Laravel 使用 Sum 和 Groupby

问题描述

我想获取每个月的数量总和，以便我可以在条形图上显示每月的数量

I would like to fetch sum of quantity in each month, so that I can display on bar chart quantities against month

这就是我想的，但没有锻炼

This is what I thought but didn't workout

 $data1 = Borrow::groupBy(function($d) {
 return Carbon::parse($d->created_at)->format('m')->sum('quantity');
 })->get();

我的表结构

Schema::create('borrows', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('member_id');
        $table->integer('book_id');
        $table->integer('quantity');
        $table->integer('status')->default(0);
        $table->timestamps();
    });

推荐答案

that a collection group by not an eloquent groupby

that a collection group by not an eloquent groupby

如果你想用 eloquent 来做，必须:

if you want to do it with eloquent, gotta:

 $data1 = Borrow::selectRaw('SUM(quantity) as qt, MONTH(created_at) as borrowMonth')
      ->groupBy('borrowMonth')->get();

如果你想用集合 groupBy 方法来做，你应该先做 get，然后是 groupBy.

if you want to do it with the collection groupBy method, you should first do the get, then the groupBy.

就像，虽然我不确定你在回调中所做的事情要完成什么..

As in, though im not sure what you're trying to accomplish with what you do inside the callback..

 $data1 = Borrow::get()->groupBy(function($d) {
 return Carbon::parse($d->created_at)->format('m')->sum('quantity');
 });

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