some validation and error catching updates

app/Exports/AttendanceGroupedExportSingleView.php

@@ -34,8 +34,8 @@ class AttendanceGroupedExportSingleView implements FromView, WithTitle
     {
         if($this->groupBy == 'classes_id') {
 
-            $subject = Subject::find(Classes::find($this->groupedValue)->subject_id)->name;
+            $subject = Subject::findOrFail(Classes::find($this->groupedValue)->subject_id)->name;
-            $date = Classes::find($this->groupedValue)->date;
+            $date = Classes::findOrFail($this->groupedValue)->date;
 
             $this->groupedValue = "{$date} {$subject}";
         } else if($this->groupBy == 'seat_number') {

app/Exports/AttendanceGroupedExportView.php

@@ -28,6 +28,9 @@ class AttendanceGroupedExportView implements WithMultipleSheets
     public function sheets(): array
     {
         $user_id = Auth::id();
+        if(!$user_id) {
+            abort(401);
+        }
         $subjects = Subject::where('user_id', $user_id)->get();
         $subjects_ids = $subjects->pluck('id')->toArray();
         $classes = Classes::whereIn('subject_id', $subjects_ids)->orderBy('created_at','DESC')->get();

app/Http/Controllers/User/UserAttendancesController.php

@@ -3,6 +3,7 @@
 namespace App\Http\Controllers\User;
 
 use App\Http\Controllers\Controller;
+use Illuminate\Database\Eloquent\ModelNotFoundException;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Auth;
 use App\Exports\AttendanceExportView;
@@ -40,6 +41,9 @@ class UserAttendancesController extends Controller
     public function index($groupBy='classes_id')
     {
         $user_id = Auth::id();
+        if(!$user_id) {
+            abort(401);
+        }
         $subjects = Subject::where('user_id', $user_id)->get();
         $subjects_ids = $subjects->pluck('id')->toArray();
         $classes = Classes::whereIn('subject_id', $subjects_ids)->orderBy('created_at','DESC')->get();
@@ -83,20 +87,29 @@ class UserAttendancesController extends Controller
 
     public function delete_attendance($attendance_id)
     {
-        Attendance::find($attendance_id)->delete();
+        try {
-        return redirect()->back();
+            Attendance::findOrFail($attendance_id)->delete();
+            return redirect()->back();
+        } catch(ModelNotFoundException $exception) {
+            return redirect()->back()->withErrors(['Taki wpis obecności nie istnieje w bazie danych, zatem nie można go usunąć.']);
+        }
     }
 
     public function edit_attendance($attendance_id)
     {
-        Attendance::find($attendance_id);
+        Attendance::findOrFail($attendance_id);
         return redirect()->back();
     }
 
     public function export($classes_id)
     {
-        $classes_date = Classes::find($classes_id)->date;
+        try {
-        return Excel::download(new AttendanceExportView($classes_id), "classes-attendance-{$classes_date}.xlsx");
+            $classes_date = Classes::findOrFail($classes_id)->date;
+            return Excel::download(new AttendanceExportView($classes_id), "classes-attendance-{$classes_date}.xlsx");
+        } catch(ModelNotFoundException $exception) {
+            return redirect()->back()->withErrors(['Takie zajęcia nie istnieją w bazie danych, zatem nie można wyeksportować obecności.']);
+        }
+
     }
 
     public function export_grouped($groupBy)
@@ -106,18 +119,24 @@ class UserAttendancesController extends Controller
         if($groupBy == 'classes_id') {
             $groupByLabel = 'classes-name';
         }
-        return Excel::download(new AttendanceGroupedExportView($groupBy), "all-attendance-grouped-by-{$groupByLabel}-{$today_date}.xlsx");
+        if($today_date & $groupByLabel){
+            return Excel::download(new AttendanceGroupedExportView($groupBy), "all-attendance-grouped-by-{$groupByLabel}-{$today_date}.xlsx");
+        };
+        return redirect()->back();
     }
 
