Vulcan/client/views/posts/post_item.js

var filteredModules = function (positions) {
  return _.filter(postModules, function(module){return _.contains(positions, module.position)});
}

var post = {};

Template[getTemplate('post_item')].created = function () {
  post = this.data;
};

Template[getTemplate('post_item')].helpers({
  leftPostModules: function () {
    return filteredModules(['leftOfLeft', 'left', 'rightOfLeft']);
  },
  centerPostModules: function () {
    return filteredModules(['leftOfCenter', 'center', 'rightOfCenter']);
  },
  rightPostModules: function () {
    return filteredModules(['leftOfRight', 'right', 'rightOfRight']);
  },
  moduleContext: function () {
    var moduleContext = _.extend(this, post);
    moduleContext.templateClass = camelToDash(moduleContext.template);
    moduleContext._id = null;
    return moduleContext;
  }
});