Laravel count 中的行数有很多关系

Question

How can I count the number of rows in a has many relationship.

The database is set up like this for example:

users:
user_id

files:
id,
name

visitors:
id,
file_id

I want to get the collective TOTAL number of visitors for every file that belongs to a certain user.

My current code is this:

$visitors = Auth::user()->files()->with('Visitors')->get();
$visitors = $visitors->count('visitor.id');

But that only returns the total amount of files, not the total amount of visitors.

Answer 1

Since you have cascade relations:

User hasMany File hasMany Visitor

the easiest way to work with User - Visitor relation will be hasManyThrough :

// User model
public function visitors()
{
  return $this->hasManyThrough('Visitor', 'File');
}

Then all you need to get user's all files visitors' count is:

$user->visitors()->count();