fix: allow deletion of link columns with missing mm table

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

@@ -2179,9 +2179,11 @@ export class ColumnsService {
                     colOpt.type === 'mm' &&
                     colOpt.fk_parent_column_id === childColumn.id &&
                     colOpt.fk_child_column_id === parentColumn.id &&
-                    colOpt.fk_mm_model_id === mmTable.id &&
-                    colOpt.fk_mm_parent_column_id === mmChildCol.id &&
-                    colOpt.fk_mm_child_column_id === mmParentCol.id
+                    colOpt.fk_mm_model_id === relationColOpt.fk_mm_model_id &&
+                    colOpt.fk_mm_parent_column_id ===
+                      relationColOpt.fk_mm_child_column_id &&
+                    colOpt.fk_mm_child_column_id ===
+                      relationColOpt.fk_mm_parent_column_id
                   ) {
                     await Column.delete(c.id, ncMeta);
                     break;
@@ -2190,6 +2192,7 @@ export class ColumnsService {
 
                 await Column.delete(relationColOpt.fk_column_id, ncMeta);
 
+                if (mmTable) {
                   // delete bt columns in m2m table
                   await mmTable.getColumns(ncMeta);
                   for (const c of mmTable.columns) {
@@ -2200,6 +2203,7 @@ export class ColumnsService {
                       await Column.delete(c.id, ncMeta);
                     }
                   }
+                }
 
                 // delete hm columns in parent table
                 await parentTable.getColumns(ncMeta);
@@ -2207,7 +2211,9 @@ export class ColumnsService {
                   if (!isLinksOrLTAR(c.uidt)) continue;
                   const colOpt =
                     await c.getColOptions<LinkToAnotherRecordColumn>(ncMeta);
-                  if (colOpt.fk_related_model_id === mmTable.id) {
+                  if (
+                    colOpt.fk_related_model_id === relationColOpt.fk_mm_model_id
+                  ) {
                     await Column.delete(c.id, ncMeta);
                   }
                 }
@@ -2218,11 +2224,14 @@ export class ColumnsService {
                   if (!isLinksOrLTAR(c.uidt)) continue;
                   const colOpt =
                     await c.getColOptions<LinkToAnotherRecordColumn>(ncMeta);
-                  if (colOpt.fk_related_model_id === mmTable.id) {
+                  if (
+                    colOpt.fk_related_model_id === relationColOpt.fk_mm_model_id
+                  ) {
                     await Column.delete(c.id, ncMeta);
                   }
                 }
 
+                if (mmTable) {
                   // retrieve columns in m2m table again
                   await mmTable.getColumns(ncMeta);
 
@@ -2234,6 +2243,7 @@ export class ColumnsService {
                     await mmTable.delete(ncMeta);
                   }
                 }
+              }
               break;
           }
         }
@@ -2341,6 +2351,7 @@ export class ColumnsService {
     },
     ignoreFkDelete = false,
   ) => {
+    if (childTable) {
       let foreignKeyName;
 
       // if relationColOpt is not provided, extract it from child table
@@ -2379,6 +2390,7 @@ export class ColumnsService {
           console.log(e.message);
         }
       }
+    }
 
     if (!relationColOpt) return;
     const columnsInRelatedTable: Column[] = await relationColOpt