Add body weight logging with a trend on the dashboard

No way existed to log body weight over time - only the single
self-reported value from the signup profile - and the dashboard showed
session activity but nothing about physical progress, which is usually
the main reason people keep using a fitness app.

Adds a WeightLog model (one entry per user per day, re-logging the same
day updates it rather than duplicating), a quick-add form and trend
summary on the dashboard, and delete support.

Found and fixed a real bug along the way: the first implementation used
WeightLog::updateOrCreate() with a raw ['logged_at' => $date] match
array, which silently failed to find the same-day entry because the
`date` cast stores full datetime strings ('2026-01-01 00:00:00') while
the match array holds a plain 'Y-m-d' string - so re-logging the same
day hit a unique-constraint violation instead of updating. Fixed by
using a whereDate() lookup instead, which is comparison-format-safe.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/Http/Controllers/DashboardController.php

@@ -49,13 +49,21 @@ class DashboardController extends Controller
             ->groupBy(function ($s) { return $s->created_at->format('Y-m-d'); })
             ->map->count();
 
+        // Body weight trend
+        $weightLogs = $user->weightLogs()->orderBy('logged_at')->get(['id', 'weight_kg', 'logged_at']);
+        $weightChange = $weightLogs->count() >= 2
+            ? round($weightLogs->last()->weight_kg - $weightLogs->first()->weight_kg, 2)
+            : null;
+
         return view('dashboard', compact(
             'workoutsCount',
             'sessionsCount',
             'completedSessions',
             'completionRate',
             'recentSessions',
-            'dailyActivity'
+            'dailyActivity',
+            'weightLogs',
+            'weightChange'
         ));
     }
 }

app/Http/Controllers/WeightLogController.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\WeightLog;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
+
+class WeightLogController extends Controller
+{
+    public function store(Request $request): RedirectResponse
+    {
+        $data = $request->validate([
+            'weight_kg' => ['required', 'numeric', 'min:20', 'max:400'],
+            'logged_at' => ['nullable', 'date', 'before_or_equal:today'],
+        ]);
+
+        $loggedAt = $data['logged_at'] ?? now()->toDateString();
+
+        // updateOrCreate's raw match array compares logged_at as a literal string,
+        // which doesn't reliably match how the `date` cast stores it - use a
+        // date-aware lookup instead.
+        $entry = WeightLog::where('user_id', Auth::id())->whereDate('logged_at', $loggedAt)->first()
+            ?? new WeightLog(['user_id' => Auth::id(), 'logged_at' => $loggedAt]);
+        $entry->weight_kg = $data['weight_kg'];
+        $entry->save();
+
+        return back()->with('status', __('app.weight_log.saved'));
+    }
+
+    public function destroy(WeightLog $weightLog): RedirectResponse
+    {
+        if ($weightLog->user_id !== Auth::id()) {
+            abort(403);
+        }
+
+        $weightLog->delete();
+
+        return back()->with('status', __('app.weight_log.deleted'));
+    }
+}

app/Models/User.php

@@ -84,6 +84,11 @@ class User extends Authenticatable
         return $this->belongsToMany(YogaPose::class, 'yoga_pose_favorites')->withTimestamps();
     }
 
+    public function weightLogs()
+    {
+        return $this->hasMany(WeightLog::class);
+    }
+
     // Helpers
     public function hasFavoritedExercise(Exercise $exercise): bool
     {

app/Models/WeightLog.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class WeightLog extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'user_id',
+        'weight_kg',
+        'logged_at',
+    ];
+
+    protected $casts = [
+        'weight_kg' => 'decimal:2',
+        'logged_at' => 'date',
+    ];
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+}

database/factories/WeightLogFactory.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Database\Factories;
+
+use App\Models\User;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends \Illuminate\Database\Eloquent\Factories\Factory<\App\Models\WeightLog>
+ */
+class WeightLogFactory extends Factory
+{
+    public function definition(): array
+    {
+        return [
+            'user_id' => User::factory(),
+            'weight_kg' => fake()->randomFloat(1, 55, 110),
+            'logged_at' => fake()->dateTimeBetween('-60 days', 'now')->format('Y-m-d'),
+        ];
+    }
+}

database/migrations/2026_08_10_090532_create_weight_logs_table.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('weight_logs', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('user_id')->constrained()->cascadeOnDelete();
+            $table->decimal('weight_kg', 5, 2);
+            $table->date('logged_at');
+            $table->timestamps();
+
+            $table->unique(['user_id', 'logged_at']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('weight_logs');
+    }
+};

lang/en/app.php

@@ -231,6 +231,19 @@ return [
         'activity_30d_help' => 'Number of sessions per day (higher is better).',
     ],
 
