feat: refactor forms to use reactive forms with signals for improved state management

frontend/src/app/components/apartment-form/apartment-form.html

@@ -16,6 +16,7 @@
     </div>
   </header>
   <form
+    [formRoot]="apartmentForm"
     (submit)="save(); $event.preventDefault()"
     class="apartment-form"
     [attr.aria-busy]="saving()"
@@ -36,22 +37,17 @@
           ><input
             matInput
             type="text"
-            name="name"
+            id="name"
-            [ngModel]="name()"
+            [formField]="apartmentForm.name"
-            (ngModelChange)="name.set($event)"
             placeholder="T2 Paris 15"
-            required
         /></mat-form-field>
         <mat-form-field appearance="outline"
           ><mat-label>Prix d'acquisition</mat-label
           ><input
             matInput
             type="number"
-            name="purchasePrice"
+            id="purchasePrice"
-            [ngModel]="purchasePrice()"
+            [formField]="apartmentForm.purchasePrice"
-            (ngModelChange)="purchasePrice.set($event)"
-            min="1"
-            required
           /><span matTextSuffix>€</span></mat-form-field
         >
         <mat-form-field appearance="outline" class="full-field"
@@ -59,19 +55,16 @@
           ><input
             matInput
             type="text"
-            name="address"
+            id="address"
-            [ngModel]="address()"
+            [formField]="apartmentForm.address"
-            (ngModelChange)="address.set($event)"
             placeholder="45 rue des Entrepreneurs, 75015 Paris"
-            required
         /></mat-form-field>
         <mat-form-field appearance="outline" class="full-field"
           ><mat-label>Description ou notes</mat-label
           ><textarea
             matInput
-            name="description"
+            id="description"
-            [ngModel]="description()"
+            [formField]="apartmentForm.description"
-            (ngModelChange)="description.set($event)"
             rows="4"
             placeholder="Étage, agencement, équipements…"
           ></textarea>

frontend/src/app/components/apartment-form/apartment-form.spec.ts

@@ -15,8 +15,8 @@ describe('ApartmentForm', () => {
     fixture.detectChanges();
 
     const form = fixture.componentInstance;
-    expect(form.name()).toBe('T2 Paris 15');
+    expect(form.apartmentModel().name).toBe('T2 Paris 15');
-    expect(form.purchasePrice()).toBe(250000);
+    expect(form.apartmentModel().purchasePrice).toBe(250000);
   });
 
   it('shows a validation error instead of emitting an incomplete apartment', () => {
@@ -36,10 +36,12 @@ describe('ApartmentForm', () => {
     const form = fixture.componentInstance;
     const saved = vi.fn();
     form.saved.subscribe(saved);
-    form.name.set(' T2 Paris 15 ');
+    form.apartmentModel.set({
-    form.address.set(' 45 rue des Entrepreneurs ');
+      name: ' T2 Paris 15 ',
-    form.purchasePrice.set(250000);
+      address: ' 45 rue des Entrepreneurs ',
-    form.description.set(' Cinquième étage ');
+      purchasePrice: 250000,
+      description: ' Cinquième étage ',
+    });
 
     form.save();
 
@@ -70,15 +72,18 @@ describe('ApartmentForm', () => {
     fixture.detectChanges();
     await fixture.whenStable();
     const form = fixture.componentInstance;
-    form.name.set('T2 rénové');
+    form.apartmentModel.set({
-    form.address.set('45 rue des Entrepreneurs');
+      name: 'T2 rénové',
-    form.purchasePrice.set(265000);
+      address: '45 rue des Entrepreneurs',
+      purchasePrice: 265000,
+      description: '',
+    });
     fixture.componentRef.setInput('saveError', 'Impossible d’enregistrer cet appartement.');
     fixture.detectChanges();
     await fixture.whenStable();
 
