Question

我有两个mongoid文档Class1和Class2，都有subject字段现在我可以按照这个

的主题从个别类组中获得结果

@class1_subject = Class1.all.group_by {|s| s.subject }

@class2_subject = Class2.all.group_by {|s| s.subject }

现在@ class1_subject包含=＆gt;

{
  "algebra" => [
    #<Class1 _id: 51af35f4066104e046000003, name: "root", subject: "algebra">
  ],
  "algebra-II" => [
    #<Class1 _id: 51af3da0066104f448000003, name: "roo2", subject: "algebra-II">
  ]
}

和@ class2_subject包含=＆gt;

{
  "algebra" => [
    #<Class2 _id: 51af07d606610423e7000002,.........,subject: "algebra">
  ]
}

结合后，我期待这个结果

{
  "algebra" => [
    #<Class1 _id: 51af35f4066104e046000003,name: "root", subject: "algebra">,
    #<Class2 _id: 51af07d606610423e7000002,.........,subject: "algebra">
  ],
  "algebra-II" => [
    #<Class1 _id: 51af3da0066104f448000003, name: "roo2", subject: "algebra-II">
   ]
}

我该怎么做？

Answer 1

这可以是近似值：

@class1_subject.keys.each do |key|
  @class2_subject[key] ||= []
  @class2_subject[key] += @class1_subject[key]
end

@ class2_subject现在有结果

结合mongoid结合

1 个答案: