Falcor - HTTPDataSource to post Json - falcor

Question

Is it possible to post a Json file using the falcor.browser's model? I have used the get method in it. Below is what I require, but it is not working.
<script src="./js/falcor.browser.js"></script>
function registerUser() {
var dataSource = new falcor.HttpDataSource("http://localhost/registerUser.json");
var model = new falcor.Model({
source: dataSource
});
var userJson = {"name":"John","age":"35","email":"john#abc.com"};
model.
set(userJson).
then(function(done){
console.log(done);
});
This is the server.js code:
app.use('/registerUser.json', falcorExpress.dataSourceRoute(function (req, res) {
return new Router([
{
route: "rating",
get: function() {
// Post call to external Api goes here
}
}
]);
}));

Answer 1

A few things:
The Model's set() method takes 1+ pathValues, so reformat your userJson object literal into a set of pathValues. Something like:
model.
set(
{ path: ['users', 'id1', 'name'], value: 'John' },
{ path: ['users', 'id1', 'age'], value: 35 },
{ path: ['users', 'id1', 'email'], value: 'john#abc.com' }
).
then(function(done){
console.log(done);
});
Second, your router must implement set handlers to correspond to the paths you are trying to set. These handlers should also return pathValues:
new Router([
{
route: 'users[{keys:ids}]["name", "age", "email"]',
set: function(jsonGraph) {
// jsonGraph looks like { users: { id1: { name: "John", age: 35, email: "john#abc.com" }
// make request to update name/age/email fields and return updated pathValues, e.g.
return [
{ path: ['users', 'id1', 'name'], value: 'John' },
{ path: ['users', 'id1', 'age'], value: 35 },
{ path: ['users', 'id1', 'email'], value: 'john#abc.com' },
];
}
}
]);
Given that your DB request is likely asynchronous, your route get handler will have to return a promise or observable. But the above should work as a demonstration.
Edit
You can also use route pattern matching on the third path key if the number of fields gets large, as was demonstrated above on the second id key.
{
route: 'users[{keys:ids}][{keys:fields}]',
set: function(jsonGraph) {
/* jsonGraph looks like
{
users: {
id1: { field1: "xxx", field2: "yyy", ... },
id1: { field1: "xxx", field2: "yyy", ... },
...
}
}
*/
}
}