Has One的嵌套属性表单

Question

我正在尝试使用具有belongs_to和has_one

关系的嵌套属性表单

我在模型中定义了关系，如

class Merchant < ActiveRecord::Base

  has_one :account, dependent: :destroy

class Account < ActiveRecord::Base

  belongs_to :merchant

控制器

def edit
    @merchant = Merchant.find(params[:id])
    @merchant.account.build
    @states = State.form_selector
    @products = Product.all
    @properties = Property.where(property_set_id: 1)
  end

错误

NoMethodError (undefined method `build' for nil:NilClass):
  app/controllers/admin/merchants_controller.rb:32:in `edit'

Answer 1

has_one关联的构建语法：

@merchant.build_account  # this will work

@merchant.account.build  # this will throw error

阅读has_one association documentation了解更多详情。

此外，您应该检查是否找到@marchant

的id