讨论数量:
比如 User 要统计他下面的门店数量
# 第一种 $user->stores_count;
$user = User::withCount(['stores'])->find(1);
# 第二种 $user->xxx;
$user = User::withCount(['stores as xxx' ])->find(1);
比如 User 要统计他下面的门店数量
# 第一种 $user->stores_count;
$user = User::withCount(['stores'])->find(1);
# 第二种 $user->xxx;
$user = User::withCount(['stores as xxx' ])->find(1);
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