使用Rails5的属性API进行本地化输入的自定义Decimal类型

class LocalizedDecimalType < ActiveRecord::Type::Decimal
  def cast(value)
    if value.is_a?(String)
      value.gsub!(',', '.') # 将逗号替换为小数点，以适应本地化输入
    end
    super
  end
end

class Product < ApplicationRecord
  attribute :price, LocalizedDecimalType.new
end

<%= form_for @product do |f| %>
  <%= f.label :price %>
  <%= f.text_field :price %>
  <%= f.submit %>
<% end %>

class ProductsController < ApplicationController
  def create
    @product = Product.new(product_params)
    if @product.save
      redirect_to @product
    else
      render 'new'
    end
  end

  private

  def product_params
    params.require(:product).permit(:price)
  end
end