Fix the problem that was preventing rows from taking updates.

As a consequence, I removed the ability to configure which column to use for the schema version. It's
currently YAGNI.

lib/cassandra_object/migrations.rb

@@ -2,8 +2,6 @@ module CassandraObject
   module Migrations
     extend ActiveSupport::Concern
     included do
-      cattr_accessor :migration_column_name
-      self.migration_column_name = :schema_version
       class_inheritable_array :migrations
       class_inheritable_accessor :current_schema_version
       self.current_schema_version = 0
@@ -43,8 +41,8 @@ def migrate(version, &blk)
       end
 
       def instantiate(key, attributes)
+        version = attributes.delete('schema_version')
         original_attributes = attributes.dup
-        version = attributes[migration_column_name.to_s]
         if version == current_schema_version
           return super(key, attributes)
         end
@@ -61,7 +59,7 @@ def instantiate(key, attributes)
 
         migrations_to_run.inject(attributes) do |attrs, migration|
           migration.run(attrs)
-          attrs[migration_column_name.to_s] = migration.version.to_s
+          @schema_version = migration.version.to_s
           attrs
         end
 

test/basic_scenarios_test.rb

@@ -167,4 +167,12 @@ class JankyObject < CassandraObject::Base
       end
     end
   end
+
+  test "updating columns" do
+    appt = Appointment.new(:start_time => Time.now, :title => 'emergency meeting')
+    appt.save!
+    appt = Appointment.get(appt.key)
+    appt.start_time = Time.now + 1.hour
+    appt.save!
+  end
 end

test/fixture_models.rb

@@ -20,8 +20,6 @@ def should_be_cool
       errors.add(:first_name, "must be that of a cool person")
     end
   end
-
-
 end
 
 class Invoice < CassandraObject::Base