如何在 symfony 3 中将对象数组转换为字符串? [英] How to convert an array of objects as string in symfony 3?
问题描述
在 b/w 2 实体(产品和报价)中实现多对多关系时出现以下错误:
I'm getting the following error while implementing the many-to-many relationship in b/w 2 entities(Product & Offer):
可捕获的致命错误:FoodBundle\Entity\Product 类的对象可以不会被转换成字符串
Catchable Fatal Error: Object of class FoodBundle\Entity\Product could not be converted to string
产品实体与要约实体的关系.我的目标是利用多对多关系的产品报价.
Where Product entity is in relation with the Offer entity. My aim here was to avail offers to products in many-to-many relationship.
这段代码正在创建它，正如我从错误中猜测的那样.
This piece of code is creating it as I guess from the error.
class Offer
{
public function addProduct(\FoodBundle\Entity\Product $product)
{
$this->product[] = $product;
return $this;
}
}
请帮我解决这个问题.
推荐答案
当您自动创建 CRUD 时，此问题很常见.
This problem is common when you've created the CRUD automatically.
问题是你需要从一个中选择一个Product in the Offer form，symfony无法绘制select，因为Product类未指定应呈现哪个字段.
The problem is that you need to select from a <select> a Product in the Offer form and symfony cannot draw the select because the Product class doesn't specify which field should be rendered.
转到您的产品实体并添加神奇的 __toString 方法(如果可以，请提供它)，它应该如下所示:
Go to your Product Entity and add the magic __toString method (provide it if you can) and it should look like :
class Product {
public function __toString(){
// Or change the property that you want to show in the select.
return $this->name;
}
}
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