由 & 组成字段_for
所以我读过&重新阅读 Stephen Chu 关于该主题的文章 (http://www .stephenchu.com/2008/05/rails-composedof-validation.html），但是我只是没有运气。
中提供的示例，
根据 Money gem 文档 Money.rubyforge .org Model
class Payment < ActiveRecord::Base
composed_of :amount,
:class_name => "Money",
:mapping => [%w(cents cents), %w(currency currency_as_string)],
:constructor => Proc.new { |cents, currency| Money.new(cents || 0, currency || Money.default_currency) }
end
Nice Skinny Controller
class PaymentsController < ApplicationController
def create
@payment = Payment.new(params[:payment])
...
end
end
View (HAML)
- form_for @payment do |p|
- p.fields_for :amount, @payment.amount do |a|
= a.label :cents
= a.text_field :cents
= a.label :currency
= a.text_field :currency, :value => :usd
我收到的错误是： undefined method `cents' for {"cents"=>"6.66", "currency"=>"usd"}:HashWithIn DifferentAccess
'amount' 哈希值被作为 'cents' 传递到composed_of 中，但根据文章，它应该使用表单中参数中的“金额”属性。我真的被困住了:/
So I have read & re-read the Stephen Chu article on the topic (http://www.stephenchu.com/2008/05/rails-composedof-validation.html), however I am just not having any luck.
Per the example on provided in the money gem documentation money.rubyforge .org
Model
class Payment < ActiveRecord::Base
composed_of :amount,
:class_name => "Money",
:mapping => [%w(cents cents), %w(currency currency_as_string)],
:constructor => Proc.new { |cents, currency| Money.new(cents || 0, currency || Money.default_currency) }
end
Nice skinny controller
class PaymentsController < ApplicationController
def create
@payment = Payment.new(params[:payment])
...
end
end
View (HAML)
- form_for @payment do |p|
- p.fields_for :amount, @payment.amount do |a|
= a.label :cents
= a.text_field :cents
= a.label :currency
= a.text_field :currency, :value => :usd
The error I receive is:
undefined method `cents' for {"cents"=>"6.66", "currency"=>"usd"}:HashWithIndifferentAccess
The 'amount' hash is being passed into composed_of as 'cents', but according to the article, it should use the attributes of 'amount' in params from the form. I'm just really stuck :/
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编辑：我之前误解了你的问题。是的，在您的表单中，您需要这样引用
amount：Edit: I misunderstood your question before. Yes, in your forms you need to reference
amountthis way: