I want to understand how url helper works. For example, in my template I have:
<a href="{{url "Pages.IndexPages" ???}}">my super url</a>
and in controller:
func (c Pages) IndexPages() revel.Result {
...
}
I need url like
http://localhost:9000/pages?page=1
I don't want to write:
func (c Pages) IndexPages(page int) revel.Result {
because I want to check if the controller contains the param page.
How to add my template var to c.Params.Query with the url helper?
Revel url helper code in template.go
// Return a url capable of invoking a given controller method:
// "Application.ShowApp 123" => "/app/123"
func ReverseUrl(args ...interface{}) (template.URL, error) {
We need to update the manual with information about this template function, but you can see in the link and code above how it's intended to be used. You pass it a controller and action with parameters and it creates a template.URL object with the matching route.
It seems you're not interested in how the url helper works (though that's what you asked). You want to know how to pass the page variable to the template? In your controller you need to pass page via c.RenderArgs["page"] = page. Then you can reference it in your template: <a href="{{url "Pages.IndexPages" .page}}">my super url</a> Revel Template Doc.
As you noted, you can manually get the value for page with page := c.Params.Query.Get("page") if you don't want to use the parameter binding feature.