-    expect(fixture.nativeElement.querySelector('input[name=name]').value).toBe('T2 rénové');
+    expect(fixture.nativeElement.querySelector('input#name').value).toBe('T2 rénové');
-    expect(fixture.nativeElement.querySelector('input[name=address]').value).toBe(
+    expect(fixture.nativeElement.querySelector('input#address').value).toBe(
       '45 rue des Entrepreneurs',
     );
     expect(fixture.nativeElement.textContent).toContain(

frontend/src/app/components/apartment-form/apartment-form.ts

@@ -1,5 +1,6 @@
 import { Component, effect, input, output, signal } from '@angular/core';
 import { FormsModule } from '@angular/forms';
+import { FormRoot, FormField, form, required, min } from '@angular/forms/signals';
 import { MatButtonModule } from '@angular/material/button';
 import { MatFormFieldModule } from '@angular/material/form-field';
 import { MatInputModule } from '@angular/material/input';
@@ -10,6 +11,8 @@ import { Apartment } from '../../services/apartment.service';
   selector: 'app-apartment-form',
   imports: [
     FormsModule,
+    FormRoot,
+    FormField,
     MatButtonModule,
     MatFormFieldModule,
     MatInputModule,
@@ -25,10 +28,20 @@ export class ApartmentForm {
   readonly closed = output<void>();
   readonly saved = output<Apartment>();
 
-  readonly name = signal('');
+  readonly apartmentModel = signal<Apartment>({
-  readonly address = signal('');
+    name: '',
-  readonly purchasePrice = signal(0);
+    address: '',
-  readonly description = signal('');
+    purchasePrice: 0,
+    description: '',
+  });
+
+  readonly apartmentForm = form(this.apartmentModel, (f) => {
+    required(f.name, { message: 'Veuillez remplir tous les champs obligatoires (Nom, Adresse, Prix > 0).' });
+    required(f.address, { message: 'Veuillez remplir tous les champs obligatoires (Nom, Adresse, Prix > 0).' });
+    required(f.purchasePrice, { message: 'Veuillez remplir tous les champs obligatoires (Nom, Adresse, Prix > 0).' });
+    min(f.purchasePrice, 1, { message: 'Veuillez remplir tous les champs obligatoires (Nom, Adresse, Prix > 0).' });
+  });
+
   readonly error = signal('');
 
   constructor() {
@@ -37,24 +50,30 @@ export class ApartmentForm {
 
   save(): void {
     if (this.saving()) return;
-    if (!this.name().trim() || !this.address().trim() || this.purchasePrice() <= 0) {
+    this.apartmentForm().markAsTouched();
-      this.error.set('Veuillez remplir tous les champs obligatoires (Nom, Adresse, Prix > 0).');
+    if (this.apartmentForm().invalid()) {
+      const firstError = this.apartmentForm().errorSummary()[0];
+      this.error.set(firstError?.message ?? 'Veuillez corriger les erreurs.');
       return;
     }
 
     this.saved.emit({
-      name: this.name().trim(),
+      id: this.apartment()?.id,
-      address: this.address().trim(),
+      name: this.apartmentModel().name.trim(),
-      purchasePrice: this.purchasePrice(),
+      address: this.apartmentModel().address.trim(),
-      description: this.description().trim(),
+      purchasePrice: this.apartmentModel().purchasePrice,
+      description: this.apartmentModel().description.trim(),
     });
   }
 
   private resetForm(apartment: Apartment | null): void {
-    this.name.set(apartment?.name ?? '');
+    this.apartmentModel.set({
-    this.address.set(apartment?.address ?? '');
+      id: apartment?.id,
-    this.purchasePrice.set(apartment?.purchasePrice ?? 0);
+      name: apartment?.name ?? '',
-    this.description.set(apartment?.description ?? '');
+      address: apartment?.address ?? '',
+      purchasePrice: apartment?.purchasePrice ?? 0,
+      description: apartment?.description ?? '',
+    });
     this.error.set('');
   }
 }

