Laravel 5 Querying with relations causes "Call to a member function addEagerConstraints() on null" error

You are missing return statements in the methods that define relations. They need to return relation definition.

Replace

public function roles()
{
    $this->belongsToMany('\App\Role', 'fk_user_role', 'user_id', 'role_id');
}

With

public function roles()
{
    return $this->belongsToMany('\App\Role', 'role_user', 'user_id', 'role_id');
}

You forgot the return in your functions

Do:

return $this->belongsToMany('\App\User', 'fk_role_user', 'role_id', 'user_id');

return $this->belongsToMany('\App\Role', 'fk_user_role', 'user_id', 'role_id');

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