     public function add_attendance_note(Request $request)
     {
         $attendance_id = $request->input('attendance_id');
         $note = $request->input('note_content');
-        $attendance = Attendance::find($attendance_id);
+        try {
-        $attendance->notes = $note;
+            $attendance = Attendance::findOrFail($attendance_id);
-        $attendance->save();
+            $attendance->notes = $note;
-        $attendance->refresh();
+            $attendance->save();
-        return redirect()->back();
+            $attendance->refresh();
+            return redirect()->back();
+        } catch(ModelNotFoundException $exception) {
+            return redirect()->back()->withErrors(['Taki wpis obecności nie istnieje w bazie danych, zatem nie można dodaź do niego notatki.']);
+        }
     }
-
 }

app/Http/Controllers/User/UserClassesController.php

@@ -5,6 +5,7 @@ namespace App\Http\Controllers\User;
 use App\Attendance;
 use App\Http\Controllers\Controller;
 use App\Http\Controllers\UserCache;
+use Illuminate\Database\Eloquent\ModelNotFoundException;
 use Illuminate\Http\Request;
 
 use App\Subject;
@@ -54,6 +55,9 @@ class UserClassesController extends Controller {
 
     public function index($groupBy = 'subject_id') {
         $user_id = Auth::id();
+        if(!$user_id) {
+            abort(401);
+        }
         $subjects = Subject::where('user_id', $user_id)->get();
         $subjects_ids = $subjects->pluck('id')->toArray();
         $classes = Classes::whereIn('subject_id', $subjects_ids)->orderBy('created_at', 'DESC')->get();
@@ -91,26 +95,33 @@ class UserClassesController extends Controller {
     }
 
     public function delete_classes($classes_id) {
-        Classes::find($classes_id)->delete();
+        try {
-        return redirect()->back();
+            Classes::findOrFail($classes_id)->delete();
+            return redirect()->back();
+        } catch(ModelNotFoundException $exception) {
+            return redirect()->back()->withErrors(['Takie zajęcia nie istniejeą w bazie danych, zatem nie można ich usunąć.']);
+        }
     }
 
     public function edit_classes($classes_id) {
-        Classes::find($classes_id);
+        Classes::findOrFail($classes_id);
         return redirect()->back();
     }
 
     public function start_classes($classes_id) {
-        $classes = Classes::find($classes_id);
+        try {
-        $classes_code = $classes->classes_code;
+            $classes = Classes::findOrFail($classes_id);
-        if (!$classes_code) {
+            $classes_code = $classes->classes_code;
-            $classes_code = generateRandomString(10);
+            if (!$classes_code) {
-            $classes->classes_code = $classes_code;
+                $classes_code = generateRandomString(10);
-            $classes->save();
+                $classes->classes_code = $classes_code;
-            $classes->refresh();
+                $classes->save();
+                $classes->refresh();
+            }
+            return view('map.start_map', ['classes_code' => $classes_code, 'classes' => $classes]);
+        } catch(ModelNotFoundException $exception) {
+            return redirect()->back()->withErrors(['Takie zajęcia nie istnieją w bazie danych, zatem nie można ich rozpocząć.']);
         }
-
-        return view('map.start_map', ['classes_code' => $classes_code, 'classes' => $classes]);
     }
 
