In my coffeescript frontend I attempt to pass a list of value to the backend
data = {
id: [2, 3, 4]
}
$.post url, data
In the handler in a Google app engine (python) backend, I read the value like so:
id_value = self.request.get('id')
LOG.info("%s", id_value)
It always print out '2' only.
How can I get the backend to obtain the list [2,3,4]?
$.post by default sends data in url-encoded format, which handles nested structures in its own way.
You might need to encode the data in JSON before sending and then decode it on the server side - an example is here.
The request object provides a get() method that returns values for arguments parsed from the query and from POST data.
If the argument appears more than once in a request, by default get() returns the first occurrence. To get all occurrences of an argument that might appear more than once as a list (possibly empty), give get() the argument allow_multiple=True.
Hence you should use something like the below snippet. You can find more details here.
id_value = self.request.get('id', allow_multiple=True)
If you need to access variables url encoded in the body of a request (generally a POST form submitted using the application/x-www-form-urlencoded media type), you should use something like this.
id_value = self.request.POST.getall('id')
