laravel 在整数上调用成员函数 addEagerConstraints()
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Call to a member function addEagerConstraints() on integer
提问by Juliatzin
I tried to eager load a relation:
我试图急切地加载一个关系：
$tournaments = Tournament::with('numCompetitors')->latest()->paginate(config('constants.PAGINATION'));
My relation in Tournament returns an integer:
我在锦标赛中的关系返回一个整数：
public function numCompetitors()
{
return $this->competitors()->count(); // it returns 24
}
With that I get:
我得到：
Call to a member function addEagerConstraints() on integer
I don't understand why is it failing.
我不明白为什么它失败了。
回答by Alexey Mezenin
You're doing it wrong. If you want to count relationship, use withCount()with properly defined relationship:
你这样做是错的。如果要计算关系，请使用withCount()正确定义的关系：
Tournament::withCount('competitors')->latest()->paginate(config('constants.PAGINATION'));
If you want to count the number of results from a relationship without actually loading them you may use the withCount method, which will place a
{relation}_countcolumn on your resulting models.
如果您想计算关系中的结果数量而不实际加载它们，您可以使用 withCount 方法，它将
{relation}_count在您的结果模型上放置一列。
https://laravel.com/docs/5.4/eloquent-relationships#counting-related-models
https://laravel.com/docs/5.4/eloquent-relationships#counting-related-models
