Convert single array values to values (#2506)

src/util.test.ts

@@ -111,4 +111,20 @@ describe("Tests the form convert util functions", () => {
       attributes: {},
     });
   });
+
+  it("convert single element arrays to string", () => {
+    const given = {
+      config: { group: ["one"], another: { nested: ["value"] } },
+    };
+    const setValue = jest.fn();
+
+    //when
+    convertToFormValues(given, setValue);
+
+    //then
+    expect(setValue).toHaveBeenCalledWith("config", {
+      group: "one",
+      another: { nested: "value" },
+    });
+  });
 });

src/util.ts

@@ -89,7 +89,15 @@ export const convertToFormValues = (
     if (key === "attributes" && isAttributesObject(value)) {
       setValue(key, arrayToKeyValue(value as Record<string, string[]>));
     } else if (key === "config" || key === "attributes") {
-      setValue(key, !isEmpty(value) ? unflatten(value) : undefined);
+      if (!isEmpty(value)) {
+        const flattened: any = flatten(value, { safe: true });
+        const convertedValues = Object.entries(flattened).map(([key, value]) =>
+          Array.isArray(value) ? [key, value[0]] : [key, value]
+        );
+        setValue(key, unflatten(Object.fromEntries(convertedValues)));
+      } else {
+        setValue(key, undefined);
+      }
     } else {
       setValue(key, value);
     }