Odoo UI widget - how to get settings from database? - odoo

Question

I'm writing an Odoo v9 widget, which renders a URL, based on concatenation of a setting in the database, and the actual form fields.
The setting in the database I figure should live in ir_config_parameter. I'm inserting a default value with my module.
What's the best way to get this value when rendering the widget? Doing an async ajax call using
new Model("ir.config_parameter")
seems a little heavy handed. Is there a better way to be doing this?
Thanks.
Widget code:
var UrlWidget2 = form_common.FormWidget.extend({
start: function() {
this._super();
this.field_manager.on("field_changed:ref", this, this.display_result);
this.display_result();
},
display_result: function() {
var ref = this.field_manager.get_field_value("ref");
if (!ref) return;
var baseUrl = 'https://example.com'; //this is the value I want to get from the setting in the database.
var url = baseUrl + '/foo/' + ref;
this.$el.html('View Externally<br /><br/>');
}
});

Answer 1

You can use RPC for this. This is example which work for me:
var Model = require('web.DataModel');
var UrlWidget2 = form_common.FormWidget.extend({
// just example how to get parameter from backend
display_result: function() {
var parameter = new Model('ir.config_parameter');
// get fields value, key
parameter.query(['value', 'key'])
// criteria of search - record with id = 1
.filter([['id', '=', 1]])
// only one record
.limit(1)
.all()
.then(function (parameter) {
// here data from server
console.log(parameter);
});
// ...
}
});
Hope this helps you.