created utils folder inside compensations folder and created validati…

…on file to align with PR 535

studio/schemas/objects/compensations/benefitsByLocation.ts

@@ -2,10 +2,8 @@ import { defineField } from "sanity";
 import { location, locationID } from "../locations";
 import { companyLocationNameID } from "studio/schemas/documents/companyLocation";
 import { benefitId } from "studio/schemas/documents/benefit";
-import {
-  checkForDuplicateLocations,
-  DocumentWithLocation,
-} from "studio/utils/checkForDuplicateLocations";
+import { checkForDuplicateLocations, DocumentWithLocation } from "./utils/validation";
+
 
 export const benefitsByLocation = defineField({
   name: "benefitsByLocation",

studio/schemas/objects/compensations/utils/validation.ts

@@ -0,0 +1,27 @@
+interface LocationReference {
+    _ref: string;
+    _type: string;
+    title?: string;
+  }
+
+  export interface DocumentWithLocation {
+    location: LocationReference;
+  }
+
+  /**
+   * Checks for duplicate location references in the documents array.
+   * Ensures each location has a unique document entry.
+   *
+   * @param {DocumentWithLocation[] | undefined} documents - The array of documents, each with one or more locations.
+   * @returns {string | true} - Returns an error message if duplicate locations are found, or true if all are unique.
+   */
+  export const checkForDuplicateLocations = (
+    documents: DocumentWithLocation[] | undefined,
+  ): boolean => {
+    if (!documents) return true;
+    const locationRefs = documents
+      .map((entry) => entry.location?._ref)
+      .filter(Boolean);
+    const uniqueRefs = new Set(locationRefs);
+    return uniqueRefs.size === locationRefs.length;
+  };