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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace App\DataTables;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use App\Models\AdminUser;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use App\Support\Datatables\Services\DataTable;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Illuminate\Support\Facades\Auth;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                class AdminUserDataTable extends DataTable  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * Build DataTable class.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return \Yajra\Datatables\Engines\BaseEngine  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function dataTable()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->datatables  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->eloquent($this->query())  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->editColumn('avatar', function ($user) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                return $this->getAvatarColumnData($user);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            })  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->editColumn('action', function ($user) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                return $this->getActionColumnData($user);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            })  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->rawColumns(['avatar', 'action']);  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * Get the query object to be processed by dataTables.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return \Illuminate\Database\Eloquent\Builder|\Illuminate\Database\Query\Builder|\Illuminate\Support\Collection  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function query()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $query = AdminUser::query();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->applyScopes($query);  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * Optional method if you want to use html builder.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return \Yajra\Datatables\Html\Builder  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function html()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->builder()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->columns($this->getColumns())  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->addAction()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->parameters($this->getBuilderParameters());  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * Get columns.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return array  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function getColumns()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'id' => ['title' => 'ID'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'avatar' => $this->staticColumn('avatar', ['title' => '头像']), | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'username' => ['title' => '用户名'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'email' => ['title' => '邮箱'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'created_at' => ['title' => '创建日期'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ];  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * Get the "avatar" column data.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param  AdminUser  $user  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return mixed  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function getAvatarColumnData($user)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return <<<HTML  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                <a href='{$user->avatar}' data-lightbox='admin-user-avatar-{$user->id}'> | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    <img src='{$user->avatar}' class='img-circle' style='width:28px;height:28px'> | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                </a>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                HTML;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * Get the "action" column data.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param  AdminUser  $user  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return mixed  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function getActionColumnData($user)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $html = '<div class="btn-group" role="group">';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (Auth::user()->can('update', $user)) { | 
            
                            
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                            $html .= '<button type="button" class="btn btn-info admin-user-action-edit"><i class="fa fa-edit"></i></button>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (Auth::user()->can('delete', $user)) { | 
            
                            
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                            $html .= '<button type="button" class="btn btn-danger admin-user-action-delete"><i class="fa fa-trash"></i></button>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $html .= '</div>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $html;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * Get the default builder parameters.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return array  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function getBuilderParameters()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'order' => [[0, 'asc']],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ];  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: