fix: allow use of an attribute named relationships

framework/core/js/src/common/Application.tsx

@@ -671,7 +671,7 @@ export default class Application {
    * @protected
    */
   protected requestWasCrossOrigin(error: RequestError): boolean {
-    return new URL(error.options.url, document.baseURI).origin !== window.location.origin;
+    return new URL(error.options?.url, document.baseURI).origin !== window.location.origin;
   }
 
   protected requestErrorDefaultHandler(e: unknown, isDebug: boolean, formattedErrors: string[]): void {

framework/core/js/src/common/Model.ts

@@ -192,7 +192,8 @@ export default abstract class Model {
     // If a 'relationships' key exists, extract it from the attributes hash and
     // set it on the top-level data object instead. We will be sending this data
     // object to the API for persistence.
-    if (attributes.relationships) {
+    // But only if the model does not actually have a real relationships attribute.
+    if (attributes.relationships && !('relationships' in this)) {
       data.relationships = {};
 
       for (const key in attributes.relationships) {
@@ -208,6 +209,8 @@ export default abstract class Model {
       delete attributes.relationships;
     }
 
+    console.log('data', data);
+
     // Before we update the model's data, we should make a copy of the model's
     // old data so that we can revert back to it if something goes awry during
     // persistence.