为什么此查询在Laravel 5.1中不起作用？

Question

Why this query:

$data = Category::find(3)->articles->where('publish', '1')->paginate(5);

doesn't work? The select query: $data = Category::where('publish', '1')->paginate(5); works.

Version laravel: 5.1. In table categories there are one-to-many relationships with table articles .

Answer 1

articles returns collection and articles() returns relation . You can use where on relation and not on collection .

change

$data = Category::find(3)->articles->where('publish', '1')->paginate(5);

to

$data = Category::find(3)->articles()->where('publish', '1')->paginate(5);