为什么我无法从我的requirejs配置访问我的REST网址

Question

I am trying to set up a REST url in my requirejs config. Here is my config:

  require.config({
    config: {
      url: 'http://test.herokuapp.com'
    }
  });

I then try to access the url in my module:

define(function(require, exports, module) {
  'use strict';

  var Backbone = require('backbone');
  var url = module.config().url;

  var SessionModel = Backbone.Model.extend({
    url: url + '/login'
  });
  return SessionModel;
});

I then fire up my app, and when I try to hit the url I get this error:

POST http://99.44.242.76:3000/app/undefined/login 404 (Not Found) 

My url is undefined. How do I access this piece of my config file in a module?

Answer 1

The config setting works on a per-module basis. The config setting is an object which has for keys module names, and module.config() returns only the value associated with the name of the module that calls it. So you'd have to put your module name in your configuration:

require.config({
  config: {
    my_module: {
      url: 'http://test.herokuapp.com'
    }
  }
});

Where my_module should be the actual name of your module. Then the url setting will be available as module.config().url (which is what you are already using).

If you want the url setting to be available to all modules, one thing you can do is to create a module that merely exports its config. For instance, if I call this module global :

require.config({
  config: {
    global: {
      url: 'http://test.herokuapp.com'
    }
  }
});

Then global.js could contain something like:

define(function(require, exports, module) {
  'use strict';

  return module.config();
});

And then the module you had in your question could be something like this:

define(function(require, exports, module) {
  'use strict';

  var global = require("global");
  var Backbone = require('backbone');

  var url = global.url;

  var SessionModel = Backbone.Model.extend({
    url: url + '/login'
  });
  return SessionModel;
});