refactor: swagger schema correction - use array if it's hm/mm relation

Signed-off-by: Pranav C <pranavxc@gmail.com>

packages/nocodb/src/services/api-docs/swagger/getSwaggerColumnMetas.ts

@@ -1,4 +1,4 @@
-import { UITypes } from 'nocodb-sdk';
+import { RelationTypes, UITypes } from 'nocodb-sdk';
 import type { Base, Column, LinkToAnotherRecordColumn } from '~/models';
 import SwaggerTypes from '~/db/sql-mgr/code/routers/xc-ts/SwaggerTypes';
 import Noco from '~/Noco';
@@ -26,8 +26,15 @@ export default async (
             );
             if (colOpt) {
               const relTable = await colOpt.getRelatedTable(ncMeta);
-              field.type = undefined;
-              field.$ref = `#/components/schemas/${relTable.title}Request`;
+              if (colOpt.type === RelationTypes.BELONGS_TO) {
+                field.type = undefined;
+                field.$ref = `#/components/schemas/${relTable.title}Request`;
+              } else {
+                field.type = 'array';
+                field.items = {
+                  $ref: `#/components/schemas/${relTable.title}Request`,
+                };
+              }
             }
           }
           break;