diff --git a/src/lib/form/base-form.component.ts b/src/lib/form/base-form.component.ts
index 4ae779e..c93d71a 100644
--- a/src/lib/form/base-form.component.ts
+++ b/src/lib/form/base-form.component.ts
@@ -1,14 +1,24 @@
 import { Directive } from '@angular/core';
 import { FormGroup } from '@angular/forms';
-import { hasFormChanged } from '@iqser/common-ui';
+import { AutoUnsubscribe, hasFormChanged } from '@iqser/common-ui';
 
 @Directive()
-export class BaseFormComponent {
+export abstract class BaseFormComponent extends AutoUnsubscribe {
 
     form!: FormGroup;
     initialFormValue;
 
-    get changed() {
+    constructor() {
+        super();
+    }
+
+    get changed(): boolean {
         return hasFormChanged(this.form, this.initialFormValue);
     }
+
+    get valid(): boolean {
+        return this.form?.valid;
+    }
+
+    abstract save(): Promise<void>;
 }
diff --git a/src/lib/utils/functions.ts b/src/lib/utils/functions.ts
index 133feb4..b9e38ec 100644
--- a/src/lib/utils/functions.ts
+++ b/src/lib/utils/functions.ts
@@ -38,30 +38,32 @@ export function trackBy<T extends ITrackable>() {
 
 export function hasFormChanged(form: FormGroup, initialFormValue): boolean {
 
-    for (const key of Object.keys(form.getRawValue())) {
-        const initialValue = initialFormValue[key];
-        const updatedValue = form.get(key).value;
+    if (form && initialFormValue) {
+        for (const key of Object.keys(form.getRawValue())) {
+            const initialValue = initialFormValue[key];
+            const updatedValue = form.get(key).value;
 
-        if (initialValue == null && updatedValue != null) {
-            const updatedValueType = typeof updatedValue;
-            if (updatedValueType !== 'string' && updatedValueType !== 'boolean') {
-                return true;
-            } else if (updatedValueType === 'string' && updatedValue.length > 0) {
-                return true;
-            } else if (updatedValueType === 'boolean' && updatedValue === true) {
-                return true;
-            }
-        } else if (initialValue !== updatedValue) {
-            if (Array.isArray(updatedValue)) {
-                if (JSON.stringify(initialValue) !== JSON.stringify(updatedValue)) {
+            if (initialValue == null && updatedValue != null) {
+                const updatedValueType = typeof updatedValue;
+                if (updatedValueType !== 'string' && updatedValueType !== 'boolean') {
+                    return true;
+                } else if (updatedValueType === 'string' && updatedValue.length > 0) {
+                    return true;
+                } else if (updatedValueType === 'boolean' && updatedValue === true) {
                     return true;
                 }
-            } else if (updatedValue instanceof moment) {
-                if (!moment(updatedValue).isSame(moment(initialValue))) {
+            } else if (initialValue !== updatedValue) {
+                if (Array.isArray(updatedValue)) {
+                    if (JSON.stringify(initialValue) !== JSON.stringify(updatedValue)) {
+                        return true;
+                    }
+                } else if (updatedValue instanceof moment) {
+                    if (!moment(updatedValue).isSame(moment(initialValue))) {
+                        return true;
+                    }
+                } else {
                     return true;
                 }
-            } else {
-                return true;
             }
         }
     }