Ruby ActiveAdmin计算

我想对我的管理界面进行一些计算，所以我有一个产品资源，在这个资源中，您可以看到我所做的服务列表，例如喷枪，应用程序的价格被视为（1美元/1平方厘米）

我怎样才能更好地实现这个想法

我希望看到，当用户按下按钮“New Product”（新产品）时，它是一个字段，他在该字段中写入平方厘米的数量，并根据这些尺寸，自动以货币呈现所需的金额

---

Rails 4.1.0

ActiveAdmin 1.0.0

ruby 2.1

---

刚才你只能输入一个固定价格，比如一个产品/服务的固定价格

app/admin/product.rb

ActiveAdmin.register Product, { :sort_order => :name_asc } do

    # Scopes
    scope :all, :default => true
    scope :available do |products|
        products.where("available < ?", Date.today)
    end
    scope :drafts do |products|
        products.where("available > ?", Date.today)
    end
    scope :featured_products do |products|
        products.where(:featured => true)
    end

    # Permitted parameters
    permit_params :article_id, :title, :description, :price, :featured, :available, :image_file_name

    # Displayed columns
    index do
    selectable_column
        column :article,  :sortable => :article
        column :title,    :sortable => :title
        column :description
    # Currency helper
        column :price, :sortable => :price do |cur|
            number_to_currency cur.price, locale: :ru
        end
        column :featured
        column :available
    #   column :image_file_name
        actions
    end

    # Product details
    show do
        panel "Product Details" do
            attributes_table_for product do
                row("Article")           { link_to product.article }
                row("Title")             { product.title }
                row("Description")       { product.description }
                row("Price")             { product.price }
                row("Featured")          { product.featured }
                row("Available on")      { product.available }
                row("Image")             { image_tag("products/" + product.image_file_name) }
            end
        end
    end
    # Filters
    filter :article,      :as => :select
    filter :title,        :as => :select               # :check_boxes (for checkboxes)
    filter :price,        :as => :select
    filter :available,    :as => :select
    filter :featured,     :as => :check_boxes
end

class Product < ActiveRecord::Base

    # Relationship
    belongs_to :article

    # Named Scopes
    scope :available, lambda{ where("available < ?", Date.today) }
    scope :drafts,    lambda{ where("available > ?", Date.today) }

    # Validations
    validates :article, :title, :description, :price, :available, :presence => true
    validates :featured, :inclusion => { :in => [true, false] }
end

class Article < ActiveRecord::Base

    # Relationship
    has_many :products, :dependent => :delete_all

    # Validations
    validates :title, :description, :presence => true

    # Define for display a article for products as article code
    def to_s
        "#{title}"
    end
end

ActiveAdmin.register产品，{:sort\u order=>：name\u asc}do
#范围
作用域：all，：default=>true
经营范围：现有do |产品|
产品。如有（“可用”，日期：今天）
结束
经营范围：产品|
产品。在哪里（“可用>？”，日期。今天）
结束
经营范围：特色|产品做|产品|
产品。其中（：featured=>true）
结束
#允许参数
许可参数：文章id，：标题，：描述，：价格，：特色，：可用，：图像\u文件\u名称
#显示列
索引do
可选列
列：article，：sortable=>：article
列：title，：sortable=>：title
栏目：说明
#货币助手
列：price，：sortable=>：price do | cur|
数字到货币当前价格，地区：：ru
结束
专栏：特色
专栏：可用
#列：图像\文件\名称
行动
结束
#产品详情
表演
“产品详细信息”面板
产品do的属性\u表\u
行（“文章”）{link_to product.Article}
行（“标题”）{product.Title}
行（“说明”）{product.Description}
行（“价格”）{product.Price}
行（“特色”）{product.Featured}
行（“在上可用”）{product.Available}
行（“图像”）{Image_标记（“products/”+product.Image_文件名）}
结束
结束
结束
#过滤器
过滤器：文章，：as=>：选择
筛选器：title，：as=>：选择#：复选框（用于复选框）
过滤器：价格，：as=>：选择
过滤器：可用，：as=>：选择
过滤器：特色，：as=>：复选框
结束

app/models/product.rb

ActiveAdmin.register Product, { :sort_order => :name_asc } do

    # Scopes
    scope :all, :default => true
    scope :available do |products|
        products.where("available < ?", Date.today)
    end
    scope :drafts do |products|
        products.where("available > ?", Date.today)
    end
    scope :featured_products do |products|
        products.where(:featured => true)
    end

