feat: Implement chat functionality

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([]);
+        });
+    }
 }