     public function start_classes_verified(Request $request) {
@@ -123,9 +134,21 @@ class UserClassesController extends Controller {
         $student_id_number = $request->input('student_id_number');
         $student_name = $request->input('student_name');
         $student_surname = $request->input('student_surname');
-        $classes = Classes::find($request->get('classes_id'));
+        try {
-        $subject = Subject::find($classes->subject_id);
+            $classes = Classes::findOrFail($request->get('classes_id'));
-        $room_capacity = Room::find($subject->room_id)->capacity;
+        } catch(ModelNotFoundException $exception) {
+            return redirect()->back()->withErrors(['Takie zajęcia nie istnieją w bazie danych, zatem nie można ich rozpocząć.']);
+        }
+        try {
+            $subject = Subject::findOrFail($classes->subject_id);
+        } catch(ModelNotFoundException $exception) {
+            return redirect()->back()->withErrors(['Taki przedmiot nie istnieje w bazie danych.']);
+        }
+        try {
+            $room_capacity = Room::findOrFail($subject->room_id)->capacity;
+        } catch(ModelNotFoundException $exception) {
+            return redirect()->back()->withErrors(['Taka sala nie istnieje w bazie danych.']);
+        }
         $attendances = Attendance::where('classes_id', $classes->id)->get();
         $student_ids = $attendances->pluck('student_id_number')->toArray();
         $seat_numbers = $attendances->pluck('seat_number')->toArray();
@@ -157,7 +180,11 @@ class UserClassesController extends Controller {
                     return view('map.summary_map', ['student_name' => $student_name, 'student_surname' => $student_surname, 'seat_number' => null, 'student_id_number' => $student_id_number, 'classes_id' => $classes->id, 'mode' => $classes->mode, 'warning' => null]);
                 } else {
                     // prepare seat map
-                    $room_arrangement = Room::find($subject->room_id)->arrangement;
+                    try {
+                        $room_arrangement = Room::findOrFail($subject->room_id)->arrangement;
+                    } catch(ModelNotFoundException $exception) {
+                        return redirect()->back()->withErrors(['Taka sala nie istnieje w bazie danych.']);
+                    }
                     if (!$room_arrangement) {
                         $room_arrangement = Room::where('name', 'Inna sala')->first()->arrangement;
                     }
@@ -182,6 +209,7 @@ class UserClassesController extends Controller {
                 }
             }
         }
+
     }
 
     public function save_classes_data(Request $request) {
@@ -190,7 +218,11 @@ class UserClassesController extends Controller {
         $student_name = $request->input('student_name');
         $student_surname = $request->input('student_surname');
         $seat_number = $request->input('seat_number');
-        $classes = Classes::find($request->get('classes_id'));
+        try {
+            $classes = Classes::findOrFail($request->get('classes_id'));
+        } catch(ModelNotFoundException $exception) {
+            return redirect()->back()->withErrors(['Takie zajęcia nie istnieją w bazie danych.']);
+        }
         $attendances = Attendance::where('classes_id', $classes->id)->get();
         $student_ids = $attendances->pluck('student_id_number')->toArray();
 
@@ -212,11 +244,23 @@ class UserClassesController extends Controller {
 
     public function preview_classes($classes_id, $orderBy = 'student_surname', $orderDirection = 'ASC') {
         if (!$classes_id == 0) {
-            $classes = Classes::find($classes_id);
+            try {
+                $classes = Classes::findOrFail($classes_id);
+            } catch(ModelNotFoundException $exception) {
+                return redirect()->back()->withErrors(['Takie zajęcia nie istnieją w bazie danych.']);
+            }
             $attendances = Attendance::where('classes_id', $classes->id)->orderBy($orderBy, $orderDirection)->get();
             $seat_numbers = $attendances->pluck('seat_number')->toArray();
-            $subject = Subject::find($classes->subject_id);
+            try {
-            $room_arrangement = Room::find($subject->room_id)->arrangement;
+                $subject = Subject::findOrFail($classes->subject_id);
+            } catch(ModelNotFoundException $exception) {
+                return redirect()->back()->withErrors(['Taki przedmiot nie istnieje w bazie danych.']);
+            }
+            try {
+                $room_arrangement = Room::findOrFail($subject->room_id)->arrangement;
+            } catch(ModelNotFoundException $exception) {
+                return redirect()->back()->withErrors(['Taka sala nie istnieje w bazie danych.']);
+            }
             if (!$room_arrangement) {
                 $room_arrangement = Room::where('name', 'Inna sala')->first()->arrangement;
             }
@@ -228,7 +272,7 @@ class UserClassesController extends Controller {
                 $multi_parts = false;
             }
             return view('user.user_preview_classes', ['classes_id' => $classes_id, 'room_arrangement' => $room_arrangement, 'attendances' => $attendances, 'seat_numbers' => $seat_numbers, 'orderBy' => $orderBy, 'orderDirection' => $orderDirection, 'multi_parts' => $multi_parts, 'parts_number' => $parts_number]);
-
         }
+        return redirect()->back();
     }
 }

