Inline Edit with Apex

import { LightningElement, wire } from 'lwc';
import getContacts from '@salesforce/apex/ContactController.getContactList';
import updateContacts from '@salesforce/apex/ContactController.updateContacts';
import { refreshApex } from '@salesforce/apex';
import { ShowToastEvent } from 'lightning/platformShowToastEvent';

const COLS = [
    { label: 'First Name', fieldName: 'FirstName', editable: true },
    { label: 'Last Name', fieldName: 'LastName', editable: true },
    { label: 'Title', fieldName: 'Title', editable: true },
    { label: 'Phone', fieldName: 'Phone', type: 'phone', editable: true },
    { label: 'Email', fieldName: 'Email', type: 'email', editable: true }
];

export default class DatatableInlineEditWithApex extends LightningElement {
    columns = COLS;
    draftValues = [];

    @wire(getContacts)
    contacts;

    async handleSave(event) {
        const updatedFields = event.detail.draftValues;

        // Clear all datatable draft values
        this.draftValues = [];

        try {
            // Pass edited fields to the updateContacts Apex controller
            await updateContacts({ contactsForUpdate: updatedFields });

            // Report success with a toast
            this.dispatchEvent(
                new ShowToastEvent({
                    title: 'Success',
                    message: 'Contacts updated',
                    variant: 'success'
                })
            );

            // Display fresh data in the datatable
            await refreshApex(this.contacts);
        } catch (error) {
            this.dispatchEvent(
                new ShowToastEvent({
                    title: 'Error while updating or refreshing records',
                    message: error.body.message,
                    variant: 'error'
                })
            );
        }
    }
}

public with sharing class ContactController {
    @AuraEnabled(cacheable=true)
    public static List<Contact> getContactList() {
        return [
            SELECT Id, Name, FirstName, LastName, Title, Phone, Email, Picture__c
            FROM Contact
            WHERE Picture__c != NULL
            WITH USER_MODE
            LIMIT 10
        ];
    }

    @AuraEnabled
    public static void updateContacts(List<Contact> contactsForUpdate) {
        // Make sure we can update the database before trying to update
        if (!Schema.sObjectType.Contact.isUpdateable()) {
            throw new SecurityException(
                'Insufficient permissions to update contacts'
            );
        }
        update contactsForUpdate;
    }
}