制作一个包含两个单独值的表单类型，您可以使用 symfony 4 添加多次 [英] Making a form type with two separate values in it that you can add several times with symfony 4

问题描述

我是 Symfony 的新手，我想使用 symfony 4 做一些事情.为了简化它，假设我有一个购物篮，我可以在其中添加或删除文章并选择我选择的每篇文章的数量.

I'm new to Symfony and I want to do something using symfony 4. To simplify it, let's say for example I have a shopping basket where I can add or remove articles AND select the amount of each article I've chosen.

所以在教义方面我有三个实体:

So on the doctrine side I have three entities :

class Basket {
   protected $id;
   protected $name;
}

class Article{
   protected $id;
   protected $name;
}

class Buying {
   //ManyToOne
   protected $basket;
   //ManyToOne
   protected $article;

   protected $count;
}

我已经通过手工制作 HTML 并使用一些讨厌的 JS 代码完成了这个表单，但现在我想使用 Symfony 4 的表单来制作它.

I've done this form by making the HTML by hand and using some nasty JS code, but now I'd like to make this using Symfony 4's Forms.

我认为最好的方法是为具有两个字段的购买"实体创建我自己的表单类型，其中一个是包含每篇文章的 Select，另一个是 $count 值，然后有可以根据需要添加尽可能多的购买"，但我想不出一种方法来做到这一点，而且文档似乎没有涵盖这种情况.

I thought the best way would be to create my own form type for that "Buying" entity which would have two fields, one of them being a Select containing every articles, and the other being the $count value, and then have the possibility to add as many "Buyings" as I want, but I can't think of a way to do this and the documentation don't seem to cover this kind of case.

推荐答案

为此您需要几种表单类型，并且您可能需要稍微调整一下您的实体.这是它的要点:

You'd need a couple of form types for this and you may need to jiggle your entities a bit. Here's the gist of it:

首先，您需要为购买的每件商品及其数量提供一个.EntityType 会给你select 包含您所有的文章，正是您要查找的内容.

First you need one for each individual item purchased and its count. The EntityType will give you a select with all your articles, exactly what you are looking for.

// BuyingType.php
$builder->add('article', EntityType::class, ['class' => Article::class]);
$builder->add('count', NumberType::class, [
    'constraints' => [
        new Count(['min' => 1]),
      ],
]);

第二个将是 CollectionType 代表整个篮子.

The second one will be a CollectionType representing the whole basket.

// BasketType.php
$builder->add('basket', CollectionType::class, [
    'entry_type' => BuyingType::class,
    'allow_add' => true,
    'allow_delete' => true,
]);

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