Models

app/Article.php

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+<?php
+
+namespace App;
+
+use GoldSpecDigital\LaravelEloquentUUID\Database\Eloquent\Uuid;
+use Illuminate\Database\Eloquent\Model;
+use App\Source;
+use App\Topic;
+
+class Article extends Model
+{
+    use Uuid;
+
+    /**
+     * The "type" of the auto-incrementing ID.
+     *
+     * @var string
+     */
+    protected $keyType = 'string';
+
+    /**
+     * Indicates if the IDs are auto-incrementing.
+     *
+     * @var bool
+     */
+    public $incrementing = false;
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $guarded = [];
+
+    public function source()
+    {
+        return $this->belongsTo(Source::class);
+    }
+
+    public function topics()
+    {
+        return $this->belongsToMany(Topic::class);
+    }
+}

app/Source.php

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+<?php
+
+namespace App;
+
+use Illuminate\Database\Eloquent\Model;
+use App\Article;
+
+class Source extends Model
+{
+    public function articles()
+    {
+        return $this->hasMany(Article::class);
+    }
+}

app/Topic.php

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+<?php
+
+namespace App;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Topic extends Model
+{
+    //
+}