switch from yaml to json serialization

db/migrate/20131223032112_switch_to_json_serialization.rb

@@ -0,0 +1,41 @@
+class SwitchToJsonSerialization < ActiveRecord::Migration
+  FIELDS = {
+    :agents => [:options, :memory],
+    :events => [:payload]
+  }
+
+  def up
+    puts "This migration will update Agent and Event storage from YAML to JSON.  It should work, but please make a backup"
+    puts "before proceeding."
+    print "Continue? (y/n) "
+    STDOUT.flush
+    exit unless STDIN.gets =~ /^y/i
+
+    translate YAML, JSON
+  end
+
+  def down
+    translate JSON, YAML
+  end
+
+  def translate(from, to)
+    FIELDS.each do |table, fields|
+      quoted_table_name = ActiveRecord::Base.connection.quote_table_name(table)
+      fields = fields.map { |f| ActiveRecord::Base.connection.quote_column_name(f) }
+
+      rows = ActiveRecord::Base.connection.select_rows("SELECT id, #{fields.join(", ")} FROM #{quoted_table_name}")
+      rows.each do |row|
+        id, *field_data = row
+
+        yaml_fields = field_data.map { |f| from.load(f) }.map { |f| to.dump(f) }
+
+        update_sql = "UPDATE #{quoted_table_name} SET #{fields.map {|f| "#{f}=?"}.join(", ")} WHERE id = ?"
+
+        sanitized_update_sql = ActiveRecord::Base.send :sanitize_sql_array, [update_sql, *yaml_fields, id]
+
+        ActiveRecord::Base.connection.execute sanitized_update_sql
+      end
+    end
+
+  end
+end

lib/serialize_and_normalize.rb

@@ -8,7 +8,7 @@ module SerializeAndNormalize
         normalize_name = "normalize_#{column_name}".to_sym
         validate_name = "validate_#{column_name}".to_sym
 
-        serialize column_name
+        serialize column_name, JSON
         after_initialize setup_name
         before_validation normalize_name
         before_save normalize_name