frontend/src/app/components/guarantor-form/guarantor-form.html

@@ -1,37 +1,30 @@
 <form
   class="guarantor-form"
-  #guarantorForm="ngForm"
+  [formRoot]="guarantorForm"
-  ngNativeValidate
+  (ngSubmit)="save()"
-  (ngSubmit)="save(guarantorForm)"
 >
   <div class="form-grid guarantor-fields">
     <mat-form-field appearance="outline"
       ><mat-label>Prénom du garant</mat-label
       ><input
         matInput
-        name="guarantorFirstName"
+        id="guarantorFirstName"
-        [ngModel]="firstName()"
+        [formField]="guarantorForm.firstName"
-        (ngModelChange)="firstName.set($event)"
-        required
     /></mat-form-field>
     <mat-form-field appearance="outline"
       ><mat-label>Nom du garant</mat-label
       ><input
         matInput
-        name="guarantorLastName"
+        id="guarantorLastName"
-        [ngModel]="lastName()"
+        [formField]="guarantorForm.lastName"
-        (ngModelChange)="lastName.set($event)"
-        required
     /></mat-form-field>
     <mat-form-field appearance="outline"
       ><mat-label>E-mail du garant</mat-label
       ><input
         matInput
         type="email"
-        name="guarantorEmail"
+        id="guarantorEmail"
-        [ngModel]="email()"
+        [formField]="guarantorForm.email"
-        (ngModelChange)="email.set($event)"
-        required
         autocomplete="email"
     /></mat-form-field>
     <mat-form-field appearance="outline"
@@ -39,19 +32,16 @@
       ><input
         matInput
         type="tel"
-        name="guarantorPhone"
+        id="guarantorPhone"
-        [ngModel]="phone()"
+        [formField]="guarantorForm.phone"
-        (ngModelChange)="phone.set($event)"
-        pattern="^(?:(?:0\d(?:[ .-]?\d){8})|(?:(?:\+|00)\d(?:[ .()-]?\d){7,14}))$"
         autocomplete="tel"
     /></mat-form-field>
     <mat-form-field appearance="outline" class="full-field"
       ><mat-label>Adresse du garant</mat-label
       ><input
         matInput
-        name="guarantorAddress"
+        id="guarantorAddress"
-        [ngModel]="address()"
+        [formField]="guarantorForm.address"
-        (ngModelChange)="address.set($event)"
     /></mat-form-field>
   </div>
   <button mat-stroked-button type="submit" class="add-guarantor">Ajouter le garant</button>

frontend/src/app/components/guarantor-form/guarantor-form.spec.ts

@@ -5,13 +5,12 @@ import { GuarantorForm } from './guarantor-form';
 describe('GuarantorForm', () => {
   it('marks an invalid form as touched without submitting it', () => {
     const fixture = TestBed.createComponent(GuarantorForm);
-    const markAllAsTouched = vi.fn();
     const submitted = vi.fn();
     fixture.componentInstance.submitted.subscribe(submitted);
 
-    fixture.componentInstance.save({ invalid: true, control: { markAllAsTouched } } as never);
+    fixture.componentInstance.save();
 
-    expect(markAllAsTouched).toHaveBeenCalled();
+    expect(fixture.componentInstance.guarantorForm().touched()).toBe(true);
     expect(submitted).not.toHaveBeenCalled();
   });
 
@@ -19,20 +18,24 @@ describe('GuarantorForm', () => {
     const fixture = TestBed.createComponent(GuarantorForm);
     const component = fixture.componentInstance;
     const submitted = vi.fn();
-    const resetForm = vi.fn();
     component.submitted.subscribe(submitted);
-    component.firstName.set(' Alex ');
+    component.guarantorModel.set({
-    component.lastName.set(' Durand ');
+      firstName: ' Alex ',
-    component.email.set(' alex@example.com ');
+      lastName: ' Durand ',
-    component.phone.set(' 0600000000 ');
+      email: ' alex@example.com ',
-    component.address.set(' 1 rue de Paris ');
+      phone: ' 0600000000 ',
+      address: ' 1 rue de Paris ',
+    });
 