    # Permitted parameters
    permit_params :article_id, :title, :description, :price, :featured, :available, :image_file_name

    # Displayed columns
    index do
    selectable_column
        column :article,  :sortable => :article
        column :title,    :sortable => :title
        column :description
    # Currency helper
        column :price, :sortable => :price do |cur|
            number_to_currency cur.price, locale: :ru
        end
        column :featured
        column :available
    #   column :image_file_name
        actions
    end

    # Product details
    show do
        panel "Product Details" do
            attributes_table_for product do
                row("Article")           { link_to product.article }
                row("Title")             { product.title }
                row("Description")       { product.description }
                row("Price")             { product.price }
                row("Featured")          { product.featured }
                row("Available on")      { product.available }
                row("Image")             { image_tag("products/" + product.image_file_name) }
            end
        end
    end
    # Filters
    filter :article,      :as => :select
    filter :title,        :as => :select               # :check_boxes (for checkboxes)
    filter :price,        :as => :select
    filter :available,    :as => :select
    filter :featured,     :as => :check_boxes
end

class Product < ActiveRecord::Base

    # Relationship
    belongs_to :article

    # Named Scopes
    scope :available, lambda{ where("available < ?", Date.today) }
    scope :drafts,    lambda{ where("available > ?", Date.today) }

    # Validations
    validates :article, :title, :description, :price, :available, :presence => true
    validates :featured, :inclusion => { :in => [true, false] }
end

class Article < ActiveRecord::Base

    # Relationship
    has_many :products, :dependent => :delete_all

    # Validations
    validates :title, :description, :presence => true

    # Define for display a article for products as article code
    def to_s
        "#{title}"
    end
end

类产品？”，Date.today）}
#验证
验证：article、：title、：description、：price、：available、：presence=>true
验证：特征，：包含=>{:in=>[true，false]}
结束

app/models/article.rb

ActiveAdmin.register Product, { :sort_order => :name_asc } do

    # Scopes
    scope :all, :default => true
    scope :available do |products|
        products.where("available < ?", Date.today)
    end
    scope :drafts do |products|
        products.where("available > ?", Date.today)
    end
    scope :featured_products do |products|
        products.where(:featured => true)
    end

    # Permitted parameters
    permit_params :article_id, :title, :description, :price, :featured, :available, :image_file_name

    # Displayed columns
    index do
    selectable_column
        column :article,  :sortable => :article
        column :title,    :sortable => :title
        column :description
    # Currency helper
        column :price, :sortable => :price do |cur|
            number_to_currency cur.price, locale: :ru
        end
        column :featured
        column :available
    #   column :image_file_name
        actions
    end

    # Product details
    show do
        panel "Product Details" do
            attributes_table_for product do
                row("Article")           { link_to product.article }
                row("Title")             { product.title }
                row("Description")       { product.description }
                row("Price")             { product.price }
                row("Featured")          { product.featured }
                row("Available on")      { product.available }
                row("Image")             { image_tag("products/" + product.image_file_name) }
            end
        end
    end
    # Filters
    filter :article,      :as => :select
    filter :title,        :as => :select               # :check_boxes (for checkboxes)
    filter :price,        :as => :select
    filter :available,    :as => :select
    filter :featured,     :as => :check_boxes
end

class Product < ActiveRecord::Base

    # Relationship
    belongs_to :article

    # Named Scopes
    scope :available, lambda{ where("available < ?", Date.today) }
    scope :drafts,    lambda{ where("available > ?", Date.today) }

    # Validations
    validates :article, :title, :description, :price, :available, :presence => true
    validates :featured, :inclusion => { :in => [true, false] }
end

class Article < ActiveRecord::Base

    # Relationship
    has_many :products, :dependent => :delete_all

    # Validations
    validates :title, :description, :presence => true

    # Define for display a article for products as article code
    def to_s
        "#{title}"
    end
end

类文章：全部删除
#验证
验证：title、：description、：presence=>true
#定义将产品的项目显示为项目代码
def至美国
“#{title}”
结束
结束

用户输入维度后，是否要在表单页面上显示价格？在保存之前？