php - how can i use relationship in laravel? -

my schema follows:

channel table: id int unsigned primary key auto increment, name varchar(30) not null, ...  category table: id int unsigned primary key auto increment, channel_id int unsigned index, name varchar(30) not null, ...  article table: id int unsigned primary key auto increment, category_id int unsigned index, title varchar(90) not null, content text not null, ... 

so, every article belong specific category , category belongs specific channel.

my question is:

how can search articles category name , channel name (the relationship ready in code)?

i have tried

$articles = app\article::latest()->with('category')->with('channel')->get(); 

but not work, can me? thank time.

if want search through related tables should use joins this:

$articles = app\article::latest()     ->select('article.*')     ->join('category', 'category.id', '=', 'category_id')     ->join('channel', 'channel.id', '=', 'channel_id')     ->where('category.name', 'like', "%{$name}%")     ->orwhere('channel.name', 'like', "%{$name}%")     ->groupby('article.id')     ->get();