gistfile1.js

EmailTemplater.templatesController = SC.ObjectController.create({
  content: SC.Object.create({
    subject: '',
    body: ''
  }),

  convertedSubject: function() {
    return this._replacePlacholders("subject");
  }.property('subject'),

  convertedBody: function() {
    return this._replacePlacholders("body");
  }.property('body'),

  _replacePlaceholders: function(field) {
    return EmailTemplater.parsingController.get(field).replace(regex, function(match, group) {
      var placeholders = EmailTemplater.store.find(SC.Query.local(EmailTemplater.Placeholder, "name = %@", [group])).objectAt(0);

      return placeholders.get('text');
    });
  }
});