Ruby-on-rails Rails 5 中不允许的参数
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Unpermitted parameter in Rails 5
提问by developer033
First of all I want simply get an object inside the current object that I'm sending to my backend.
首先，我只想在我发送到后端的当前对象中获取一个对象。
I have this simple JSON(generated from a form):
我有这个简单的JSON（从表单生成）：
{
"name": "Project 1",
"project_criteria": [
{
"name": "Criterium 1",
"type": "Type 1",
"benefit": "1"
},
{
"name": "Criterium 2",
"type": "Type 2",
"benefit": "3"
}
]
}
My classes:
我的classes：
class Project < ApplicationRecord
has_many :project_criteria
accepts_nested_attributes_for :project_criteria
end
class ProjectCriterium < ApplicationRecord
belongs_to :project
end
ProjectsController:
项目控制器：
def project_params
params.require(:project).permit(:name, project_criteria: [] )
end
But I still can't access project_criteriaparameter as you can see below:
但是我仍然无法访问project_criteria参数，如下所示：
Started POST "/projects" for 127.0.0.1 at 2016-08-19 16:24:03 -0300
Processing by ProjectsController#create as HTML
Parameters: {"project"=>{"name"=>"Project 1", "project_criteria"=>{"0"=>{"benefit"=>"1", "name"=>"Criterium 1", "type"=>"Type 1"}, "1"=>{"benefit"=>"3", "name"=>"Criterium 2", "type"=>"Type 2"}}}}
Unpermitted parameter: project_criteria # <-----------
Note:
笔记：
By the way, I already tried to use criteriuminstead of criteria(which - in my opinion -is the correct since it should be pluralized) in has_manyand accepts_nested_attributes_for, but it also doesn't work.
顺便说一下，我已经尝试在and 中使用标准而不是标准（在我看来，这是正确的，因为它应该复数形式），但它也不起作用。has_manyaccepts_nested_attributes_for
Does someone have a solution for this?
有人对此有解决方案吗？
回答by MarsAtomic
It's not the inflection of the word "criteria" that's giving you problems (although you can add a custom inflector to get the singular and plural versions you prefer if you really want).
给您带来问题的不是“标准”一词的变形（尽管您可以添加自定义变形器来获得您喜欢的单数和复数版本，如果您真的想要的话）。
The issue is that you have to explicitly permit the fields of nested objects.
问题是您必须明确允许嵌套对象的字段。
Change your current params:
更改您当前的参数：
params.require(:project).permit(:name, project_criteria: [] )
To this (for a single nested object):
为此（对于单个嵌套对象）：
params.require(:project).permit(:name, project_criteria: [:name, :type, :benefit] )
Your case is somewhat compounded by the fact that you're dealing with multiple nested objects, so you'll have to pass a hash instead:
由于您正在处理多个嵌套对象，因此您的情况有些复杂，因此您必须改为传递哈希：
params.require(:project).permit(:name, { project_criteria: [:name, :type, :benefit]} )