-    component.save({ invalid: false, resetForm } as never);
+    component.save();
 
     expect(submitted).toHaveBeenCalledWith({
-      firstName: 'Alex', lastName: 'Durand', email: 'alex@example.com', phone: '0600000000', address: '1 rue de Paris',
+      firstName: 'Alex',
+      lastName: 'Durand',
+      email: 'alex@example.com',
+      phone: '0600000000',
+      address: '1 rue de Paris',
     });
-    expect(component.firstName()).toBe('');
+    expect(component.guarantorModel().firstName).toBe('');
-    expect(resetForm).toHaveBeenCalled();
   });
 });

frontend/src/app/components/guarantor-form/guarantor-form.ts

@@ -1,5 +1,6 @@
 import { Component, output, signal } from '@angular/core';
-import { FormsModule, NgForm } from '@angular/forms';
+import { FormsModule } from '@angular/forms';
+import { FormRoot, FormField, form, required, email } from '@angular/forms/signals';
 import { MatButtonModule } from '@angular/material/button';
 import { MatFormFieldModule } from '@angular/material/form-field';
 import { MatInputModule } from '@angular/material/input';
@@ -7,35 +8,65 @@ import { Guarantor } from '../../services/lease.service';
 
 @Component({
   selector: 'app-guarantor-form',
-  imports: [FormsModule, MatButtonModule, MatFormFieldModule, MatInputModule],
+  imports: [
+    FormsModule,
+    FormRoot,
+    FormField,
+    MatButtonModule,
+    MatFormFieldModule,
+    MatInputModule,
+  ],
   templateUrl: './guarantor-form.html',
   styleUrl: './guarantor-form.css',
 })
 export class GuarantorForm {
   readonly submitted = output<Guarantor>();
-  readonly firstName = signal('');
-  readonly lastName = signal('');
-  readonly email = signal('');
-  readonly phone = signal('');
-  readonly address = signal('');
 
-  save(form: NgForm): void {
+  readonly guarantorModel = signal<Guarantor>({
-    if (form.invalid) {
+    firstName: '',
-      form.control.markAllAsTouched();
+    lastName: '',
+    email: '',
+    phone: '',
+    address: '',
+  });
+
+  readonly guarantorForm = form(this.guarantorModel, (f) => {
+    required(f.firstName);
+    required(f.lastName);
+    required(f.email);
+    email(f.email);
+  });
+
+  save(): void {
+    this.guarantorModel.update((m) => ({
+      firstName: m.firstName.trim(),
+      lastName: m.lastName.trim(),
+      email: m.email.trim(),
+      phone: m.phone.trim(),
+      address: m.address.trim(),
+    }));
+
+    this.guarantorForm().markAsTouched();
+    if (this.guarantorForm().invalid()) {
       return;
     }
+
+    const modelVal = this.guarantorModel();
     this.submitted.emit({
-      firstName: this.firstName().trim(),
+      firstName: modelVal.firstName,
-      lastName: this.lastName().trim(),
+      lastName: modelVal.lastName,
-      email: this.email().trim(),
+      email: modelVal.email,
-      phone: this.phone().trim(),
+      phone: modelVal.phone,
-      address: this.address().trim(),
+      address: modelVal.address,
     });
-    this.firstName.set('');
+
-    this.lastName.set('');
+    this.guarantorModel.set({
-    this.email.set('');
+      firstName: '',
-    this.phone.set('');
+      lastName: '',
-    this.address.set('');
+      email: '',
-    form.resetForm();
+      phone: '',
+      address: '',
+    });
+    this.guarantorForm().reset();
   }
 }

