express 多個 view folder

express.js

'use strict';

var path = require('path');
var express = require('express');

function _merge(a, b) {
  if (a && b) {
    var i;
    for (i in b) {
      if (b.hasOwnProperty(i)) {
        a[i] = b[i];
      }
    }
  }
  return a;
}

express.application.render = function (name, options, fn) {
  var opts = {};
  var cache = this.cache;
  var engines = this.engines;
  var view, key;

  // support callback function as second arg
  if ('function' === typeof options) {
    fn = options;
    options = {};
  }

  // merge app.locals
  _merge(opts, this.locals);

  // merge options._locals
  if (options._locals) {
    utils.merge(opts, options._locals);
  }

  // merge options
  _merge(opts, options);

  // set .cache unless explicitly provided
  opts.cache = null === opts.cache
    ? this.enabled('view cache')
    : opts.cache;

  // primed cache
  if (opts.cache) {
    view = cache[name];
  }

  // view
  if (!view) {
    var views = this.get('views');
    var tmp = name.split('<-');
    var root = views.hasOwnProperty(tmp[0]) ? views[tmp[0]] : views.default;
    view = new (this.get('view'))(name, {
      defaultEngine: this.get('view engine'),
      root: root,
      engines: engines
    });

    if (!view.path) {
      var err = new Error('Failed to lookup view "' + name + '"');
      err.view = view;
      return fn(err);
    }

    // prime the cache
    if (opts.cache) {
      cache[name] = view;
    }
  }

  // render
  try {
    view.render(opts, fn);
  } catch (err2) {
    fn(err2);
  }
};

module.exports = express;

.render('admin<-index') // 使用 key 是 admin 的位置
.render('index') // 使用 key 是 default 的位置

要改有點麻煩，所以直接把 express 程式碼複製出來在修改，這樣比較快...