+    'weight_log' => [
+        'title' => 'Body Weight',
+        'change_since_first' => 'Change since your first entry:',
+        'weight_kg' => 'Weight (kg)',
+        'date' => 'Date',
+        'log' => 'Log',
+        'none' => 'No weight entries yet. Log your first one to start tracking your trend.',
+        'saved' => 'Weight logged',
+        'deleted' => 'Entry deleted',
+        'delete' => 'Delete',
+        'confirm_delete' => 'Delete this entry?',
+    ],
+
     'admin' => [
         'title' => 'Admin Dashboard',
         'subtitle' => 'Manage content and see overall site statistics.',

lang/ro/app.php

@@ -231,6 +231,19 @@ return [
         'activity_30d_help' => 'Număr de sesiuni pe zi (mai mult este mai bine).',
     ],
 
+    'weight_log' => [
+        'title' => 'Greutate corporală',
+        'change_since_first' => 'Schimbare de la prima înregistrare:',
+        'weight_kg' => 'Greutate (kg)',
+        'date' => 'Data',
+        'log' => 'Adaugă',
+        'none' => 'Nicio înregistrare încă. Adaugă prima pentru a-ți urmări evoluția.',
+        'saved' => 'Greutate înregistrată',
+        'deleted' => 'Înregistrare ștearsă',
+        'delete' => 'Șterge',
+        'confirm_delete' => 'Ștergi această înregistrare?',
+    ],
+
     'admin' => [
         'title' => 'Panou de administrare',
         'subtitle' => 'Gestionează conținutul și vezi statisticile generale ale site‑ului.',

resources/views/dashboard.blade.php

@@ -88,5 +88,51 @@
                 </div>
             </div>
         </div>
+
+        <div class="mt-8 rounded-2xl ring-1 ring-gray-200 dark:ring-gray-700 bg-white dark:bg-gray-800 p-5">
+            <div class="flex items-center justify-between flex-wrap gap-3">
+                <div>
+                    <h2 class="text-lg font-semibold text-gray-900 dark:text-white">{{ __('app.weight_log.title') }}</h2>
+                    @if($weightChange !== null)
+                        <p class="mt-1 text-sm text-gray-600 dark:text-gray-300">
+                            {{ __('app.weight_log.change_since_first') }}
+                            <span class="font-semibold {{ $weightChange < 0 ? 'text-emerald-600' : ($weightChange > 0 ? 'text-amber-600' : 'text-gray-600') }}">
+                                {{ $weightChange > 0 ? '+' : '' }}{{ $weightChange }} kg
+                            </span>
+                        </p>
+                    @endif
+                </div>
+                <form method="POST" action="{{ route('weight-logs.store') }}" class="flex items-end gap-2">
+                    @csrf
+                    <div>
+                        <label class="block text-xs font-medium text-gray-500 dark:text-gray-400">{{ __('app.weight_log.weight_kg') }}</label>
+                        <input type="number" step="0.1" min="20" max="400" name="weight_kg" required class="mt-1 w-28 rounded-lg border-gray-300 dark:border-gray-700 bg-white/80 dark:bg-gray-900 text-gray-900 dark:text-gray-100 px-3 py-2 text-sm">
+                    </div>
+                    <div>
+                        <label class="block text-xs font-medium text-gray-500 dark:text-gray-400">{{ __('app.weight_log.date') }}</label>
+                        <input type="date" name="logged_at" max="{{ now()->toDateString() }}" value="{{ now()->toDateString() }}" class="mt-1 rounded-lg border-gray-300 dark:border-gray-700 bg-white/80 dark:bg-gray-900 text-gray-900 dark:text-gray-100 px-3 py-2 text-sm">
+                    </div>
+                    <button type="submit" class="inline-flex items-center rounded-lg bg-indigo-600 px-3 py-2 text-sm font-semibold text-white hover:bg-indigo-500">{{ __('app.weight_log.log') }}</button>
+                </form>
+            </div>
+
+            @if($weightLogs->isEmpty())
+                <div class="mt-4 rounded-xl border border-dashed border-gray-300 dark:border-gray-700 p-6 text-sm text-gray-600 dark:text-gray-300">{{ __('app.weight_log.none') }}</div>
+            @else
+                <div class="mt-4 flex flex-wrap gap-2">
+                    @foreach($weightLogs->reverse()->take(10) as $log)
+                        <div class="inline-flex items-center gap-2 rounded-full bg-gray-100 dark:bg-gray-900 ring-1 ring-gray-200 dark:ring-gray-700 pl-3 pr-1.5 py-1 text-sm">
+                            <span class="font-semibold text-gray-900 dark:text-white">{{ rtrim(rtrim(number_format($log->weight_kg, 1), '0'), '.') }} kg</span>
+                            <span class="text-gray-500">{{ $log->logged_at->format('M j') }}</span>
+                            <form method="POST" action="{{ route('weight-logs.destroy', $log) }}" onsubmit="return confirm('{{ __('app.weight_log.confirm_delete') }}');">
+                                @csrf
+                                @method('DELETE')
+                                <button type="submit" class="text-gray-400 hover:text-red-500 rounded-full h-5 w-5 inline-flex items-center justify-center" aria-label="{{ __('app.weight_log.delete') }}">&times;</button>
+                            </form>
+                        </div>
+                    @endforeach
+                </div>
+            @endif
+        </div>
     </section>
 </x-app-layout>

routes/web.php

@@ -30,6 +30,10 @@ Route::middleware('auth')->group(function () {
 
     // Exercise alias (per-user rename)
     Route::post('/exercises/{exercise}/alias', [\App\Http\Controllers\ExerciseAliasController::class, 'store'])->name('exercises.alias');
+
+    // Body weight log
+    Route::post('/weight-logs', [\App\Http\Controllers\WeightLogController::class, 'store'])->name('weight-logs.store');
+    Route::delete('/weight-logs/{weightLog}', [\App\Http\Controllers\WeightLogController::class, 'destroy'])->name('weight-logs.destroy');
 });
 
 Route::prefix('/exercises')->group(function () {

tests/Feature/WeightLogTest.php

@@ -0,0 +1,89 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\User;
+use App\Models\WeightLog;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class WeightLogTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_guest_cannot_log_weight(): void
+    {
+        $response = $this->post(route('weight-logs.store'), ['weight_kg' => 80]);
+
+        $response->assertRedirect(route('login'));
+    }
+
+    public function test_user_can_log_weight_for_today(): void
+    {
+        $user = User::factory()->create();
+
+        $response = $this->actingAs($user)->post(route('weight-logs.store'), [
+            'weight_kg' => 82.5,
+        ]);
+
+        $response->assertRedirect();
+        $entry = WeightLog::where('user_id', $user->id)->first();
+        $this->assertNotNull($entry);
+        $this->assertEquals(82.5, $entry->weight_kg);
+        $this->assertEquals(now()->toDateString(), $entry->logged_at->toDateString());
+    }
+
+    public function test_logging_twice_for_the_same_date_updates_the_entry(): void
+    {
+        $user = User::factory()->create();
+
+        $this->actingAs($user)->post(route('weight-logs.store'), [
+            'weight_kg' => 80,
+            'logged_at' => '2026-01-01',
+        ]);
+        $this->actingAs($user)->post(route('weight-logs.store'), [
+            'weight_kg' => 81,
+            'logged_at' => '2026-01-01',
+        ]);
+
+        $this->assertEquals(1, WeightLog::where('user_id', $user->id)->count());
+        $entry = WeightLog::where('user_id', $user->id)->first();
+        $this->assertEquals(81, $entry->weight_kg);
+        $this->assertEquals('2026-01-01', $entry->logged_at->toDateString());
+    }
+
+    public function test_future_date_is_rejected(): void
+    {
+        $user = User::factory()->create();
+
+        $response = $this->actingAs($user)->post(route('weight-logs.store'), [
+            'weight_kg' => 80,
+            'logged_at' => now()->addDay()->toDateString(),
+        ]);
+
+        $response->assertSessionHasErrors('logged_at');
+    }
+
+    public function test_owner_can_delete_their_entry(): void
+    {
+        $user = User::factory()->create();
+        $log = WeightLog::factory()->create(['user_id' => $user->id]);
+
+        $response = $this->actingAs($user)->delete(route('weight-logs.destroy', $log));
+
+        $response->assertRedirect();
+        $this->assertDatabaseMissing('weight_logs', ['id' => $log->id]);
+    }
+
+    public function test_other_user_cannot_delete_someone_elses_entry(): void
+    {
+        $owner = User::factory()->create();
+        $other = User::factory()->create();
+        $log = WeightLog::factory()->create(['user_id' => $owner->id]);
+
+        $response = $this->actingAs($other)->delete(route('weight-logs.destroy', $log));
+
+        $response->assertForbidden();
+        $this->assertDatabaseHas('weight_logs', ['id' => $log->id]);
+    }
+}