cast hstore values on write to be consistent with reading from the db.

activerecord/CHANGELOG.md

@@ -1,3 +1,18 @@
+*   Type cast hstore values on write, so that the value is consistent
+    with reading from the database.
+
+    Example:
+
+        x = Hstore.new tags: {"bool" => true, "number" => 5}
+
+        # Before:
+        x.tags # => {"bool" => true, "number" => 5}
+
+        # After:
+        x.tags # => {"bool" => "true", "number" => "5"}
+
+    *Yves Senn* , *Severin Schoepke*
+
 *   Fix multidimensional PG arrays containing non-string items.
 
     *Yves Senn*

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

@@ -6,10 +6,6 @@ class PostgreSQLAdapter < AbstractAdapter
       module OID
         class Type
           def type; end
-
-          def type_cast_for_write(value)
-            value
-          end
         end
 
         class Identity < Type
@@ -224,6 +220,10 @@ def type_cast(value)
         end
 
         class Hstore < Type
+          def type_cast_for_write(value)
+            ConnectionAdapters::PostgreSQLColumn.hstore_to_string value
+          end
+
           def type_cast(value)
             return if value.nil?
 

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -129,6 +129,14 @@ def self.extract_value_from_default(default)
         end
       end
 
+      def type_cast_for_write(value)
+        if @oid_type.respond_to?(:type_cast_for_write)
+          @oid_type.type_cast_for_write(value)
+        else
+          super
+        end
+      end
+
       def type_cast(value)
         return if value.nil?
         return super if encoded?

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

@@ -70,6 +70,13 @@ def test_change_table_supports_hstore
     Hstore.reset_column_information
   end
 
+  def test_cast_value_on_write
+    x = Hstore.new tags: {"bool" => true, "number" => 5}
+    assert_equal({"bool" => "true", "number" => "5"}, x.tags)
+    x.save
+    assert_equal({"bool" => "true", "number" => "5"}, x.reload.tags)
+  end
+
   def test_type_cast_hstore
     assert @column