frontend/src/app/components/lease-form/lease-form.html

@@ -18,9 +18,8 @@
   <form
     id="lease-details"
     class="lease-form"
-    #leaseForm="ngForm"
+    [formRoot]="leaseForm"
-    ngNativeValidate
+    (ngSubmit)="save()"
-    (ngSubmit)="save(leaseForm)"
     [attr.aria-busy]="saving()"
   >
     @if (saveError()) {
@@ -45,10 +44,8 @@
           <mat-form-field appearance="outline"
             ><mat-label>Appartement</mat-label
             ><mat-select
-              name="apartmentId"
+              id="apartmentId"
-              [ngModel]="apartmentId()"
+              [formField]="leaseForm.apartmentId"
-              (ngModelChange)="apartmentId.set($event)"
-              required
               ><mat-option value="">Sélectionnez un appartement</mat-option>
               @for (apartment of apartments(); track apartment.id) {
                 <mat-option [value]="apartment.id">{{ apartment.name }}</mat-option>
@@ -58,11 +55,9 @@
           <mat-form-field appearance="outline"
             ><mat-label>Locataires</mat-label
             ><mat-select
-              name="tenantIds"
+              id="tenantIds"
-              [ngModel]="tenantIds()"
+              [formField]="leaseForm.tenantIds"
-              (ngModelChange)="tenantIds.set($event)"
               multiple
-              required
             >
               @for (tenant of tenants(); track tenant.id) {
                 <mat-option [value]="tenant.id"
@@ -86,12 +81,10 @@
             ><mat-label>Date de début</mat-label
             ><input
               matInput
+              id="startDate"
               [matDatepicker]="startDatePicker"
               [matDatepickerFilter]="dateFilter"
-              name="startDate"
+              [formField]="$any(leaseForm.startDate)" /><mat-datepicker-toggle
-              [ngModel]="startDate()"
-              (ngModelChange)="startDate.set($event)"
-              required /><mat-datepicker-toggle
               matIconSuffix
               [for]="startDatePicker" /><mat-datepicker #startDatePicker
           /></mat-form-field>
@@ -99,13 +92,11 @@
             ><mat-label>Date de fin</mat-label
             ><input
               matInput
+              id="endDate"
               [matDatepicker]="endDatePicker"
               [matDatepickerFilter]="dateFilter"
-              [min]="startDate()"
+              [min]="leaseModel().startDate"
-              name="endDate"
+              [formField]="$any(leaseForm.endDate)" /><mat-datepicker-toggle
-              [ngModel]="endDate()"
-              (ngModelChange)="endDate.set($event)"
-              required /><mat-datepicker-toggle
               matIconSuffix
               [for]="endDatePicker" /><mat-datepicker #endDatePicker
           /></mat-form-field>
@@ -114,11 +105,8 @@
             ><input
               matInput
               type="number"
-              name="monthlyRent"
+              id="monthlyRent"
-              [ngModel]="monthlyRent()"
+              [formField]="leaseForm.monthlyRent"
-              (ngModelChange)="monthlyRent.set($event)"
-              min="1"
-              required
             /><span matTextSuffix>€</span></mat-form-field
           >
           <mat-form-field appearance="outline"
@@ -126,11 +114,8 @@
             ><input
               matInput
               type="number"
-              name="monthlyCharges"
+              id="monthlyCharges"
-              [ngModel]="monthlyCharges()"
+              [formField]="leaseForm.monthlyCharges"
-              (ngModelChange)="monthlyCharges.set($event)"
-              min="0"
-              required
             /><span matTextSuffix>€</span></mat-form-field
           >
           <mat-form-field appearance="outline"
@@ -138,11 +123,8 @@
             ><input
               matInput
               type="number"
-              name="securityDeposit"
+              id="securityDeposit"
-              [ngModel]="securityDeposit()"
+              [formField]="leaseForm.securityDeposit"
-              (ngModelChange)="securityDeposit.set($event)"
-              min="0"
-              required
             /><span matTextSuffix>€</span></mat-form-field
           >
         </div>

frontend/src/app/components/lease-form/lease-form.spec.ts

@@ -9,17 +9,19 @@ describe('LeaseForm', () => {
     fixture.componentRef.setInput('apartments', []);
     fixture.componentRef.setInput('tenants', []);
     const component = fixture.componentInstance;
-    component.apartmentId.set('apartment-1');
+    component.leaseModel.set({
-    component.tenantIds.set(['tenant-1']);
+      apartmentId: 'apartment-1',
-    component.startDate.set(new Date(2026, 8, 1));
+      tenantIds: ['tenant-1'],
-    component.endDate.set(new Date(2027, 7, 31));
+      startDate: new Date(2026, 8, 1),
-    component.monthlyRent.set(850);
+      endDate: new Date(2027, 7, 31),
-    component.monthlyCharges.set(50);
+      monthlyRent: 850,
-    component.securityDeposit.set(850);
+      monthlyCharges: 50,
+      securityDeposit: 850,
+    });
     let startDate = '';
     component.submitted.subscribe((lease) => (startDate = lease.startDate));
 
