Laravel nested eager loading can't work as expected - laravel-5

Question

This problem has troubled me for days, I cannot solve this problem until now, so I have to ask for help.
Below is the relevant code snippet:
Model Category.php
public function child()
{
return $this->hasMany('App\Http\Models\Category', 'pid', 'id');
}
public function logs()
{
return $this->hasMany('App\Http\Models\Log', 'cate_id');
}
public function products()
{
return $this->hasMany('App\Http\Models\Product', 'cate_id');
}
public function newProduct()
{
return $this->products()->orderBy('created_at', 'desc');
}
public function latestLog()
{
return $this->logs()->where([
'product_id' => $this->newProduct()->first()->id,
'status' => 1,
])->orderBy('created_at', 'desc');
}
Controller CategoryController.php
public function getLatestLog()
{
// Category with id 1 with nested eager loading
$subCategory = Category::find(1)
->with(['child.newProduct', 'child.latestLog'])
->first()->child;
// Get latest log for subCategory with id 3
dd($subCategory->find(3)->latestLog);
}
In this case, I want to use nested eager loading to get latest log. But what bothers me is when I add child.checkLatestLog it just outputs empty, but when I delete it, it will output normally.
I think the problem is related to the $this->newProduct()->first()->id variable. Because I tried to manually enter a product ID that exists in the log table, it's worked normal.
It may be my fault, but I don't know where it was wrong. I would like to thank you for asking for help.
update
A solution for this Question:
public function latestLog()
{
return $this->hasManyThrough(
'App\Http\Models\Log',
'App\Http\Models\Product',
'cate_id',
'product_id',
'id',
'id'
)->orderBy('created_at', 'desc');
}

Answer 1

The problem is $this->newProduct()->first()->id: You can't use eager loading with model-dependent attributes like that.
You'll have to use a JOIN solution.