Call to undefined method App\User::gravatar() - database

Question

<!-- Main Sidebar Container -->
<aside class="main-sidebar sidebar-dark-primary elevation-4">
<!-- Brand Logo -->
<a href="{{ url('/home') }}" class="brand-link">
<img src="{{ asset('/backend/dist/img/AdminLTELogo.png')}}" alt="AdminLTE Logo" class="brand-image img-circle elevation-3"
style="opacity: .8">
<span class="brand-text font-weight-light">AdminLTE 3</span>
</a>
<?php $currentUser = Auth::user();?>
<!-- Sidebar -->
<div class="sidebar">
<!-- Sidebar user panel (optional) -->
<div class="user-panel mt-3 pb-3 mb-3 d-flex">
<div class="image">
<img src="{{ $currentUser->gravatar() }}" class="img-circle elevation-2" alt="{{ $currentUser->name }}">
</div>
<div class="info">
{{ $currentUser->name }}
</div>
</div>
<!-- Sidebar Menu -->
<nav class="mt-2">
<ul class="nav nav-pills nav-sidebar flex-column" data-widget="treeview" role="menu" data-accordion="false">
<!-- Add icons to the links using the .nav-icon class
with font-awesome or any other icon font library -->
<li class="nav-item has-treeview menu-open">
<a href="#" class="nav-link active">
<i class="nav-icon fa fa-dashboard"></i>
<p>
Dashboard
<i class="right fa fa-angle-left"></i>
</p>
</a>
<ul class="nav nav-treeview">
<li class="nav-item">
<a href="./index.html" class="nav-link active">
<i class="fa fa-circle-o nav-icon"></i>
<p>Dashboard v1</p>
</a>
</li>
<li class="nav-item">
<a href="./index2.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Dashboard v2</p>
</a>
</li>
<li class="nav-item">
<a href="./index3.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Dashboard v3</p>
</a>
</li>
</ul>
</li>
<li class="nav-item">
<a href="pages/widgets.html" class="nav-link">
<i class="nav-icon fa fa-th"></i>
<p>
Widgets
<span class="right badge badge-danger">New</span>
</p>
</a>
</li>
<li class="nav-item has-treeview">
<a href="#" class="nav-link">
<i class="nav-icon fa fa-pie-chart"></i>
<p>
Charts
<i class="right fa fa-angle-left"></i>
</p>
</a>
<ul class="nav nav-treeview">
<li class="nav-item">
<a href="pages/charts/chartjs.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>ChartJS</p>
</a>
</li>
<li class="nav-item">
<a href="pages/charts/flot.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Flot</p>
</a>
</li>
<li class="nav-item">
<a href="pages/charts/inline.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Inline</p>
</a>
</li>
</ul>
</li>
<li class="nav-item has-treeview">
<a href="#" class="nav-link">
<i class="nav-icon fa fa-tree"></i>
<p>
UI Elements
<i class="fa fa-angle-left right"></i>
</p>
</a>
<ul class="nav nav-treeview">
<li class="nav-item">
<a href="pages/UI/general.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>General</p>
</a>
</li>
<li class="nav-item">
<a href="pages/UI/icons.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Icons</p>
</a>
</li>
<li class="nav-item">
<a href="pages/UI/buttons.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Buttons</p>
</a>
</li>
<li class="nav-item">
<a href="pages/UI/sliders.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Sliders</p>
</a>
</li>
</ul>
</li>
<li class="nav-item has-treeview">
<a href="#" class="nav-link">
<i class="nav-icon fa fa-edit"></i>
<p>
Blog
<i class="fa fa-angle-left right"></i>
</p>
</a>
<ul class="nav nav-treeview">
<li class="nav-item">
<a href="#" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>All Posts</p>
</a>
</li>
<li class="nav-item">
<a href="#" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Add New</p>
</a>
</li>
</ul>
</li>
<li class="nav-item has-treeview">
<a href="#" class="nav-link">
<i class="nav-icon fa fa-table"></i>
<p>
Tables
<i class="fa fa-angle-left right"></i>
</p>
</a>
<ul class="nav nav-treeview">
<li class="nav-item">
<a href="pages/tables/simple.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Simple Tables</p>
</a>
</li>
<li class="nav-item">
