post.js

Post.Views.Post = Backbone.View.extend({
  el: '#post',

  initialize: function () {
    this.template = _.template($('#post-template').html());

    app.on('change:post', this.render, this);
  },

  render: function (post) {
    this.$el.html(this.template(post.toJSON()));
    return this;
  },
});

post_title.js

Post.Views.PostTitle = Backbone.View.extend({
  tagName: 'li',

  initialize: function () {
    this.template = _.template($('#post-title-template').html());
  },

  events: {
    'click': 'changePost',
  },

  changePost: function () {
    app.trigger('change:post', this.model);
  },

  render: function () {
    this.$el.html(this.template(this.model.toJSON()));
    return this;
  },
});