feat(decorators): add error handling for common model usage

addon/decorators/handle-model-errors.js

@@ -0,0 +1,43 @@
+import { assert } from "@ember/debug";
+
+export default function (...args) {
+  const [{ routeFor404, errorMessage = "emeis.not-found" } = {}] = args;
+
+  const decorate = function (target, name, descriptor) {
+    const originalDescriptor = descriptor.value;
+
+    descriptor.value = function (...args) {
+      assert(
+        "Inject the `notification` as well as the `intl` service into your route to properly display errors.",
+        this.notification && this.intl
+      );
+
+      const catchErrors = (exception) => {
+        if (
+          routeFor404 &&
+          exception.isAdapterError &&
+          exception.errors[0].status === "404"
+        ) {
+          this.notification.danger(this.intl.t(errorMessage));
+          this.replaceWith(routeFor404);
+        } else {
+          this.notification.danger(this.intl.t("emeis.general-error"));
+        }
+      };
+
+      try {
+        const result = originalDescriptor.apply(this, args);
+        return result.then ? result.catch(catchErrors) : result;
+      } catch (exception) {
+        catchErrors(exception);
+      }
+    };
+  };
+
+  // We can assume that the decorator was called without options
+  if (args.length === 3 && !args[0].routeFor404 && !args[0].errorMessage) {
+    return decorate(...args);
+  }
+
+  return decorate;
+}

app/decorators/handle-model-errors.js

@@ -0,0 +1 @@
+export { default } from "ember-emeis/decorators/handle-model-errors";