Add option to disable ranking of results entirely when using pg_search_scope.

lib/pg_search/configuration.rb

@@ -88,7 +88,7 @@ def default_options
     ].map(&:to_sym)
 
     VALID_VALUES = {
-      :ignoring => [:accents]
+      :ignoring => [:accents, :rank]
     }
 
     def assert_valid_options(options)

lib/pg_search/scope_options.rb

@@ -13,12 +13,13 @@ def initialize(config)
     end
 
     def apply(scope)
-      scope = include_table_aliasing_for_rank(scope)
-      rank_table_alias = scope.pg_search_rank_table_alias(:include_counter)
+      if @config.ignore.include? :rank
+        scope = scope.where(conditions)
+      else
+        scope = apply_ranked(scope)
+      end
 
       scope
-        .joins(rank_join(rank_table_alias))
-        .order("#{rank_table_alias}.rank DESC, #{order_within_rank}")
         .extend(DisableEagerLoading)
         .extend(WithPgSearchRank)
     end
@@ -67,6 +68,15 @@ def pg_search_scope_application_count_plus_plus
 
     delegate :connection, :quoted_table_name, :to => :model
 
+    def apply_ranked(scope)
+      scope = include_table_aliasing_for_rank(scope)
+      rank_table_alias = scope.pg_search_rank_table_alias(:include_counter)
+
+      scope
+        .joins(rank_join(rank_table_alias))
+        .order("#{rank_table_alias}.rank DESC, #{order_within_rank}")
+    end
+
     def subquery
       model
         .unscoped

spec/integration/pg_search_spec.rb

@@ -1097,6 +1097,19 @@
       end
     end
 
+    context "ignoring rank" do
+      before do
+        ModelWithPgSearch.pg_search_scope :search_title_without_rank,
+          :against => :title,
+          :ignoring => :rank
+      end
+
+      it "does not use ts_rank in the query" do
+        sql = ModelWithPgSearch.search_title_without_rank("foobar").to_sql
+        expect(sql).to_not include "ts_rank"
+      end
+    end
+
     context "when passed a :ranked_by expression" do
       before do
         ModelWithPgSearch.pg_search_scope :search_content_with_default_rank,