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我是Ruby on Rails的新手。我在一個月前開始在RoR工作。我的問題是:Ruby on Rails中的動態選擇標記
如何製作動態選擇標籤,通過AJAX根據產品型號的選定顏色顯示尺寸?
每個產品都有很多變體。每種變體都有一種顏色,一種尺寸和數量。
這裏是我的模型:
class Color < ActiveRecord::Base
has_many :variants, dependent: :destroy
validates :name, presence: true, length: {minimum: 2, maximum: 20}
validates :hex, presence: true, uniqueness: true, length: { is: 7}, format: { with: /\A#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})\z/ }
end
class Size < ActiveRecord::Base
has_many :variants, dependent: :destroy
validates :size, uniqueness: true, numericality: { only_integer: true, greater_than_or_equal_to: 28, less_than_or_equal_to: 49}
end
class Variant < ActiveRecord::Base
belongs_to :product
belongs_to :size
belongs_to :color
validates :quantity, :numericality => { :greater_than_or_equal_to => 0 }
validates :color_id, presence: true
validates :size_id, presence: true
end
這裏是我的產品的看法:
<%= form_tag({controller: "carts", action: "add"}, method: "post", class: "form") do %>
Color:
<%= select_tag :color, options_from_collection_for_select(@colors, "name", "name"), id: 'color', prompt: 'Select color', onchange: 'onChange()' %>
Quantity:
<%= number_field_tag :quantity, '1', min: 1%>
Size:
<%= select_tag :size, options_from_collection_for_select(@sizes,"size", "size"), id: 'size', prompt: 'Select size', onchange: 'onChange()'%>
<%= submit_tag "ADD TO CART", class: 'btn btn-default' %>
<%= submit_tag "BUY NOW", class: 'btn btn-dark-grey', style: "margin-left:10px"%>
<% end %>
我會提供更多的信息,如果它是需要的。提前致謝。