refactor: hide mm relation system columns from ui

packages/nc-gui/composables/useViewColumns.ts

@@ -1,4 +1,4 @@
-import { ViewTypes, isCreatedOrLastModifiedByCol, isSystemColumn } from 'nocodb-sdk'
+import { ViewTypes, isCreatedOrLastModifiedByCol, isMMSystemCol, isSystemColumn } from 'nocodb-sdk'
 import type { ColumnType, GridColumnReqType, GridColumnType, MapType, TableType, ViewType } from 'nocodb-sdk'
 import type { ComputedRef, Ref } from 'vue'
 import { computed, ref, storeToRefs, useBase, useNuxtApp, useRoles, useUndoRedo, watch } from '#imports'
@@ -72,7 +72,7 @@ const [useProvideViewColumns, useViewColumns] = useInjectionState(
         fields.value = meta.value?.columns
           ?.filter((column: ColumnType) => {
             // filter created by and last modified by system columns
-            if (isCreatedOrLastModifiedByCol(column) && column.system) return false
+            if ((isCreatedOrLastModifiedByCol(column) || isMMSystemCol(column)) && column.system) return false
             return true
           })
           .map((column: ColumnType) => {

packages/nocodb-sdk/src/lib/UITypes.ts

@@ -162,6 +162,14 @@ export function isCreatedOrLastModifiedByCol(
   );
 }
 
+export function isMMSystemCol(
+  col: (ColumnReqType | ColumnType) & { system?: number | boolean }
+) {
+  return (
+    col.system && [UITypes.LinkToAnotherRecord].includes(<UITypes>col.uidt)
+  );
+}
+
 export function isLinksOrLTAR(
   colOrUidt: ColumnType | { uidt: UITypes | string } | UITypes | string
 ) {

packages/nocodb-sdk/src/lib/index.ts

@@ -16,6 +16,7 @@ export {
   isLinksOrLTAR,
   isCreatedOrLastModifiedTimeCol,
   isCreatedOrLastModifiedByCol,
+  isMMSystemCol
 } from '~/lib/UITypes';
 export { default as CustomAPI, FileType } from '~/lib/CustomAPI';
 export { default as TemplateGenerator } from '~/lib/TemplateGenerator';