使用表单选择使用Money gem设置货币

我已经在这个工作了几个小时，但我无法弄清楚这一个。

我愿意让用户为他填写表格的价格选择相应的货币。

我正在使用Money Gem（https://github.com/RubyMoney/money）。 所有值都设置正确但不是仅通过表单发送的设置为其默认值（USD）的货币。 我想这是我对Moneygem缺乏经验。

在我的模型中：

require 'money' composed_of :price_per_unit, :class_name => "Money", :mapping => [%w(cents_per_unit cents), %w(currency currency_as_string)], :constructor => Proc.new { |cents_per_unit, currency| Money.new(cents_per_unit || 0, currency || Money.default_currency) }, :converter => Proc.new { |value| value.respond_to?(:to_money) ? value.to_money : raise(ArgumentError, "Can't convert #{value.class} to Money") } composed_of :total_price, :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) }, :converter => Proc.new { |value| value.respond_to?(:to_money) ? value.to_money : raise(ArgumentError, "Can't convert #{value.class} to Money") } 

：price_per_unit和：total_price共享：currency属性。

：price_per_unit使用cents_per_unit和货币：total_price使用美分和货币

在我的控制器中：

  def new @power_plant_substrate = PowerPlantSubstrate.new # preparing the form select for the currencies @currencies = [] major_currencies(Money::Currency::TABLE).each do |currency| name = Money::Currency::TABLE[currency][:name] iso_code = Money::Currency::TABLE[currency][:iso_code] @currencies << [name, iso_code] end end 

在我的新表单视图中：

  
  
 
   5, :value => 0, :step => 0.01, :min => 0 %> 
 
   1, :size => 10, :value => 0 } %>  

我确实尝试将默认货币更改为AUD，然后我的所有记录都设置为AUD，无论我选择哪个。

在我的日志中：

 Started POST "/power_plant_substrates" for 127.0.0.1 at 2011-11-03 00:40:38 +0100 Processing by PowerPlantSubstratesController#create as JS Parameters: {"utf8"=>"✓", "feedstock"=>"", "power_plant_substrate"=>{"power_plant_id"=>"59", "substrate_id"=>"159", "quantity"=>"1", "trade"=>"selling", "currency"=>"JPY", "price_per_unit"=>"1.00", "total_price"=>"1", "address"=>"Pélussin, France", "transport"=>"pickup_only", "latitude"=>"", "longitude"=>"", "description"="sadf"}, "commit"=>"Save"} User Load (0.3ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1 [["id", 21]] PowerPlant Load (0.3ms) SELECT "power_plants".* FROM "power_plants" WHERE "power_plants"."user_id" = 21 AND "power_plants"."name" = 'My Tradings' LIMIT 1 SQL (0.7ms) INSERT INTO "power_plant_substrates" ("address", "cents", "cents_per_unit", "created_at", "currency", "description", "gmaps", "latitude", "locale", "longitude", "period","power_plant_id", "quantity", "state", "substrate_id", "trade", "transport","unit_of_measure", "updated_at") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?,?, ?, ?, ?, ?) [["address", "Pélussin, France"], ["cents", 100], ["cents_per_unit", 100], ["created_at", Wed, 02 Nov 2011 23:40:39 UTC +00:00], ["currency", "CAD"], ["description", "sadf"], ["gmaps", true], ["latitude", 45.417608], ["locale", "us"], ["longitude", 4.676041], ["period", "year"], ["power_plant_id", 59], ["quantity", 1], ["state", "open"], ["substrate_id", 159], ["trade", "selling"], ["transport", "pickup_only"], ["unit_of_measure", "mass"], ["updated_at", Wed, 02 Nov 2011 23:40:39 UTC +00:00]] Completed 200 OK in 1107ms (Views: 4.3ms | ActiveRecord: 2.5ms) 

有任何想法吗？

干杯，

乔尔

Answer 1

解决了！！

通过在create方法中添加一行来解决：

 def create @power_plant_substrate = PowerPlantSubstrate.new(params[:power_plant_substrate]) # here I am setting the currency with what was sent in params @power_plant_substrate.currency = params[:power_plant_substrate][:currency] <=== this line ... end