如何将给定的散列解析为轨道上的ruby所需的输出？

Question

我必须向用户发送每日课程更新通知。更新通知包含四种类型的[:due,:missed,:over_due,:new]。为了方便起见，我省略了不必要的数据字段，如过期和新格式一样。以下提供的数据属于用户。用户可以成为许多课程的一部分，这就是为什么2个不同的course_id存在于散列（course_id 20和30）中的原因。 id代表特定课程中的assignment_id。 数据的实际格式是。

{ 
    1 => { #the 1st user 
    :new => { 
      1 => { 
      :id => 1, 
      :course_id =>20, 
      :course_name => "B" 
      }, 
      2 => { 
      :id => 2, 
      :course_id =>30, 
      :course_name => "A" 
     }, 
     3 => { 
      :id => 3, 
      :course_id =>20, 
      :course_name => "B" 
     } 
     } 
     :over_due => {}, #This is also having the same format as new 
     :missed => {}, #This is also having the same format as new 
     :due => {} #This is also having the same format as new 
    }, 
    2 => { #this is 2nd user 
     :new => {}, 
     :over_due => {}, 
     :missed => {}, 
     :due => {} 
    } 
    } 

想，这只是我为更加清晰和解释用户创建一个虚拟数据。

assignments = { 
    :new => { 
    1 => { 
     :id => 1, 
     :course_id => 20, 
     :name => "A" 
    }, 
    2 => { 
     :id => 2, 
     :course_id => 20, 
     :name=>"A" 
    }, 
    3 => { 
     :id => 3, 
     :course_id => 30, 
     :name=>"B" 
    } 
    }, 
    :over_due => { 
    4 => { 
     :id => 4, 
     :course_id => 20, 
     :name => "A" 
    }, 
    5 => { 
     :id => 5, 
     :course_id => 30, 
     :name => "B" 
    } 
    } 
} 

我的要求，数据解析成这种格式：下面为您的解决方案代码

{ 
    20 => { 
    :new => { 
     1 => { 
     :id => 1, 
     :course_id => 20, 
     :name=>"A" 
     }, 
     2 => { 
     :id => 2, 
     :course_id => 20, 
     :name => "B" 
     } 
    }, 
    :over_due => { 
     4 => { 
     :id => 4, 
     :course_id => 20, 
     :name => "E" 
     } 
    } 
    }, 
    30 => { 
    :new => { 
     3 => { 
     :id => 3, 
     :course_id => 30, 
     :name => "C" 
     } 
    }, 
    :over_due => { 
     5 => { 
     :id => 5, 
     :course_id => 30, 
     :name=>"F" 
     } 
    } 
    } 
} 

Answer 1

检查：

hash = {} 
assignments.each do |type,type_data| 
    type_data.each do |assignment_id,data| 
     course_id = data[:course_id] 
     hash[course_id] = {} if hash[course_id].nil? 
     hash[course_id][type]= {} if hash[course_id][type].nil? 
     hash[course_id][type][assignment_id] = data 
    end 
end 

输出：

{20=>{:new=>{1=>{:id=>1, :course_id=>20, :name=>"A"}, 2=>{:id=>2, :course_id=>20, :name=>"B"}}, :over_due=>{4=>{:id=>4, :course_id=>20, :name=>"E"}}}, 30=>{:new=>{3=>{:id=>3, :course_id=>30, :name=>"C"}}, :over_due=>{5=>{:id=>5, :course_id=>30, :name=>"F"}}}}