fix: delete custom relation on junction table delete/ fk column delete

packages/nocodb/src/models/Column.ts

@@ -692,6 +692,22 @@ export default class Column<T = any> implements ColumnType {
           },
         },
       );
+
+      // if custom relation then delete
+      if (
+        links.every((lk) => {
+          try {
+            return parseMetaProp(lk)?.custom;
+          } catch {
+            // ignore
+          }
+        })
+      ) {
+        for (const link of links) {
+          await Column.delete(link.id, ncMeta);
+        }
+      }
+
       if (links.length) {
         NcError.columnAssociatedWithLink(id);
       }

packages/nocodb/src/services/tables.service.ts

@@ -1,4 +1,4 @@
-import { Injectable } from '@nestjs/common';
+import {Injectable} from '@nestjs/common';
 import DOMPurify from 'isomorphic-dompurify';
 import {
   AppEvents,
@@ -11,28 +11,28 @@ import {
   RelationTypes,
   UITypes,
 } from 'nocodb-sdk';
-import { MetaDiffsService } from './meta-diffs.service';
-import { ColumnsService } from './columns.service';
+import {MetaDiffsService} from './meta-diffs.service';
+import {ColumnsService} from './columns.service';
 import type {
   ColumnType,
   NormalColumnRequestType,
   TableReqType,
   UserType,
 } from 'nocodb-sdk';
-import type { MetaService } from '~/meta/meta.service';
-import type { LinkToAnotherRecordColumn, User, View } from '~/models';
+import type {MetaService} from '~/meta/meta.service';
+import type {LinkToAnotherRecordColumn, User, View} from '~/models';
 import type { NcContext, NcRequest } from '~/interface/config';
-import { Base, Column, Model, ModelRoleVisibility } from '~/models';
-import { AppHooksService } from '~/services/app-hooks/app-hooks.service';
+import {Base, Column, Model, ModelRoleVisibility} from '~/models';
+import {AppHooksService} from '~/services/app-hooks/app-hooks.service';
 import ProjectMgrv2 from '~/db/sql-mgr/v2/ProjectMgrv2';
-import { NcError } from '~/helpers/catchError';
+import {NcError} from '~/helpers/catchError';
 import getColumnPropsFromUIDT from '~/helpers/getColumnPropsFromUIDT';
 import getColumnUiType from '~/helpers/getColumnUiType';
-import getTableNameAlias, { getColumnNameAlias } from '~/helpers/getTableName';
+import getTableNameAlias, {getColumnNameAlias} from '~/helpers/getTableName';
 import mapDefaultDisplayValue from '~/helpers/mapDefaultDisplayValue';
 import Noco from '~/Noco';
 import NcConnectionMgrv2 from '~/utils/common/NcConnectionMgrv2';
-import { sanitizeColumnName, validatePayload } from '~/helpers';
+import {sanitizeColumnName, validatePayload} from '~/helpers';
 import {
   getUniqueColumnAliasName,
   getUniqueColumnName,
@@ -44,7 +44,8 @@ export class TablesService {
     protected readonly metaDiffService: MetaDiffsService,
     protected readonly appHooksService: AppHooksService,
     protected readonly columnsService: ColumnsService,
-  ) {}
+  ) {
+  }
 
   async tableUpdate(
     context: NcContext,
@@ -212,9 +213,9 @@ export class TablesService {
               return (
                 isLinksOrLTAR(c) &&
                 (c.colOptions as LinkToAnotherRecordColumn).type ===
-                  RelationTypes.MANY_TO_MANY &&
+                RelationTypes.MANY_TO_MANY &&
                 (c.colOptions as LinkToAnotherRecordColumn).fk_mm_model_id ===
-                  table.id
+                table.id
               );
             });
           });
@@ -226,6 +227,19 @@ export class TablesService {
       );
     }
 
+    // if table is using in custom relation as junction table then delete all the relation
+    const relations = await Noco.ncMeta.metaList2(null, null, MetaTable.COL_RELATIONS, {
+      condition: {
+        fk_mm_model_id: table.id,
+      },
+    });
+
+    if (relations?.data?.list?.length) {
+      for (const relation of relations.data.list) {
+        await Column.delete(relation.fk_column_id);
+      }
+    }
+
     const base = await Base.getWithInfo(context, table.base_id);
     const source = base.sources.find((b) => b.id === table.source_id);
 
@@ -356,7 +370,7 @@ export class TablesService {
       'guest',
     ];
 
-    const defaultDisabled = roles.reduce((o, r) => ({ ...o, [r]: false }), {});
+    const defaultDisabled = roles.reduce((o, r) => ({...o, [r]: false}), {});
 
     let models =
       _models ||
@@ -380,7 +394,7 @@ export class TablesService {
           _tn: view.title,
           table_meta: model.meta,
           ...view,
-          disabled: { ...defaultDisabled },
+          disabled: {...defaultDisabled},
         };
       }
 
@@ -503,7 +517,7 @@ export class TablesService {
 
         if (!col || !col.system) {
           tableCreatePayLoad.columns.push({
-            ...(await getColumnPropsFromUIDT({ uidt } as any, source)),
+            ...(await getColumnPropsFromUIDT({uidt} as any, source)),
             column_name: colName,
             cn: colName,
             title: colAlias,
@@ -681,9 +695,9 @@ export class TablesService {
 
     let columns: Array<
       Omit<Column, 'column_name' | 'title'> & {
-        cn: string;
-        system?: boolean;
-      }
+      cn: string;
+      system?: boolean;
+    }
     >;
 
     if (!source.isMeta()) {