feat: isolate apartment portfolios by landlord (#25)

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

@@ -7,6 +7,9 @@ import { MatInputModule } from '@angular/material/input';
 import { MatProgressSpinnerModule } from '@angular/material/progress-spinner';
 import { Apartment } from '../../services/apartment.service';
 
+const requiredFieldsError =
+  'Veuillez remplir tous les champs obligatoires (Nom, Adresse, Prix > 0).';
+
 @Component({
   selector: 'app-apartment-form',
   imports: [
@@ -36,10 +39,10 @@ export class ApartmentForm {
   });
 
   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).' });
+    required(f.name, { message: requiredFieldsError });
+    required(f.address, { message: requiredFieldsError });
+    required(f.purchasePrice, { message: requiredFieldsError });
+    min(f.purchasePrice, 1, { message: requiredFieldsError });
   });
 
   readonly error = signal('');
@@ -51,9 +54,13 @@ export class ApartmentForm {
   save(): void {
     if (this.saving()) return;
     this.apartmentForm().markAsTouched();
-    if (this.apartmentForm().invalid()) {
+    if (
+      this.apartmentForm().invalid() ||
+      !this.apartmentModel().name.trim() ||
+      !this.apartmentModel().address.trim()
+    ) {
       const firstError = this.apartmentForm().errorSummary()[0];
-      this.error.set(firstError?.message ?? 'Veuillez corriger les erreurs.');
+      this.error.set(firstError?.message ?? requiredFieldsError);
       return;
     }