feature(autocomplete): Add optionValue input

fixes primefaces#14599

src/app/components/autocomplete/autocomplete.ts

@@ -558,6 +558,11 @@ export class AutoComplete implements AfterViewChecked, AfterContentInit, OnDestr
      * @group Props
      */
     @Input() optionLabel: string | ((item: any) => string) | undefined;
+    /**
+     * Property name or getter function to use as the value of an option.
+     * @group Props
+     */
+    @Input() optionValue: string | ((item: any) => string) | undefined;
     /**
      * Unique identifier of the component.
      * @group Props
@@ -768,9 +773,13 @@ export class AutoComplete implements AfterViewChecked, AfterContentInit, OnDestr
 
     inputValue = computed(() => {
         const modelValue = this.modelValue();
+        const selectedOption = this.optionValueSelected
+            ? (this.suggestions || []).find((item: any) => ObjectUtils.resolveFieldData(item, this.optionValue) === modelValue)
+            : modelValue;
+
         if (modelValue) {
-            if (typeof modelValue === 'object') {
-                const label = this.getOptionLabel(modelValue);
+            if (typeof modelValue === 'object' || this.optionValueSelected) {
+                const label = this.getOptionLabel(selectedOption);
 
                 return label != null ? label : modelValue;
             } else {
@@ -856,6 +865,10 @@ export class AutoComplete implements AfterViewChecked, AfterContentInit, OnDestr
         return !this.virtualScroll;
     }
 
+    get optionValueSelected() {
+        return typeof this.modelValue() === 'string' && this.optionValue;
+    }
+
     constructor(@Inject(DOCUMENT) private document: Document, public el: ElementRef, public renderer: Renderer2, public cd: ChangeDetectorRef, public config: PrimeNGConfig, public overlayService: OverlayService, private zone: NgZone) {
         effect(() => {
             this.filled = ObjectUtils.isNotEmpty(this.modelValue());
@@ -1564,7 +1577,7 @@ export class AutoComplete implements AfterViewChecked, AfterContentInit, OnDestr
     }
 
     getOptionValue(option) {
-        return option; // TODO: The 'optionValue' properties can be added.
+        return this.optionValue ? ObjectUtils.resolveFieldData(option, this.optionValue) : option && option.value != undefined ? option.value : option;
     }
 
     getOptionIndex(index, scrollerOptions) {