Question

注意：我读过几篇与此类似的帖子。但是没有解决方案对我有用我有两个对象Appeal和Appealer，有一对多的关系。保存Appeal对象时，将保存所有字段，并保存appealer id（如FK）。但是在Appealer表中保存了一条新记录，除了id之外没有任何数据。

MODEL

class Appeal < ActiveRecord::Base
    belongs_to :appealer, :autosave => true
    accepts_nested_attributes_for :appealer
end

class Appealer < ActiveRecord::Base
    has_many :appeals, :autosave => true
end

AppealsController

class AppealsController < ApplicationController
    def index
        respond_with Appeal.all
    end

    def create
        appealer = Appealer.create(appealer_params)
        @appeal = Appeal.create(appeal_params)
        @appeal.appealer = appealer


        if @appeal.save
          respond_with @appeal
        else
          respond_with {:error}
        end
    end

    def show
        respond_with Appeal.find(params[:id])
    end

    private
    def appeal_params
        params.require(:appeal).permit(:subject, :status, :submit_means, :card_type, :submit_date, :relationship, :report_date, :explanation, :email_approval)
    end
    def appealer_params
        params.require(:appeal).permit(appealer: [:appealer_id, :first_name, :last_name])
    end
end

修改这是我使用的json

{
        "id": 21,
        "subject": "axxxscaaaa",
        "status": "happy",
        "submit_means": "DOAR",
        "card_type": "sdsd",
        "submit_date": 1466629200000,
        "relationship": null,
        "report_date": 1466542800000,
        "explanation": "sdsd",
        "email_approval": null,
        "appealer": {"first_name":"aaaaaaa", "last_name":"fffff"},
        "selfRequest": false,
        "created_at": 1465851600000,
        "updated_at": 1465333200000
    }

我不明白为什么上诉人的字段没有保存

Answer 1

当您显示JSON对象时，您没有在视图表单上使用rails fields_for或其他内容。因此，您的模型中不需要这个（ accepts_nested_attributes_for：appealer ）行。模型应该是这样的：
```
id
```
接下来，在你当前的逻辑中，对于你的appealer_params，用这个改变appealer_params方法：
```
B
```

为您的方案创建操作逻辑：

  class Appeal < ActiveRecord::Base
    belongs_to :appealer, :autosave => true
  end

Answer 2

试试这个

def appeal_params
   params.require(:appeal).permit(:subject, :status, :submit_means, :card_type, :submit_date, :relationship, :report_date, :explanation, :email_approval, appealers_attributes: [:id, :first_name, :last_name] )
end

并删除此行appealer = Appealer.create(appealer_params)

Rails 4 - belongs_to嵌套对象字段未保存

2 个答案: