如何获取子ids的集合[Ruby on Rails 4.2]

Question

我是Ruby on Rails的新手。

我有两个模型。

class Experience < ActiveRecord::Base
   has_and_belongs_to_many: assets
end

class Assets < ActiveRecord::Base
   has_and_belongs_to_many: experiences
end

在我的体验控制器中，我尝试获取与体验关联的资产集合。(父子)

我目前正在使用will_paginate gem，并试图为此构建一个集合，以传递集合参数。

will_paginate(collection, options)

我该怎么做呢？

Answer 1

你的模型关系应该是：

class Experience < ActiveRecord::Base
   has_many: assets
end

class Assets < ActiveRecord::Base
  belongs_to: experience
end

在Experience Controller中，获取相关资源

# single experience data
@experience = Experience.first
@experience.assets


# multiple experiences data
@experiences = Experience.all.includes(:assets)

# you can also use this in view
@experiences.each do |x|
  x.assets.each do |a|
    a.title (ex. field name)
    ...
  end
end