ruby-on-rails-3 - 将 Rails Gem Active Admin 与关联一起使用

Question

我正在尝试新的 Rails gem http://activeadmin.info/而且效果很好!但是，我找不到有关如何跨协会使用它的任何文档。例如:

class Membership < ActiveRecord::Base
  belongs_to :course
  belongs_to :person

class Course < ActiveRecord::Base
  has_many :memberships
  has_many :people,  :through => :memberships

class Person < ActiveRecord::Base
  has_many :memberships
  has_many :courses, :through => :memberships

成员连接表还包括一些额外的数据(即:出勤率)。我正在尝试同时显示类(class)和学生姓名的成员资格 - 并允许对这些姓名进行过滤/排序。据我发现，Active Admin 不能跨关联工作。有没有其他人成功地做到了这一点，或者找到了另一个可以做到的 gem ？非常感谢!

Answer 1

成分.rb

class Ingredient < ActiveRecord::Base
has_and_belongs_to_many :products, :join_table => :ingredients_products
end

product.rb

class Product < ActiveRecord::Base
  has_and_belongs_to_many :ingredients, :join_table => :ingredients_products
end

不要忘记连接表的迁移(:id 到 false!)

class CreateProductsIngredients < ActiveRecord::Migration
  def self.up
    create_table :ingredients_products,:id => false do |t|
      t.integer :product_id
      t.integer :ingredient_id
      t.timestamps
    end
  end

  def self.down
    drop_table :products_ingredients
  end
end

现在在您的 ActiveAdmin 资源中定义表单，覆盖默认值

ActiveAdmin.register Product do
  form do |f|
        f.inputs "Details" do
          f.input :product_name
          f.input :brand
          f.input :ingredients # don't forget this one!
        end
end