can create hstore records via AR API

3 files changed, 18 insertions, 5 deletions

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 6ea8ce129a..ee2811c2be 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,5 +1,7 @@
 ## Rails 4.0.0 (unreleased) ##
 
+*   PostgreSQL hstore records can be created.
+
 *   PostgreSQL hstore types are automatically deserialized from the database.
 
 ## Rails 3.2.0 (unreleased) ##
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
index c26b61443b..6e169ae5c5 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
@@ -50,11 +50,15 @@ module ActiveRecord
           end
         end
 
-        def cast_hstore(string)
-          kvs = string.split(', ').map { |kv|
-            kv.split('=>').map { |k| k[1...-1] }
-          }
-          Hash[kvs]
+        def cast_hstore(object)
+          if Hash === object
+            object.map { |k,v| "#{k}=>#{v}" }.join ', '
+          else
+            kvs = object.split(', ').map { |kv|
+              kv.split('=>').map { |k| k[1...-1] }
+            }
+            Hash[kvs]
+          end
         end
       end
       # :startdoc:
diff --git a/activerecord/test/cases/adapters/postgresql/hstore_test.rb b/activerecord/test/cases/adapters/postgresql/hstore_test.rb
index 5031486f29..7267536142 100644
--- a/activerecord/test/cases/adapters/postgresql/hstore_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/hstore_test.rb
@@ -43,4 +43,11 @@ class PostgresqlHstoreTest < ActiveRecord::TestCase
     x = Hstore.find :first
     assert_equal({'1' => '2', '2' => '3'}, x.tags)
   end
+
+  def test_create
+    hash = { 'a' => 'b', '1' => '2' }
+    x = Hstore.create!(:tags => hash)
+    x.reload
+    assert_equal hash, x.tags
+  end
 end