app/Http/Controllers/User/UserSubjectsController.php

@@ -3,6 +3,7 @@
 namespace App\Http\Controllers\User;
 
 use App\Http\Controllers\Controller;
+use Illuminate\Database\Eloquent\ModelNotFoundException;
 use Illuminate\Support\Facades\Validator;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Auth;
@@ -56,6 +57,9 @@ class UserSubjectsController extends Controller
 
     public function index($groupBy = 'weekday') {
         $user_id = Auth::id();
+        if(!$user_id) {
+            abort(401);
+        }
         $subjects = Subject::where('user_id', $user_id)->orderBy('name','ASC')->get();
         $subjects_grouped = $subjects->groupBy($groupBy);
         $rooms = Room::all();
@@ -94,16 +98,20 @@ class UserSubjectsController extends Controller
 
     public function delete_subject($subject_id)
     {
-        Subject::find($subject_id)->delete();
+        try {
-        return redirect()->back();
+            Subject::findOrFail($subject_id)->delete();
+            return redirect()->back();
+        } catch(ModelNotFoundException $exception) {
+            return redirect()->back()->withErrors(['Taki przedmiot nie istnieje w bazie danych, zatem nie można go usunąć.']);
+        }
     }
 
     public function edit_subject(Request $request)
     {
         $subject_id = $request->input('subject_id');
-        $subject = Subject::find($subject_id);
+        try {
-        if($subject) {
+            $subject = Subject::findOrFail($subject_id);
-            if($request->input('name_e') == $subject->name) {
+            if ($request->input('name_e') == $subject->name) {
                 $validator = $this->edited_validator($request->except(['name_e']));
             } else {
                 $validator = $this->edited_validator($request->all());
@@ -120,7 +128,10 @@ class UserSubjectsController extends Controller
             $subject->room_id = $request->input('room_id_e');
             $subject->save();
             $subject->refresh();
+            return redirect()->back();
+        } catch(ModelNotFoundException $exception) {
+            return redirect()->back()->withErrors(['Taki przedmiot nie istnieje w bazie danych, zatem nie można go edytować.']);
         }
-        return redirect()->back();
+
-    }
+}
 }

