在MongoMapper中更新/銷燬EmbeddedDocuments

Question

我似乎無法弄清楚如何更新或銷燬MongoMapper中的EmbeddedDocuments。通過谷歌搜索我已經看到不同的方法，如delete_if {}和其他，但似乎沒有任何語義工作。 MongoMapper有什麼內置的幫助嗎？

class Schedule 
    include MongoMapper::Document 

    key :name, String 
    key :description, String 
    key :active, Boolean, :default => false 

    many :periods 

    validates_presence_of :name 

    def activate! 
    set({:active => true}, :active => false) 

    self.active = true 
    end 
end 

class Period 
    include MongoMapper::EmbeddedDocument 

    key :number, Integer 
    key :text, String 
    key :start, Time 
    key :finish, Time 

    embedded_in :schedule 

    before_validation :number! 

    validates_presence_of :number 
    validates_presence_of :text 
    validates_presence_of :start 
    validates_presence_of :finish 

    validates_format_of :start, :with => /^(2[0-3]|[01]?[0-9]):([0-5]?[0-9])$/ 
    validates_format_of :finish, :with => /^(2[0-3]|[01]?[0-9]):([0-5]?[0-9])$/ 

    def number! 
    unless self.number 
     number = schedule.periods.count + 1 
    end 
    end 
end 

Answer 1

後續測試顯示瞭如何更新和以兩種方式除去嵌入的文檔的例子： （1）經由紅寶石使用標準陣列存取和方法，並且 （2）經由蒙戈（MongoMapper/MongoDB的），用於更新和DB服務器上移除嵌入文檔的

參考文獻：

http://www.ruby-doc.org/core-1.9.3/Array.html#method-i-delete_if 
http://mongomapper.com/documentation/plugins/modifiers.html#set 
http://www.mongodb.org/display/DOCS/Updating#Updating-%24set 

請注意，包含哈希鍵「」需要使用舊的（=>）語法。希望這有助於。

測試/單元/ period_test.rb

require 'test_helper' 

def ppp(obj) 
    puts obj.inspect.gsub(/(, |\[)#/, "\\1\n #") 
end 

class PeriodTest < ActiveSupport::TestCase 
    def setup 
    Schedule.delete_all 
    @today = Time.now.midnight 
    end 

    test "update and remove embedded documents" do 
    schedule = Schedule.create(name: 'George') 
    assert_equal(1, Schedule.count) 
    schedule.periods << Period.new(number: 1, text: 'period 1', start: @today + 8.hours, finish: @today + 9.hours) 
    schedule.periods << Period.new(number: 2, text: 'period 2', start: @today + 9.hours, finish: @today + 10.hours) 
    schedule.periods << Period.new(number: 3, text: 'period 3', start: @today + 10.hours, finish: @today + 11.hours) 
    schedule.periods.last.finish = @today + 12.hours #update in Ruby 
    schedule.save 
    assert_equal(1, Schedule.count) 
    puts "schedule with three periods --------" 
    ppp Schedule.first 
    schedule.periods.delete_if {|period| period.text == 'period 2'} #remove in Ruby 
    schedule.save 
    puts "schedule after removing period 2 in Ruby --------" 
    ppp Schedule.first 
    Schedule.set({name: 'George', 'periods.text' => 'period 1'}, {'periods.$.finish' => @today + 10.hours}) #update embedded document in MongoDB 
    puts "schedule after updatting period 1 via Mongo --------" 
    ppp Schedule.first 
    Schedule.pull({name: 'George'}, { periods: { text: 'period 1'} }) #remove embedded document in MongoDB 
    puts "schedule after pulling period 1 via Mongo --------" 
    ppp Schedule.first 
    end 
end 

輸出

Run options: --name=test_update_and_remove_embedded_documents 

# Running tests: 

schedule with three periods -------- 
#<Schedule _id: BSON::ObjectId('4ff732e77f11ba6fe9000001'), active: false, name: "George", periods: [ 
#<Period _id: BSON::ObjectId('4ff732e77f11ba6fe9000002'), finish: Fri, 06 Jul 2012 13:00:00 UTC +00:00, number: 1, start: Fri, 06 Jul 2012 12:00:00 UTC +00:00, text: "period 1">, 
#<Period _id: BSON::ObjectId('4ff732e77f11ba6fe9000003'), finish: Fri, 06 Jul 2012 14:00:00 UTC +00:00, number: 2, start: Fri, 06 Jul 2012 13:00:00 UTC +00:00, text: "period 2">, 
#<Period _id: BSON::ObjectId('4ff732e77f11ba6fe9000004'), finish: Fri, 06 Jul 2012 16:00:00 UTC +00:00, number: 3, start: Fri, 06 Jul 2012 14:00:00 UTC +00:00, text: "period 3">]> 
schedule after removing period 2 in Ruby -------- 
#<Schedule _id: BSON::ObjectId('4ff732e77f11ba6fe9000001'), active: false, name: "George", periods: [ 
#<Period _id: BSON::ObjectId('4ff732e77f11ba6fe9000002'), finish: Fri, 06 Jul 2012 13:00:00 UTC +00:00, number: 1, start: Fri, 06 Jul 2012 12:00:00 UTC +00:00, text: "period 1">, 
#<Period _id: BSON::ObjectId('4ff732e77f11ba6fe9000004'), finish: Fri, 06 Jul 2012 16:00:00 UTC +00:00, number: 3, start: Fri, 06 Jul 2012 14:00:00 UTC +00:00, text: "period 3">]> 
schedule after updatting period 1 via Mongo -------- 
#<Schedule _id: BSON::ObjectId('4ff732e77f11ba6fe9000001'), active: false, name: "George", periods: [ 
#<Period _id: BSON::ObjectId('4ff732e77f11ba6fe9000002'), finish: Fri, 06 Jul 2012 14:00:00 UTC +00:00, number: 1, start: Fri, 06 Jul 2012 12:00:00 UTC +00:00, text: "period 1">, 
#<Period _id: BSON::ObjectId('4ff732e77f11ba6fe9000004'), finish: Fri, 06 Jul 2012 16:00:00 UTC +00:00, number: 3, start: Fri, 06 Jul 2012 14:00:00 UTC +00:00, text: "period 3">]> 
schedule after pulling period 1 via Mongo -------- 
#<Schedule _id: BSON::ObjectId('4ff732e77f11ba6fe9000001'), active: false, name: "George", periods: [ 
#<Period _id: BSON::ObjectId('4ff732e77f11ba6fe9000004'), finish: Fri, 06 Jul 2012 16:00:00 UTC +00:00, number: 3, start: Fri, 06 Jul 2012 14:00:00 UTC +00:00, text: "period 3">]> 
. 

Finished tests in 0.038952s, 25.6726 tests/s, 51.3452 assertions/s. 

1 tests, 2 assertions, 0 failures, 0 errors, 0 skips