Question

我有一个用户类，可以选择使用帐单邮寄地址。当我发布付款表单时，假设用户已表明他们想要保存他们的帐单邮寄地址详细信息，我想要创建新的地址记录或更新原始地址记录。

我尝试了很多东西，但我能找到最接近工作代码的是......

class User
  include DataMapper::Resource
  property :id,          Serial
  property :provider,    String, :length => 100
  property :identifier,  String, :length => 100
  property :username,    String, :length => 100
  property :remember_billing, Boolean
  has 1, :billing_address
end

class BillingAddress
  include DataMapper::Resource
  property :first,       String, :length => 20
  property :surname,     String, :length => 20
  property :address1,    String, :length => 50
  property :address2,    String, :length => 50
  property :towncity,    String, :length => 40
  property :state,       String, :length => 2
  property :postcode,    String, :length => 20
  property :country,     String, :length => 2
  property :deleted_at,  ParanoidDateTime
  belongs_to :user, :key => true
end

post "/pay" do
  @post = params[:post]
  @addr = params[:addr]
  if @addr == nil
    @addr = Hash.new
  end

  user = User.first(:identifier => session["vya.user"])
  user.remember_billing = !!@post["remember"]

  if user.remember_billing
    user.billing_address = BillingAddress.first_or_create({ :user => user }, @addr)
  end
  user.save
  ...

在没有记录时工作正常。但如果已有记录，它会保留原始值。

我看到了类似的帖子 DataMapper: Create new record or update existing 但如果我改变代码

user.billing_address = BillingAddress.first_or_create(:user => user).update(@addr)

我收到错误

DataMapper::ImmutableError at /pay
Immutable resource cannot be modified

任何帮助非常感谢

Answer 1

你在那里将许多东西链接在一起。怎么样：

billing = BillingAddress.first_or_new(:user => user, @addr) #don't update, send the hash as second parameter
billing.saved? ? billing.update(@addr) : billing.save
raise "Billing is not saved for some reason: #{billing.errors.inspect}" unless billing && billing.saved?
user.billing_address = billing
user.save

Ruby / Datamapper创建或更新问题 - 不可变的错误

1 个答案: