feat: Implement chat functionality

app/Http/Controllers/DynamicController.php

@@ -46,7 +46,7 @@ class DynamicController extends Controller
     {
         $this->authorize('view', $dynamic);
 
-        $dynamic->load('ledgers', 'participants');
+        $dynamic->load('ledgers', 'participants', 'chat.messages.user');
 
         return Inertia::render('Dynamics/Show', [
             'dynamic' => $dynamic,

app/Http/Controllers/LedgerController.php

@@ -43,7 +43,7 @@ class LedgerController extends Controller
     {
         $this->authorize('view', $ledger);
 
-        $ledger->load('mutations.user');
+        $ledger->load('mutations.user', 'mutations.chat.messages.user');
 
         return Inertia::render('Ledgers/Show', [
             'dynamic' => $dynamic,

app/Http/Controllers/MessageController.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Http\Requests\StoreMessageRequest;
+use App\Models\Chat;
+use App\Models\Message;
+use Illuminate\Http\Request;
+
+class MessageController extends Controller
+{
+    /**
+     * Display a listing of the resource.
+     */
+    public function index()
+    {
+        //
+    }
+
+    /**
+     * Show the form for creating a new resource.
+     */
+    public function create()
+    {
+        //
+    }
+
+    /**
+     * Store a newly created resource in storage.
+     */
+    public function store(StoreMessageRequest $request, Chat $chat)
+    {
+        $chat->messages()->create([
+            ...$request->validated(),
+            'user_id' => $request->user()->id,
+        ]);
+
+        return redirect()->back();
+    }
+
+    /**
+     * Display the specified resource.
+     */
+    public function show(Message $message)
+    {
+        //
+    }
+
+    /**
+     * Show the form for editing the specified resource.
+     */
+    public function edit(Message $message)
+    {
+        //
+    }
+
+    /**
+     * Update the specified resource in storage.
+     */
+    public function update(Request $request, Message $message)
+    {
+        //
+    }
+
+    /**
+     * Remove the specified resource from storage.
+     */
+    public function destroy(Message $message)
+    {
+        //
+    }
+}

app/Http/Requests/StoreMessageRequest.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Foundation\Http\FormRequest;
+
+
+use App\Models\Chat;
+
+class StoreMessageRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        $chat = $this->route('chat');
+
+        return $chat && $this->user()->can('view', $chat->chatable);
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array|string>
+     */
+    public function rules(): array
+    {
+        return [
+            'content' => ['required', 'string'],
+        ];
+    }
+}

app/Models/Chat.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\MorphTo;
+
+class Chat extends Model
+{
+    /** @use HasFactory<\Database\Factories\ChatFactory> */
+    use HasFactory;
+
+    public function chatable(): MorphTo
+    {
+        return $this->morphTo();
+    }
+
+    public function messages(): HasMany
+    {
+        return $this->hasMany(Message::class);
+    }
+}

app/Models/Dynamic.php

@@ -7,6 +7,7 @@ use Illuminate\Database\Eloquent\Model;
 
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\MorphOne;
 
 class Dynamic extends Model
 {
@@ -27,4 +28,16 @@ class Dynamic extends Model
     {
         return $this->hasMany(Ledger::class);
     }
+
+    public function chat(): MorphOne
+    {
+        return $this->morphOne(Chat::class, 'chatable');
+    }
+
+    protected static function booted(): void
+    {
+        static::created(function (Dynamic $dynamic) {
+            $dynamic->chat()->create([]);
+        });
+    }
 }

app/Models/Message.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class Message extends Model
+{
+    /** @use HasFactory<\Database\Factories\MessageFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'chat_id',
+        'user_id',
+        'content',
+    ];
+
+    public function chat(): BelongsTo
+    {
+        return $this->belongsTo(Chat::class);
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+}

app/Models/Mutation.php

@@ -6,6 +6,7 @@ use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\MorphOne;
 
 class Mutation extends Model
 {
@@ -30,4 +31,16 @@ class Mutation extends Model
     {
         return $this->belongsTo(User::class);
     }
+
+    public function chat(): MorphOne
+    {
+        return $this->morphOne(Chat::class, 'chatable');
+    }
+
+    protected static function booted(): void
+    {
+        static::created(function (Mutation $mutation) {
+            $mutation->chat()->create([]);
+        });
+    }
 }