GETTING ALL THE CATEGORY WITH ITS CHANNELS WHERE CATEGORY SLUG = ANIMAL
Category::with(['channels'])->where('slug', 'animal')->get();
GETTING ALL THE CATEGORY WITH ITS CHANNELS WHERE HAS A CHANNEL SLUG = ANIMAL
Category::with(['channels'])->whereHas('channels'=>function($q){ $q->where('slug','animal'); })->get();
GETTING ALL THE CATEGORY WITH ONLY CHANNELS THAT HAS A SLUG = ANIMAL
Category::with(['channels'=>function($q){ $q->where('slug','animal'); }])->get();