Fix count helper function for self-referencing relations (#22297)

Co-authored-by: Pascal Jufer <pascal-jufer@bluewin.ch>

.changeset/chilly-papayas-drive.md

@@ -0,0 +1,5 @@
+---
+'@directus/api': patch
+---
+
+Fixed count() function filter for self referencing relations

api/src/database/helpers/fn/types.ts

@@ -1,6 +1,6 @@
 import type { Query, SchemaOverview } from '@directus/types';
 import type { Knex } from 'knex';
-import { applyFilter } from '../../../utils/apply-query.js';
+import { applyFilter, generateAlias } from '../../../utils/apply-query.js';
 import { DatabaseHelper } from '../types.js';
 
 export type FnHelperOptions = {
@@ -41,10 +41,12 @@ export abstract class FnHelper extends DatabaseHelper {
 			throw new Error(`Field ${collectionName}.${column} isn't a nested relational collection`);
 		}
 
+		const alias = generateAlias();
+
 		let countQuery = this.knex
 			.count('*')
-			.from(relation.collection)
-			.where(relation.field, '=', this.knex.raw(`??.??`, [table, currentPrimary]));
+			.from({ [alias]: relation.collection })
+			.where(this.knex.raw(`??.??`, [alias, relation.field]), '=', this.knex.raw(`??.??`, [table, currentPrimary]));
 
 		if (options?.query?.filter) {
 			countQuery = applyFilter(this.knex, this.schema, countQuery, options.query.filter, relation.collection, {}).query;

api/src/database/run-ast.ts

@@ -6,8 +6,7 @@ import { clone, cloneDeep, isNil, merge, pick, uniq } from 'lodash-es';
 import { PayloadService } from '../services/payload.js';
 import type { AST, FieldNode, FunctionFieldNode, M2ONode, NestedCollectionNode } from '../types/ast.js';
 import { applyFunctionToColumnName } from '../utils/apply-function-to-column-name.js';
-import type { ColumnSortRecord } from '../utils/apply-query.js';
-import applyQuery, { applyLimit, applySort, generateAlias } from '../utils/apply-query.js';
+import applyQuery, { applyLimit, applySort, generateAlias, type ColumnSortRecord } from '../utils/apply-query.js';
 import { getCollectionFromAlias } from '../utils/get-collection-from-alias.js';
 import type { AliasMap } from '../utils/get-column-path.js';
 import { getColumn } from '../utils/get-column.js';