Question

我的模型代码

class Bank < ApplicationRecord
    has_one :address
    accepts_nested_attributes_for :address
end



 class Address < ApplicationRecord
    belongs_to :bank
 end

我的控制器

def create
    @bank = Bank.new(bank_params)

    respond_to do |format|
      if @bank.save
        format.html { redirect_to @bank, notice: 'Bank was successfully created.' }
        format.json { render :show, status: :created, location: @bank }
      else
        format.html { render :new }
        format.json { render json: @bank.errors, status: :unprocessable_entity }
      end
    end
end

def bank_params
      params.require(:bank).permit(:code, :currency, :name, :mobile_1, :mobile_2, :email, address_attributes: [:id, :name, :area, :pin_code, :city_id] )
end

它给出了类似的错误

@messages = {：＆＃34; address.bank＆＃34; =＆gt; [＆＃34;必须存在＆＃34;]}，@ details = {＆＃34; address.bank＆＃34 ; =＆GT; [{：误差=＆GT;：空白}

为什么它表现出反向......不理解

Answer 1

我确定这是因为您的地址模型已经对银行进行了验证。鉴于观察结果，我认为Rails试图：

validate your parent model
validate your child model # validation fails here because parent doesn't have an id yet, because it hasn't been saved
save parent model
save child model

但是，我认为您应该可以使用:inverse_of选项解决此问题，如下所示：

class Bank < ApplicationRecord
    has_one :address, inverse_of: :bank
    accepts_nested_attributes_for :address
end

class Address < ApplicationRecord
  belongs_to :bank, inverse_of: :address
  validates :bank, presence: true
end

让我知道这是否适合您

Answer 2

Rails 5默认需要belongs_to关联

By using (optional: true), we can change behavior 

class Bank < ApplicationRecord
    has_one :address, optional: true
    accepts_nested_attributes_for :address
end



 class Address < ApplicationRecord
    belongs_to :bank, optional: true
 end

Rails 5 +嵌套属性，其中has_one在创建时具有错误

2 个答案: