From 3f8c5f6e63a949e4f5f519436e67c22296e375b2 Mon Sep 17 00:00:00 2001
From: milanmajchrak <milan.majchrak@dataquest.sk>
Date: Tue, 3 Nov 2026 10:39:11 +0100
Subject: [PATCH] VSB-TUO/Give required inputs of an optional complex field a
 required message

Port of dtq-dev PR 1667 (commit 718f7260b7).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 .../parsers/complex-field-parser.spec.ts      | 69 +++++++++++++++++++
 .../builder/parsers/complex-field-parser.ts   |  6 +-
 2 files changed, 74 insertions(+), 1 deletion(-)

diff --git a/src/app/shared/form/builder/parsers/complex-field-parser.spec.ts b/src/app/shared/form/builder/parsers/complex-field-parser.spec.ts
index 09f024bf87d..1c88bbc9a11 100644
--- a/src/app/shared/form/builder/parsers/complex-field-parser.spec.ts
+++ b/src/app/shared/form/builder/parsers/complex-field-parser.spec.ts
@@ -1,5 +1,9 @@
+import { TestBed } from '@angular/core/testing';
+import { DynamicFormService, DynamicFormValidationService } from '@ng-dynamic-forms/core';
 import { FormFieldModel } from '../models/form-field.model';
 import { ParserOptions } from './parser-options';
+import { DynamicComplexModel } from '../ds-dynamic-form-ui/models/ds-dynamic-complex.model';
+import { DsDynamicInputModel } from '../ds-dynamic-form-ui/models/ds-dynamic-input.model';
 import { DynamicRowArrayModel } from '../ds-dynamic-form-ui/models/ds-dynamic-row-array-model';
 import {ComplexFieldParser} from './complex-field-parser';
 import { getMockTranslateService } from '../../../mocks/translate.service.mock';
@@ -22,6 +26,9 @@ describe('ComplexFieldParser test suite', () => {
   };
   const separator = ';';
 
+  const requiredInputs = (complexModel: DynamicComplexModel) =>
+    (complexModel.group as DsDynamicInputModel[]).filter((input) => input.required);
+
   beforeEach(() => {
     field = {
       input: {
@@ -63,4 +70,66 @@ describe('ComplexFieldParser test suite', () => {
     expect(fieldModel instanceof DynamicRowArrayModel).toBe(true);
     expect(fieldModel.label).toBe(expectedValue);
   });
+
+  it('should keep the mandatory message of a mandatory field on its required inputs', () => {
+    field.mandatory = 'true';
+    field.mandatoryMessage = 'Please fill all the fields for the contact person.';
+    const parser = new ComplexFieldParser(submissionId, field, initFormValues, parserOptions, separator, [],
+      translateService);
+
+    const inputs = requiredInputs(parser.modelFactory());
+
+    expect(inputs.length).toBe(3);
+    inputs.forEach((input) =>
+      expect(input.errorMessages.required).toBe('Please fill all the fields for the contact person.'));
+  });
+
+  describe('an optional field with required inputs', () => {
+    let complexModel: DynamicComplexModel;
+
+    beforeEach(() => {
+      const fundingField = {
+        input: {
+          type: 'complex',
+        },
+        mandatory: false,
+        label: 'Funding',
+        repeatable: true,
+        selectableMetadata: [
+          {
+            metadata: 'local.sponsor',
+          },
+        ],
+        languageCodes: [],
+        complexDefinition: '[{"type":{"name":"type","value-pairs-name":"metashare_funding","input-type":"dropdown",' +
+          '"label":"Funding type","required":"true"}},{"code":{"name":"code","input-type":"autocomplete",' +
+          '"label":"Grant no. or funding project code","required":"true"}},{"orgname":{"name":"orgname",' +
+          '"input-type":"text","label":"Funding organization","required":"true"}},{"projname":{"name":"projname",' +
+          '"input-type":"autocomplete","label":"Funding project name","required":"true"}},{"openaire_id":' +
+          '{"name":"openaire_id","input-type":"text","label":"EU Project Identifier (OpenAIRE)","readonly":"true"}}]',
+      } as unknown as FormFieldModel;
+      const parser = new ComplexFieldParser(submissionId, fundingField, initFormValues, parserOptions, separator, [],
+        translateService);
+      complexModel = parser.modelFactory();
+    });
+
+    it('should give the required inputs the default required message', () => {
+      const inputs = requiredInputs(complexModel);
+
+      expect(inputs.length).toBe(4);
+      inputs.forEach((input) => expect(input.errorMessages.required).toBe('error.validation.required'));
+    });
+
+    it('should build the error messages of the empty required inputs', () => {
+      const formGroup = TestBed.inject(DynamicFormService).createFormGroup([complexModel]);
+      const validationService = TestBed.inject(DynamicFormValidationService);
+
+      requiredInputs(complexModel).forEach((input) => {
+        const control = formGroup.get([complexModel.id, input.id]);
+
+        expect(control.hasError('required')).toBe(true);
+        expect(validationService.createErrorMessages(control, input)).toEqual(['error.validation.required']);
+      });
+    });
+  });
 });
diff --git a/src/app/shared/form/builder/parsers/complex-field-parser.ts b/src/app/shared/form/builder/parsers/complex-field-parser.ts
index 33d14855ccc..773114ef28c 100644
--- a/src/app/shared/form/builder/parsers/complex-field-parser.ts
+++ b/src/app/shared/form/builder/parsers/complex-field-parser.ts
@@ -17,7 +17,7 @@ import {
   SPONSOR_METADATA_NAME,
 
 } from '../ds-dynamic-form-ui/models/ds-dynamic-complex.model';
-import { hasValue, isNotEmpty, isUndefined } from '../../../empty.util';
+import { hasValue, isEmpty, isNotEmpty, isUndefined } from '../../../empty.util';
 import { ParserOptions } from './parser-options';
 import {
   CONFIG_DATA,
@@ -160,6 +160,10 @@ export class ComplexFieldParser extends FieldParser {
       // required. It should be marked as required in the complex group for every input field.
       if (inputConfig.required) {
         this.markAsRequired(inputModel);
+        // an optional complex field has no mandatory message of its own
+        if (isEmpty(inputModel.errorMessages.required)) {
+          inputModel.errorMessages.required = 'error.validation.required';
+        }
       }
       concatGroup.group.push(inputModel);
     });