database/seeds/RoomsTableSeeder.php

@@ -53,17 +53,17 @@ class RoomsTableSeeder extends Seeder
             ),
             array('name' => 'A2-2', 'capacity' => 34, 'arrangement' => 'c[1,1]c[2,2]c[3,3]c[4,4]c[5,5]c[6,6]++_++c[7,7]c[8,8]c[9,9]c[10,10]c[11,11]c[12,12]++c[13,13]c[14,14]c[15,15]c[16,16]c[17,17]c[18,18]++c[19,19]c[20,20]c[21,21]c[22,22]c[23,23]c[24,24]++_++c[25,25]c[26,26]c[27,27]c[28,28]c[29,29]c[30,30]++c[31,31]c[32,32]c[33,33]c[34,34]', 'description' => ''),
             array('name' => 'A2-20', 'capacity' => 32, 'arrangement' => 'c[1,1]c[2,2]c[3,3]c[4,4]c[5,5]c[6,6]++_++c[7,7]c[8,8]c[9,9]c[10,10]c[11,11]c[12,12]++c[13,13]c[14,14]c[15,15]c[16,16]c[17,17]c[18,18]++c[19,19]c[20,20]c[21,21]c[22,22]c[23,23]c[24,24]++_++c[25,25]c[26,26]c[27,27]c[28,28]c[29,29]c[30,30]++c[31,31]c[32,32]', 'description' => ''),
-            array('name' => 'A2-21', 'capacity' => 48, 'arrangement' => 'c[1,1]c[2,2]c[3,3]c[4,4]_c[5,5]c[6,6]c[7,7]c[8,8]++c[9,9]c[10,10]c[11,11]c[12,12]_c[13,13]c[14,14]c[15,15]c[16,16]++c[17,17]c[18,18]c[19,19]c[20,20]_c[21,21]c[22,22]c[23,23]c[24,24]++c[25,25]c[26,26]c[27,27]c[28,28]_c[29,29]c[30,30]c[31,31]c[32,32]++c[33,33]c[34,34]c[35,35]c[36,36]_c[37,37]c[38,38]c[39,39]c[40,40]++c[41,41]c[42,42]c[43,43]c[44,44]_c[45,45]c[46,46]c[47,47]c[48,48]',
+            array('name' => 'A2-21', 'capacity' => 48, 'arrangement' => '_____c[1,1]c[2,2]c[3,3]c[4,4]++_____c[5,5]c[6,6]c[7,7]c[8,8]++c[9,9]c[10,10]c[11,11]c[12,12]_c[13,13]c[14,14]c[15,15]c[16,16]++c[17,17]c[18,18]c[19,19]c[20,20]_c[21,21]c[22,22]c[23,23]c[24,24]++c[25,25]c[26,26]c[27,27]c[28,28]_c[29,29]c[30,30]c[31,31]c[32,32]++c[33,33]c[34,34]c[35,35]c[36,36]_c[37,37]c[38,38]c[39,39]c[40,40]++c[41,41]c[42,42]c[43,43]c[44,44]_c[45,45]c[46,46]c[47,47]c[48,48]',
-                'description' => 'Perspektywa z poziomu komputera prowadzącego - numery 1-8 to rząd pod ścianą.'
+                'description' => 'Perspektywa z poziomu komputera prowadzącego - numery 1-4 to rząd pod ścianą.'
                 ),
-            array('name' => 'A2-22', 'capacity' => 48, 'arrangement' => 'c[1,1]c[2,2]c[3,3]c[4,4]_c[5,5]c[6,6]c[7,7]c[8,8]++c[9,9]c[10,10]c[11,11]c[12,12]_c[13,13]c[14,14]c[15,15]c[16,16]++c[17,17]c[18,18]c[19,19]c[20,20]_c[21,21]c[22,22]c[23,23]c[24,24]++c[25,25]c[26,26]c[27,27]c[28,28]_c[29,29]c[30,30]c[31,31]c[32,32]++c[33,33]c[34,34]c[35,35]c[36,36]_c[37,37]c[38,38]c[39,39]c[40,40]++c[41,41]c[42,42]c[43,43]c[44,44]_c[45,45]c[46,46]c[47,47]c[48,48]',
+            array('name' => 'A2-22', 'capacity' => 48, 'arrangement' => '_____c[1,1]c[2,2]c[3,3]c[4,4]++_____c[5,5]c[6,6]c[7,7]c[8,8]++c[9,9]c[10,10]c[11,11]c[12,12]_c[13,13]c[14,14]c[15,15]c[16,16]++c[17,17]c[18,18]c[19,19]c[20,20]_c[21,21]c[22,22]c[23,23]c[24,24]++c[25,25]c[26,26]c[27,27]c[28,28]_c[29,29]c[30,30]c[31,31]c[32,32]++c[33,33]c[34,34]c[35,35]c[36,36]_c[37,37]c[38,38]c[39,39]c[40,40]++c[41,41]c[42,42]c[43,43]c[44,44]_c[45,45]c[46,46]c[47,47]c[48,48]',
-                'description' => 'Perspektywa z poziomu komputera prowadzącego - numery 1-8 to rząd pod ścianą.'
