嵌套属性的强参数返回“不允许的参数"空数组时 [英] Strong parameters for nested attributes returns "unpermitted parameters" when empty array

问题描述

假设一个用户模型使用带有 strong_parameters 的 Rails4.

Assuming a User model using Rails4 with strong_parameters.

class User < ActiveRecord::Base
  has_secure_password

 accepts_nested_attributes_for :identity

//  rest of code omitted for brevity
end

如果我参考指南，我应该可以做到

If I refer to the guide I should be able to do

def user_params
    params.require(:user).permit(:email, identity_attributes: [])
end

允许对每个 identity_attributes 进行 mass_assignment，无论它们的名称或编号如何.但这在不允许的参数:identity_attributes"中运行

to allow mass_assignment of each identity_attributes whatever their names or number. But this run in a "Unpermitted parameters: identity_attributes"

但是如果我指定了 identity_attributes 就可以了

But if I specify the identity_attributes it works

def user_params
    params.require(:user).permit(:email, identity_attributes: [:last_name, :first_name])
end

Identity 中有很多属性，我可以通过 User 批量分配它们，而无需指定所有属性.

I have many attributes in Identity, I would be able to mass_assign them through User without specifying all of them.

我错过了什么吗?这是一个错误吗?

Am I missing something ? Is it a bug ?

干杯

推荐答案

您必须指定要更新的身份属性，包括身份实体的 :id.

You have to specify the identity's attributes you want to updated, including the :id of the identity entity.

你会有类似的东西:

def user_params 
  params.require(:user).permit(:email, identity_attributes: [:id, :last_name, :first_name]) 
end

如果你没有指定:id，Rails 将尝试创建一个实体而不是更新它.我整个周末都在使用 accepts_nested_attributes_for 在一个简单的一对多关系上挣扎，因为我没有在允许的属性中指定 id.

if you don't specify the :id, Rails will try to create an entity instead of updating it. I spend all the week-end struggling on a simple one-to-many relationship using accepts_nested_attributes_for because I didn't specified the id in the permitted attributes.

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