Sencha Model.save sends /0.json to server - ruby-on-rails

Question

I've got the following code, which supposed to create a new item. Proxy type is REST.
var inst = Ext.ModelMgr.create({
title: values.title
}, "EntriesModel");
inst.save({
success: function(model) {
console.log(model);
}
});
After save(), I see that request is sent to http://localhost:3000/entries/0.json, while I assume it should have been sent to http://localhost:3000/entries
Entries model looks like this
Ext.regModel("EntriesModel", {
fields: [
{name: "id", type: "int"},
{name: "title", type: "string"},
{name: "list_id", type:"int"},
{name: "bought", type: "boolean"},
],
proxy: {
type: 'rest',
url: '/entries',
format: 'json',
noCache: true,
reader: {
type: 'json',
root: 'data'
},
writer: {
type: 'json'
},
listeners: {
exception: function (proxy, response, operation) {
console.log(proxy, response, operation);
}
}
}
});
Backend is Rails.

Answer 1

Look at this, how building a link for a Rest Proxy:
buildUrl: function(request) {
var records = request.operation.records || [],
record = records[0],
format = this.format,
url = request.url || this.url;
if (this.appendId && record) {
if (!url.match(/\/$/)) {
url += '/';
}
url += record.getId();
}
if (format) {
if (!url.match(/\.$/)) {
url += '.';
}
url += format;
}
request.url = url;
return Ext.data.RestProxy.superclass.buildUrl.apply(this, arguments);
}
Override this to provide further customizations, but remember to call the superclass buildUrl

Answer 2

Try to read this http://dev.sencha.com/deploy/touch/docs/?class=Ext.data.RestProxy
and example:
new Ext.data.RestProxy({
url: '/users',
format: 'json'
});
// Collection url: /users.json
// Instance url : /users/123.json