Prevent update a screen URL to an existing URL for the same role

packages/builder/src/components/design/PropertiesPanel/ScreenSettingsSection.svelte

@@ -8,14 +8,41 @@
   import { currentAsset, store } from "builderStore"
   import { FrontendTypes } from "constants"
   import sanitizeUrl from "builderStore/store/screenTemplates/utils/sanitizeUrl"
+  import { allScreens, selectedAccessRole } from "builderStore"
 
   export let componentInstance
   export let bindings
 
-  function setAssetProps(name, value, parser) {
+  let errors = {}
-    if (parser && typeof parser === "function") {
+
+  const routeExists = url => {
+    const roleId = get(selectedAccessRole) || "BASIC"
+    return get(allScreens).some(
+      screen =>
+        screen.routing.route.toLowerCase() === url.toLowerCase() &&
+        screen.routing.roleId === roleId
+    )
+  }
+
+  const setAssetProps = (name, value, parser, validate) => {
+    if (parser) {
       value = parser(value)
     }
+    if (validate) {
+      const error = validate(value)
+      errors = {
+        ...errors,
+        [name]: error,
+      }
+      if (error) {
+        return
+      }
+    } else {
+      errors = {
+        ...errors,
+        [name]: null,
+      }
+    }
 
     const selectedAsset = get(currentAsset)
     store.update(state => {
@@ -38,7 +65,6 @@
   }
 
   const screenSettings = [
-    // { key: "description", label: "Description", control: Input },
     {
       key: "routing.route",
       label: "Route",
@@ -49,6 +75,13 @@
         }
         return sanitizeUrl(val)
       },
+      validate: val => {
+        const exisingValue = deepGet($currentAsset, "routing.route")
+        if (val !== exisingValue && routeExists(val)) {
+          return "That URL is already in use"
+        }
+        return null
+      },
     },
     { key: "routing.roleId", label: "Access", control: RoleSelect },
     { key: "layoutId", label: "Layout", control: LayoutSelect },
@@ -62,9 +95,11 @@
         control={def.control}
         label={def.label}
         key={def.key}
+        error="asdasds"
         value={deepGet($currentAsset, def.key)}
-        onChange={val => setAssetProps(def.key, val, def.parser)}
+        onChange={val => setAssetProps(def.key, val, def.parser, def.validate)}
         {bindings}
+        props={{ error: errors[def.key] }}
       />
     {/each}
   </DetailSummary>