-    component.save({ invalid: false } as never);
+    component.save();
 
     expect(startDate).toBe('2026-09-01');
   });

frontend/src/app/components/lease-form/lease-form.ts

@@ -1,5 +1,6 @@
 import { Component, input, output, signal } from '@angular/core';
-import { FormsModule, NgForm } from '@angular/forms';
+import { FormsModule } from '@angular/forms';
+import { FormRoot, FormField, form, required, min } from '@angular/forms/signals';
 import { MatButtonModule } from '@angular/material/button';
 import { MatDatepickerModule } from '@angular/material/datepicker';
 import { MatFormFieldModule } from '@angular/material/form-field';
@@ -15,6 +16,8 @@ import { GuarantorForm } from '../guarantor-form/guarantor-form';
   selector: 'app-lease-form',
   imports: [
     FormsModule,
+    FormRoot,
+    FormField,
     MatButtonModule,
     MatDatepickerModule,
     MatFormFieldModule,
@@ -34,24 +37,39 @@ export class LeaseForm {
   readonly saveError = input('');
   readonly cancelled = output<void>();
   readonly submitted = output<Lease>();
-  readonly apartmentId = signal('');
+
-  readonly tenantIds = signal<string[]>([]);
+  readonly leaseModel = signal({
-  readonly startDate = signal<Date | null>(null);
+    apartmentId: '',
-  readonly endDate = signal<Date | null>(null);
+    tenantIds: [] as string[],
-  readonly monthlyRent = signal(0);
+    startDate: null as Date | null,
-  readonly monthlyCharges = signal(0);
+    endDate: null as Date | null,
-  readonly securityDeposit = signal(0);
+    monthlyRent: 0,
+    monthlyCharges: 0,
+    securityDeposit: 0,
+  });
+
+  readonly leaseForm = form(this.leaseModel, (f) => {
+    required(f.apartmentId);
+    required(f.tenantIds);
+    required(f.startDate);
+    required(f.endDate);
+    required(f.monthlyRent);
+    min(f.monthlyRent, 1);
+    required(f.monthlyCharges);
+    required(f.securityDeposit);
+  });
+
   readonly guarantors = signal<Guarantor[]>([]);
   readonly error = signal('');
 
   readonly dateFilter = (d: Date | null): boolean => {
     if (!d) return false;
-    const aptId = this.apartmentId();
+    const aptId = this.leaseModel().apartmentId;
     if (!aptId) return true;
 
     const time = new Date(d.getFullYear(), d.getMonth(), d.getDate()).getTime();
 
-    const overlapping = this.leases().some(lease => {
+    const overlapping = this.leases().some((lease) => {
       if (lease.apartmentId !== aptId) return false;
       const [startYear, startMonth, startDay] = lease.startDate.split('-').map(Number);
       const [endYear, endMonth, endDay] = lease.endDate.split('-').map(Number);
@@ -72,25 +90,26 @@ export class LeaseForm {
     );
   }
 
-  save(form: NgForm): void {
+  save(): void {
     if (this.saving()) return;
-    if (form.invalid) {
+    this.leaseForm().markAsTouched();
-      form.control.markAllAsTouched();
+    if (this.leaseForm().invalid()) {
       return;
     }
-    if (this.endDate()! < this.startDate()!) {
+    const modelVal = this.leaseModel();
+    if (modelVal.endDate! < modelVal.startDate!) {
       this.error.set('La date de fin doit être postérieure à la date de début.');
       return;
     }
     this.submitted.emit({
-      apartmentId: this.apartmentId(),
+      apartmentId: modelVal.apartmentId,
-      tenantIds: this.tenantIds(),
+      tenantIds: modelVal.tenantIds,
       guarantors: this.guarantors(),
-      startDate: this.toIsoDate(this.startDate()!),
+      startDate: this.toIsoDate(modelVal.startDate!),
-      endDate: this.toIsoDate(this.endDate()!),
+      endDate: this.toIsoDate(modelVal.endDate!),
-      monthlyRent: this.monthlyRent(),
+      monthlyRent: modelVal.monthlyRent,
-      monthlyCharges: this.monthlyCharges(),
+      monthlyCharges: modelVal.monthlyCharges,
-      securityDeposit: this.securityDeposit(),
+      securityDeposit: modelVal.securityDeposit,
       status: 'ACTIVE',
     });
   }