+                'description' => 'Perspektywa z poziomu komputera prowadzącego - numery 1-4 to rząd pod ścianą.'
                 ),
-            array('name' => 'A2-23', 'capacity' => 48, 'arrangement' => 'c[1,1]c[2,2]c[3,3]c[4,4]_c[5,5]c[6,6]c[7,7]c[8,8]++c[9,9]c[10,10]c[11,11]c[12,12]_c[13,13]c[14,14]c[15,15]c[16,16]++c[17,17]c[18,18]c[19,19]c[20,20]_c[21,21]c[22,22]c[23,23]c[24,24]++c[25,25]c[26,26]c[27,27]c[28,28]_c[29,29]c[30,30]c[31,31]c[32,32]++c[33,33]c[34,34]c[35,35]c[36,36]_c[37,37]c[38,38]c[39,39]c[40,40]++c[41,41]c[42,42]c[43,43]c[44,44]_c[45,45]c[46,46]c[47,47]c[48,48]',
+            array('name' => 'A2-23', 'capacity' => 48, 'arrangement' => '_____c[1,1]c[2,2]c[3,3]c[4,4]++_____c[5,5]c[6,6]c[7,7]c[8,8]++c[9,9]c[10,10]c[11,11]c[12,12]_c[13,13]c[14,14]c[15,15]c[16,16]++c[17,17]c[18,18]c[19,19]c[20,20]_c[21,21]c[22,22]c[23,23]c[24,24]++c[25,25]c[26,26]c[27,27]c[28,28]_c[29,29]c[30,30]c[31,31]c[32,32]++c[33,33]c[34,34]c[35,35]c[36,36]_c[37,37]c[38,38]c[39,39]c[40,40]++c[41,41]c[42,42]c[43,43]c[44,44]_c[45,45]c[46,46]c[47,47]c[48,48]',
-                'description' => 'Perspektywa z poziomu komputera prowadzącego - numery 1-8 to rząd pod ścianą.'
+                'description' => 'Perspektywa z poziomu komputera prowadzącego - numery 1-4 to rząd pod ścianą.'
                 ),
-            array('name' => 'A2-24', 'capacity' => 48, 'arrangement' => 'c[1,1]c[2,2]c[3,3]c[4,4]_c[5,5]c[6,6]c[7,7]c[8,8]++c[9,9]c[10,10]c[11,11]c[12,12]_c[13,13]c[14,14]c[15,15]c[16,16]++c[17,17]c[18,18]c[19,19]c[20,20]_c[21,21]c[22,22]c[23,23]c[24,24]++c[25,25]c[26,26]c[27,27]c[28,28]_c[29,29]c[30,30]c[31,31]c[32,32]++c[33,33]c[34,34]c[35,35]c[36,36]_c[37,37]c[38,38]c[39,39]c[40,40]++c[41,41]c[42,42]c[43,43]c[44,44]_c[45,45]c[46,46]c[47,47]c[48,48]',
+            array('name' => 'A2-24', 'capacity' => 48, 'arrangement' => '_____c[1,1]c[2,2]c[3,3]c[4,4]++_____c[5,5]c[6,6]c[7,7]c[8,8]++c[9,9]c[10,10]c[11,11]c[12,12]_c[13,13]c[14,14]c[15,15]c[16,16]++c[17,17]c[18,18]c[19,19]c[20,20]_c[21,21]c[22,22]c[23,23]c[24,24]++c[25,25]c[26,26]c[27,27]c[28,28]_c[29,29]c[30,30]c[31,31]c[32,32]++c[33,33]c[34,34]c[35,35]c[36,36]_c[37,37]c[38,38]c[39,39]c[40,40]++c[41,41]c[42,42]c[43,43]c[44,44]_c[45,45]c[46,46]c[47,47]c[48,48]',
-                'description' => 'Perspektywa z poziomu komputera prowadzącego - numery 1-8 to rząd pod ścianą.'
+                'description' => 'Perspektywa z poziomu komputera prowadzącego - numery 1-4 to rząd pod ścianą.'
                 ),
             array('name' => 'A2-4', 'capacity' => 24, 'arrangement' => 'c[1,1]c[2,2]c[3,3]c[4,4]c[5,5]c[6,6]++_++c[7,7]c[8,8]c[9,9]c[10,10]c[11,11]c[12,12]++c[13,13]c[14,14]c[15,15]c[16,16]c[17,17]c[18,18]++c[19,19]c[20,20]c[21,21]c[22,22]c[23,23]++c[24,24]', 'description' => ''),
             array('name' => 'A2-5', 'capacity' => 24, 'arrangement' => 'c[1,1]c[2,2]c[3,3]c[4,4]c[5,5]c[6,6]++_++c[7,7]c[8,8]c[9,9]c[10,10]c[11,11]c[12,12]++c[13,13]c[14,14]c[15,15]c[16,16]c[17,17]c[18,18]++c[19,19]c[20,20]c[21,21]c[22,22]c[23,23]++c[24,24]', 'description' => ''),

