now translatable so we need to include all
existing translations on pg_search scope.

app/models/debate.rb

@@ -65,13 +65,17 @@ class Debate < ApplicationRecord
       .where("author_id != ?", user.id)
   end
 
+  def searchable_translations_definitions
+    { title       => "A",
+      description => "D" }
+  end
+
   def searchable_values
-    { title              => "A",
+    {
       author.username    => "B",
       tag_list.join(" ") => "B",
       geozone.try(:name) => "B",
-      description        => "D"
-    }
+    }.merge!(searchable_globalized_values)
   end
 
   def self.search(terms)
@@ -161,4 +165,16 @@ class Debate < ApplicationRecord
     orders << "recommendations" if Setting["feature.user.recommendations_on_debates"] && user&.recommended_debates
     return orders
   end
+
+  private
+
+    def searchable_globalized_values
+      values = {}
+      translations.each do |translation|
+        Globalize.with_locale(translation.locale) do
+          values.merge! searchable_translations_definitions
+        end
+      end
+      values
+    end
 end

spec/models/debate_spec.rb

@@ -465,18 +465,35 @@ describe Debate do
 
     context "attributes" do
 
+      let(:attributes) { { title: "save the world",
+                           description: "in order to save the world one must think about...",
+                           title_es: "para salvar el mundo uno debe pensar en...",
+                           description_es: "uno debe pensar" } }
+
       it "searches by title" do
-        debate = create(:debate, title: "save the world")
+        debate = create(:debate, attributes)
         results = described_class.search("save the world")
         expect(results).to eq([debate])
       end
 
+      it "searches by title across all languages translations" do
+        debate = create(:debate, attributes)
+        results = described_class.search("salvar el mundo")
+        expect(results).to eq([debate])
+      end
+
       it "searches by description" do
-        debate = create(:debate, description: "in order to save the world one must think about...")
+        debate = create(:debate, attributes)
         results = described_class.search("one must think")
         expect(results).to eq([debate])
       end
 
+      it "searches by description across all languages translations" do
+        debate = create(:debate, attributes)
+        results = described_class.search("uno debe pensar")
+        expect(results).to eq([debate])
+      end
+
       it "searches by author name" do
         author = create(:user, username: "Danny Trejo")
         debate = create(:debate, author: author)