frontend/src/app/components/tenant-form/tenant-form.html

@@ -17,9 +17,8 @@
   </header>
   <form
     class="entity-form"
-    #tenantForm="ngForm"
+    [formRoot]="tenantForm"
-    ngNativeValidate
+    (ngSubmit)="save()"
-    (ngSubmit)="save(tenantForm)"
     [attr.aria-busy]="saving()"
   >
     @if (saveError()) {
@@ -34,29 +33,23 @@
           ><mat-label>Prénom</mat-label
           ><input
             matInput
-            name="firstName"
+            id="firstName"
-            [ngModel]="firstName()"
+            [formField]="tenantForm.firstName"
-            (ngModelChange)="firstName.set($event)"
-            required
         /></mat-form-field>
         <mat-form-field appearance="outline"
           ><mat-label>Nom</mat-label
           ><input
             matInput
-            name="lastName"
+            id="lastName"
-            [ngModel]="lastName()"
+            [formField]="tenantForm.lastName"
-            (ngModelChange)="lastName.set($event)"
-            required
         /></mat-form-field>
         <mat-form-field appearance="outline"
           ><mat-label>E-mail</mat-label
           ><input
             matInput
             type="email"
-            name="email"
+            id="email"
-            [ngModel]="email()"
+            [formField]="tenantForm.email"
-            (ngModelChange)="email.set($event)"
-            required
             autocomplete="email"
         /></mat-form-field>
         <mat-form-field appearance="outline"
@@ -64,19 +57,16 @@
           ><input
             matInput
             type="tel"
-            name="phone"
+            id="phone"
-            [ngModel]="phone()"
+            [formField]="tenantForm.phone"
-            (ngModelChange)="phone.set($event)"
-            pattern="^(?:(?:0\d(?:[ .-]?\d){8})|(?:(?:\+|00)\d(?:[ .()-]?\d){7,14}))$"
             autocomplete="tel"
         /></mat-form-field>
         <mat-form-field appearance="outline" class="full-field"
           ><mat-label>Adresse complète</mat-label
           ><input
             matInput
-            name="address"
+            id="address"
-            [ngModel]="address()"
+            [formField]="tenantForm.address"
-            (ngModelChange)="address.set($event)"
         /></mat-form-field>
       </div>
       <div class="form-actions">

frontend/src/app/components/tenant-form/tenant-form.spec.ts

@@ -6,13 +6,17 @@ describe('TenantForm', () => {
   it('emits a trimmed tenant through its small interface', () => {
     const fixture = TestBed.createComponent(TenantForm);
     const component = fixture.componentInstance;
-    component.firstName.set(' Camille ');
+    component.tenantModel.set({
-    component.lastName.set(' Martin ');
+      firstName: ' Camille ',
-    component.email.set(' camille@example.com ');
+      lastName: ' Martin ',
+      email: ' camille@example.com ',
+      phone: '0600000000',
+      address: '',
+    });
     let firstName = '';
     component.submitted.subscribe((request) => (firstName = request.tenant.firstName));
 
-    component.save({ invalid: false } as never);
+    component.save();
 
     expect(firstName).toBe('Camille');
   });
@@ -20,17 +24,23 @@ describe('TenantForm', () => {
   it('loads an existing tenant and leaves invalid data untouched', () => {
     const fixture = TestBed.createComponent(TenantForm);
     fixture.componentRef.setInput('tenant', {
-      id: 'tenant-1', firstName: 'Camille', lastName: 'Martin', email: 'camille@example.com', phone: '0600000000', address: '1 rue de Paris',
+      id: 'tenant-1',
+      firstName: 'Camille',
+      lastName: 'Martin',
+      email: 'camille@example.com',
+      phone: '0600000000',
+      address: '1 rue de Paris',
     });
     fixture.detectChanges();
-    const markAllAsTouched = vi.fn();
     const submitted = vi.fn();
     fixture.componentInstance.submitted.subscribe(submitted);
 
