Using App.api.buildURL with filters to return results from another module

Just a guess while I am doing homework for my kids (at least that's what it feels like) but maybe the 'United Kingdom' needs to be URLencoded so maybe

url = app.api.buildURL('Countries', null, {'name': 'United%20Kingdom'});

Also not sure about your call, maybe it would be better as something like

App.api.call("read", url, null, {
    success:function (a) {
        console.log(a);
    }
});

Again thats all just off the top my head but i always use 'read' and I never have used "_.bind(function (response) {" that way.  It might all be right, just saying I dont do it that way.

I would suggest that you look at the list view of the module you want to retrieve data from and see if you can generate the url using the filters in that list view. If you know the url you know what you should build. When the app.api.call is executed what do you see in development tools? Do you see the actual call made and what does it return? Is the url exactly the same as the call in postman?

sorry that was an older code i did change to read after going through a sugar article but thanks for the comment

thats an interesting tip for the future, thanks for that

it was working after i removed and reinstalled the package but thanks for everyones suggestions and help

({
    extendsFrom: 'RecordView',
    
    initialize: function (options) {
        this._super('initialize', [options]);
        this.model.on('change:billing_address_country', this._setMarketingRegion, this);
    },
    
    _setMarketingRegion: function(model) {
        var country     = this.model.get('billing_address_country'),
            url         = app.api.buildURL('Cunty_Countries', null, null, {
                'filter'    : [{
                    'name'  : country
                }]
            });

        if (country) {
            app.api.call('GET', url, null, {
                success     : _.bind(function (response) {
                    this.model.set("marketing_region_c", response.records[0].marketing_region_c);
                }, this),
                error       : _.bind(function (error) {
                    console.log("Error", error)
                }, this),
            });
        }
    },    
})

thanks for that, I added a line to url encode the country as we do have some with brackets that were also breaking the system