Support NULL values when searching multiple columns

lib/pg_search.rb

@@ -29,7 +29,7 @@ def pg_search_scope(name, matches)
         options = options_proc.call(*args)
 
         matches_concatenated = Array.wrap(options[:matches]).map do |match|
-          "#{quoted_table_name}.#{connection.quote_column_name(match)}"
+          "coalesce(#{quoted_table_name}.#{connection.quote_column_name(match)}, '')"
         end.join(" || ' ' || ")
 
         conditions = "to_tsvector('simple', #{matches_concatenated}) @@ plainto_tsquery('simple', :query)"

spec/pg_search_spec.rb

@@ -59,6 +59,18 @@
       end
     end
 
+    it "builds a scope for searching on multiple columns where one is NULL" do
+      model_with_pg_search.class_eval do
+        pg_search_scope :search_text_and_content, [:title, :content]
+      end
+
+      included = model_with_pg_search.create!(:title => 'foo', :content => nil)
+
+      results = model_with_pg_search.search_text_and_content('foo')
+
+      results.should == [included]
+    end
+
     it "builds a dynamic scope when passed a lambda" do
       model_with_pg_search.class_eval do
         pg_search_scope :search_title_or_content, lambda { |query, pick_content|