使用Rails Gem Active Admin和关联

Question

我正在尝试新的Rails gem http://activeadmin.info/,它的工作效果很好!但是,我找不到任何关于如何跨关联使用它的文档.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

会员加入表还包括一些额外的数据(即:出勤).我正在尝试使用课程和学生名称显示成员资格 - 并允许对这些名称进行过滤/排序.据我所知,Active Admin不能跨关联工作.有没有其他人成功做到这一点,或发现另一个宝石呢？非常感谢!

Answer 1

ingredient.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

不要忘记加入表的迁移(:id为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