導軌軌道錢未定義的方法`仙

我試圖實現貨幣軌和我遇到了以下錯誤：導軌軌道錢未定義的方法`仙

undefined method `cents' for "1,000.00":String

我跟着this tutorial得到一個‘神奇’的貨幣輸入字段。

DB模式：

t.integer "balance_cents", default: 0,  null: false 
t.string "balance_currency", default: "USD", null: false

型號：

monetize :balance_cents, as: :balance, allow_nil: :true, :numericality => { :greater_than_or_equal_to => 0} 

def initialize(attributes = {}) 
    super 
    @balance = attributes[:balance] 
end

形式：

<%= form_for(@asset, url: assets_new_path) do |f| %> 
    <%= f.label :balance, "Balance/Value ($)" %> 
    <%= f.number_field :balance, data: { role: 'money', a_sep: ',', a_dec: '.' }, class: 'form-control' %>

控制器：

def create 
    @asset = Asset.new(asset_params) 
    if @asset.save 
    flash[:success] = "New asset created successfully." 
    redirect_to assets_path 
    else 
    ... 
    end 
end 

def asset_params 
    params.require(:asset).permit(:balance) 
end

我是否應該設置另一個（更好）方式的平衡輸入字段？

來源

2016-11-22 CChandler81