Make sure range strings are quoted after we quote the range.

activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb

@@ -24,7 +24,7 @@ def quote(value, column = nil) #:nodoc:
           when Range
             if /range$/ =~ sql_type
               escaped = quote_string(PostgreSQLColumn.range_to_string(value))
-              "#{escaped}::#{sql_type}"
+              "'#{escaped}'::#{sql_type}"
             else
               super
             end

activerecord/test/cases/adapters/postgresql/quoting_test.rb

@@ -61,7 +61,7 @@ def test_quote_time_usec
         def test_quote_range
           range = "1,2]'; SELECT * FROM users; --".."a"
           c = PostgreSQLColumn.new(nil, nil, OID::Range.new(:integer), 'int8range')
-          assert_equal "[1,2]''; SELECT * FROM users; --,a]::int8range", @conn.quote(range, c)
+          assert_equal "'[1,2]''; SELECT * FROM users; --,a]'::int8range", @conn.quote(range, c)
         end
       end
     end

activerecord/test/cases/adapters/postgresql/range_test.rb

@@ -216,6 +216,24 @@ def test_exclude_beginning_for_date_ranges
       assert_equal Date.new(2012, 1, 3)..Date.new(2012, 1, 4), range.date_range
     end
 
+    def test_update_all_with_ranges
+      PostgresqlRange.create!
+
+      PostgresqlRange.update_all(int8_range: 1..100)
+
+      assert_equal 1...101, PostgresqlRange.first.int8_range
+    end
+
+    def test_ranges_correctly_escape_input
+      e = assert_raises(ActiveRecord::StatementInvalid) do
+        range = "1,2]'; SELECT * FROM users; --".."a"
+        PostgresqlRange.update_all(int8_range: range)
+      end
+
+      assert e.message.starts_with?("PG::InvalidTextRepresentation")
+      ActiveRecord::Base.connection.rollback_transaction
+    end
+
     private
       def assert_equal_round_trip(range, attribute, value)
         round_trip(range, attribute, value)