fix: Also apply simple type to operator map (#8278)

packages/medusa/src/api/utils/validators.ts

@@ -77,19 +77,17 @@ export const createOperatorMap = (
     type = z.string()
   }
 
-  let unionType: any = z.union([type, z.array(type)]).optional()
-  let arrayType: any = z.array(type).optional()
   let simpleType: any = type.optional()
-
   if (valueParser) {
-    unionType = z
-      .preprocess(valueParser, z.union([type, z.array(type)]))
-      .optional()
-    arrayType = z.preprocess(valueParser, z.array(type)).optional()
     simpleType = z.preprocess(valueParser, type).optional()
   }
 
-  return z.object({
+  const arrayType: any = z.array(type).optional()
+  const unionType: any = z.union([simpleType, arrayType]).optional()
+
+  return z.union([
+    unionType,
+    z.object({
       $eq: unionType,
       $ne: unionType,
       $in: arrayType,
@@ -102,5 +100,6 @@ export const createOperatorMap = (
       $gte: simpleType,
       $lt: simpleType,
       $lte: simpleType,
-  })
+    }),
+  ])
 }