From 2dd0178229ccd5e7f19f120ded85fd4a80306cac Mon Sep 17 00:00:00 2001
From: Joel <joel@renewfund.com>
Date: Wed, 8 Feb 2012 14:21:10 -0800
Subject: Also support writing the hstore back to the database

---
 .../lib/active_record/connection_adapters/postgresql_adapter.rb   | 5 +++++
 activerecord/test/cases/adapters/postgresql/hstore_test.rb        | 8 ++++++++
 2 files changed, 13 insertions(+)

diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
index 692848d3e5..a5af8a6845 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
@@ -476,6 +476,11 @@ module ActiveRecord
         return super unless column
 
         case value
+        when Hash
+          case column.sql_type
+          when 'hstore' then super(PostgreSQLColumn.hstore_to_string(value), column)
+          else super
+          end
         when Float
           return super unless value.infinite? && column.type == :datetime
           "'#{value.to_s.downcase}'"
diff --git a/activerecord/test/cases/adapters/postgresql/hstore_test.rb b/activerecord/test/cases/adapters/postgresql/hstore_test.rb
index 82c52b38a3..1644a58d92 100644
--- a/activerecord/test/cases/adapters/postgresql/hstore_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/hstore_test.rb
@@ -86,6 +86,14 @@ class PostgresqlHstoreTest < ActiveRecord::TestCase
     assert_equal({"\"a"=>"q\"w"}, @column.type_cast('\"a=>q"w'))
   end
 
+  def test_rewrite
+    @connection.execute "insert into hstores (tags) VALUES ('1=>2')"
+    x = Hstore.find :first
+    x.tags = { '"a\'' => 'b' }
+    assert x.save!
+  end
+
+
   def test_select
     @connection.execute "insert into hstores (tags) VALUES ('1=>2')"
     x = Hstore.find :first
-- 
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