-    fixture.componentInstance.save({ invalid: true, control: { markAllAsTouched } } as never);
+    // Make the form invalid (invalid email)
+    fixture.componentInstance.tenantModel.update((t) => ({ ...t, email: 'invalid-email' }));
+    fixture.componentInstance.save();
 
-    expect(fixture.componentInstance.firstName()).toBe('Camille');
+    expect(fixture.componentInstance.tenantModel().firstName).toBe('Camille');
-    expect(markAllAsTouched).toHaveBeenCalled();
+    expect(fixture.componentInstance.tenantForm().touched()).toBe(true);
     expect(submitted).not.toHaveBeenCalled();
   });
 });

frontend/src/app/components/tenant-form/tenant-form.ts

@@ -1,5 +1,6 @@
 import { Component, effect, input, output, signal } from '@angular/core';
-import { FormsModule, NgForm } from '@angular/forms';
+import { FormsModule } from '@angular/forms';
+import { FormRoot, FormField, form, required, email } from '@angular/forms/signals';
 import { MatButtonModule } from '@angular/material/button';
 import { MatFormFieldModule } from '@angular/material/form-field';
 import { MatInputModule } from '@angular/material/input';
@@ -15,6 +16,8 @@ export interface TenantSaveRequest {
   selector: 'app-tenant-form',
   imports: [
     FormsModule,
+    FormRoot,
+    FormField,
     MatButtonModule,
     MatFormFieldModule,
     MatInputModule,
@@ -30,40 +33,61 @@ export class TenantForm {
   readonly cancelled = output<void>();
   readonly submitted = output<TenantSaveRequest>();
 
-  readonly firstName = signal('');
+  readonly tenantModel = signal<Tenant>({
-  readonly lastName = signal('');
+    firstName: '',
-  readonly email = signal('');
+    lastName: '',
-  readonly phone = signal('');
+    email: '',
-  readonly address = signal('');
+    phone: '',
+    address: '',
+  });
+
+  readonly tenantForm = form(this.tenantModel, (f) => {
+    required(f.firstName);
+    required(f.lastName);
+    required(f.email);
+    email(f.email);
+  });
 
   constructor() {
     effect(() => this.fillForm(this.tenant()));
   }
 
-  save(form: NgForm): void {
+  save(): void {
     if (this.saving()) return;
-    if (form.invalid) {
+    this.tenantModel.update((m) => ({
-      form.control.markAllAsTouched();
+      firstName: m.firstName.trim(),
+      lastName: m.lastName.trim(),
+      email: m.email.trim(),
+      phone: m.phone.trim(),
+      address: m.address.trim(),
+    }));
+
+    this.tenantForm().markAsTouched();
+    if (this.tenantForm().invalid()) {
       return;
     }
 
+    const modelVal = this.tenantModel();
     this.submitted.emit({
       tenant: {
-        firstName: this.firstName().trim(),
+        firstName: modelVal.firstName,
-        lastName: this.lastName().trim(),
+        lastName: modelVal.lastName,
-        email: this.email().trim(),
+        email: modelVal.email,
-        phone: this.phone().trim(),
+        phone: modelVal.phone,
-        address: this.address().trim(),
+        address: modelVal.address,
       },
       tenantId: this.tenant()?.id,
     });
   }
 
   private fillForm(tenant: Tenant | null): void {
-    this.firstName.set(tenant?.firstName ?? '');
+    this.tenantModel.set({
-    this.lastName.set(tenant?.lastName ?? '');
+      id: tenant?.id,
-    this.email.set(tenant?.email ?? '');
+      firstName: tenant?.firstName ?? '',
-    this.phone.set(tenant?.phone ?? '');
+      lastName: tenant?.lastName ?? '',
-    this.address.set(tenant?.address ?? '');
+      email: tenant?.email ?? '',
+      phone: tenant?.phone ?? '',
+      address: tenant?.address ?? '',
+    });
   }
 }