<a href="pages/tables/data.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Data Tables</p>
</a>
</li>
</ul>
</li>
<li class="nav-header">EXAMPLES</li>
<li class="nav-item">
<a href="pages/calendar.html" class="nav-link">
<i class="nav-icon fa fa-calendar"></i>
<p>
Calendar
<span class="badge badge-info right">2</span>
</p>
</a>
</li>
<li class="nav-item has-treeview">
<a href="#" class="nav-link">
<i class="nav-icon fa fa-envelope-o"></i>
<p>
Mailbox
<i class="fa fa-angle-left right"></i>
</p>
</a>
<ul class="nav nav-treeview">
<li class="nav-item">
<a href="pages/mailbox/mailbox.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Inbox</p>
</a>
</li>
<li class="nav-item">
<a href="pages/mailbox/compose.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Compose</p>
</a>
</li>
<li class="nav-item">
<a href="pages/mailbox/read-mail.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Read</p>
</a>
</li>
</ul>
</li>
<li class="nav-item has-treeview">
<a href="#" class="nav-link">
<i class="nav-icon fa fa-book"></i>
<p>
Pages
<i class="fa fa-angle-left right"></i>
</p>
</a>
<ul class="nav nav-treeview">
<li class="nav-item">
<a href="pages/examples/invoice.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Invoice</p>
</a>
</li>
<li class="nav-item">
<a href="pages/examples/profile.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Profile</p>
</a>
</li>
<li class="nav-item">
<a href="pages/examples/login.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Login</p>
</a>
</li>
<li class="nav-item">
<a href="pages/examples/register.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Register</p>
</a>
</li>
<li class="nav-item">
<a href="pages/examples/lockscreen.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Lockscreen</p>
</a>
</li>
</ul>
</li>
<li class="nav-item has-treeview">
<a href="#" class="nav-link">
<i class="nav-icon fa fa-plus-square-o"></i>
<p>
Extras
<i class="fa fa-angle-left right"></i>
</p>
</a>
<ul class="nav nav-treeview">
<li class="nav-item">
<a href="pages/examples/404.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Error 404</p>
</a>
</li>
<li class="nav-item">
<a href="pages/examples/500.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Error 500</p>
</a>
</li>
<li class="nav-item">
<a href="pages/examples/blank.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Blank Page</p>
</a>
</li>
<li class="nav-item">
<a href="starter.html" class="nav-link">
<i class="fa fa-circle-o nav-icon"></i>
<p>Starter Page</p>
</a>
</li>
</ul>
</li>
<li class="nav-header">MISCELLANEOUS</li>
<li class="nav-item">
<a href="https://adminlte.io/docs" class="nav-link">
<i class="nav-icon fa fa-file"></i>
<p>Documentation</p>
</a>
</li>
<li class="nav-header">LABELS</li>
<li class="nav-item">
<a href="#" class="nav-link">
<i class="nav-icon fa fa-circle-o text-danger"></i>
<p class="text">Important</p>
</a>
</li>
<li class="nav-item">
<a href="#" class="nav-link">
<i class="nav-icon fa fa-circle-o text-warning"></i>
<p>Warning</p>
</a>
</li>
<li class="nav-item">
<a href="#" class="nav-link">
<i class="nav-icon fa fa-circle-o text-info"></i>
<p>Informational</p>
</a>
</li>
</ul>
</nav>
<!-- /.sidebar-menu -->
</div>
<!-- /.sidebar -->
</aside>
ErrorException (E_ERROR)
Call to undefined method App\User::gravatar() (View: D:\xampp\htdocs\asset_manage\resources\views\layouts\backend\sidebar.blade.php) (View: D:\xampp\htdocs\asset_manage\resources\views\layouts\backend\sidebar.blade.php) (View: D:\xampp\htdocs\asset_manage\resources\views\layouts\backend\sidebar.blade.php)
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Answer 1

Can you set the Gravatar value in the view parameter in your controller?
return view('YOUR_BLADE', ['gravatar' => $currentUser->gravatar()]);

Answer 2

If you have a column in users table named 'gravatar' then you can simply use in this way to get gravatar data of current user.
{{ Auth::user()->gravatar }}