GX4008: signal-bound fields need rules or gx.Unchecked

Cause

An action input reads a signal and has no rules. The browser controls each signal value, so the server must check it.

cart/Button.gx

package cart

import "app/cart/route"

signals {
  Qty int = 1
}

<button on:click={route.Add{}}>Add</button>

cart/cart.go

package cart

import (
	"github.com/alternayte/gx"
	"app/cart/route"
)

var Add = gx.Action(func(c *gx.Ctx, in route.Add) error { return nil })

cart/route/route.go

package route

import "github.com/alternayte/gx"

type Add struct {
	gx.Route `POST /cart/add`
	Qty      int `signal:"qty"`
}

gx check reports:

gx check

cart/route/route.go:5:6: GX4008: action "Add" has signal-bound fields; add Rules() or embed gx.Unchecked