如何检查请求是否在Total.js控制器中具有发布数据

Question

I want a solution to keep view and post actions on the same function, by verifying if the user submited some data.

My total.js controller is like this

# framework
exports.install = (framework) ->
  framework.route "/subscribe", subscribe
  framework.route "/subscribe", subscribe, ['post']

# subscribe form and action
subscribe = ->
  self = this
  post = self.post

  if post
    Subscriber = self.model('subscriber')
    Subscriber.save post

  self.view "form"

The problem is that post is {} when I'm just viewing the page (not submiting data), so it always enter on if .

If I compare to {} ( if post isnt {} ) the condition is always false, probably because self.post is not an empty object.

[update]

• When viewing the page:

   console.log post #logs {} 

• When submiting the form:

   console.log post #logs { type: 1, email: "email@example.com" } 

Answer 1

You don't clearly understand is / isnt . Look at that example:

coffee> {} is {}
false

Surprising ? Not if you know the is test is two variable references the same object. Not identical . Really the same object:

coffee> obj1 = {}
{}
coffee> obj2 = obj1
{}
coffee> obj1 is obj2
true

---

You might then go to == in order to test for equivalence . But:

coffee> {} == {}
false

Unfortunately, JavaScript does not provide a easy way to test for object equality .

In you case, you should resort on some trick. Like:

if (i for i in post).length == 0
  ...

Or maybe check for the presence of some key field:

if 'type' not of post
  ...

Answer 2

Simple checking:

function some_action_in_controller() {
    var self = this;
    // self.body is same as self.post
    var isEmpty = Object.keys(self.body).length === 0);
    self.json({ result: isEmpty }); 
}