resources/views/user/attendance_note.blade.php

@@ -11,7 +11,7 @@
                 <form method="POST" action="{{ route('user_add_attendance_note') }}">
                     @csrf
 
-                    <input type="hidden" class="form-control" name="attendance_id" value="{{ $attendance->id }}">
+                    <input type="hidden" class="form-control" name="attendance_id" value="{{ $attendance->id }}" required>
                     <input type="hidden" id="note_content_hidden-{{ $attendance->id }}" name="note_content_hidden" value="{{ $attendance->notes }}">
                     <div class="form-group">
                         <label for="note_content-{{ $attendance->id }}" class="col-form-label">Treść notatki:</label>

resources/views/user/user_attendances.blade.php

@@ -8,7 +8,9 @@
             <div class="card-header custom-header">
                 <h4> Wszystkie obecności <span class="badge badge-secondary" title="Liczba wszystkich obecności"> {{ $attendances->count() }} </span> </h4>
                 <div>
-                    <a href="{{ route('user_export_grouped', [$grouped_by]) }}" class="btn btn-success btn-export" title="Wyeksportuj wszystko do xlsx"> <i class="fa fa-file-excel-o"></i> Wyeksportuj (.xlsx) </a>
+                    @if ($attendances->count() > 0)
+                        <a href="{{ route('user_export_grouped', [$grouped_by]) }}" class="btn btn-success btn-export" title="Wyeksportuj wszystko do xlsx"> <i class="fa fa-file-excel-o"></i> Wyeksportuj (.xlsx) </a>
+                    @endif
                     <button type="button" class="btn btn-primary add-attendance-btn" title="Dodaj nowy wpis"> <i class="fa fa-plus"></i> Dodaj nowy wpis </button>
                 </div>
             </div>

resources/views/user/user_preview_classes.blade.php

@@ -35,8 +35,19 @@
         <div class="preview-attendance-table">
             <div class="card-header custom-header">
                 <h4> Lista obecności <span class="badge badge-secondary" title="Liczba osób w sali"> {{ $attendances->count() }} </span></h4>
-                <a href="{{ route('user_export', [$classes_id]) }}" class="btn btn-success btn-export" title="Wyeksportuj tabelę do xlsx"> <i class="fa fa-file-excel-o"></i> Wyeksportuj (.xlsx) </a>
+                @if($attendances->count() > 0)
+                    <a href="{{ route('user_export', [$classes_id]) }}" class="btn btn-success btn-export" title="Wyeksportuj tabelę do xlsx"> <i class="fa fa-file-excel-o"></i> Wyeksportuj (.xlsx) </a>
+                 @endif
             </div>
+            @if ($errors->any())
+                <div class="alert alert-danger invalid-feedback-alert">
+                    <ul>
+                        @foreach ($errors->all() as $error)
+                            <li>{{ $error }}</li>
+                        @endforeach
+                    </ul>
+                </div>
+            @endif
             <div class="card-body card-custom">
                 <span class="sort-span"> Sortuj: </span>
                 <input type="hidden" id="orderBy-hidden" value="{{ $orderBy }}">