SD-1446 use pg_search for full text search of porduct names when pg_s…

…earch is available. (#11416)

* SD-1446 use pg_search for full text search of porduct names when pg_search is available

* SD-1446 small adjustment

* SD-1446 CR adjustments

core/app/models/concerns/spree/product_scopes.rb

@@ -277,6 +277,26 @@ def self.for_user(user = nil)
         group('spree_products.id').joins(:taxons).where(Taxon.arel_table[:name].eq(name))
       end
 
+      # .search_by_name
+      if defined?(PgSearch)
+        include PgSearch::Model
+
+        if defined?(SpreeGlobalize)
+          pg_search_scope :search_by_name, associated_against: { translations: :name }, using: :tsearch
+        else
+          pg_search_scope :search_by_name, against: :name, using: :tsearch
+        end
+      else
+        def self.search_by_name(query)
+          if defined?(SpreeGlobalize)
+            joins(:translations).order(:name).where("LOWER(#{Product::Translation.table_name}.name) LIKE LOWER(:query)", query: "%#{query}%").distinct
+          else
+            where("LOWER(#{Product.table_name}.name) LIKE LOWER(:query)", query: "%#{query}%")
+          end
+        end
+      end
+      search_scopes << :search_by_name
+
       def self.price_table_name
         Price.quoted_table_name
       end

core/app/models/spree/product.rb

@@ -264,14 +264,6 @@ def self.like_any(fields, values)
       where conditions.inject(:or)
     end
 
-    def self.search_by_name(query)
-      if defined?(SpreeGlobalize)
-        joins(:translations).order(:name).where("LOWER(#{Product::Translation.table_name}.name) LIKE LOWER(:query)", query: "%#{query}%").distinct
-      else
-        where("LOWER(#{Product.table_name}.name) LIKE LOWER(:query)", query: "%#{query}%")
-      end
-    end
-
     # Suitable for displaying only variants that has at least one option value.
     # There may be scenarios where an option type is removed and along with it
     # all option values. At that point all variants associated with only those