Question

我有三种模式：文化，自然和历史。

我还有一个包含用户搜索标准的数组：

["nature", "culture", "history"]

当然，这个数组可能只包含一个或两个标准（例如＆＃34;自然和文化＆＃34;或只是＆＃34;自然＆＃34;等等）

根据这个数组，我想查询相应的模型并将结果呈现在一个唯一的集合中。

我尝试了很多东西，例如：

 @sites = Culture.where(:coordinates => {"$ne" => "", "$ne" => nil} )

if array_type_sites.include?("nature")
      @sitesNature = Nature.where(:coordinates => {"$ne" => "", "$ne" => nil} )
      @sites << @sitesNature
 end
 if array_type_sites.include?("culture")
       @sitesCulture = Culture.where(:coordinates => {"$ne" => "", "$ne" => nil} )
       @sites << @sitesCulture
end  

return @sites

在此代码中，@sites未使用@sitesCulture实施，仅适用于@sitesNature。

让这项工作最好的方法是什么？

Answer 1

你试过Mongoid中的继承吗？ http://mongoid.org/en/mongoid/docs/documents.html#inheritance

以下测试执行我认为您想要做的事情，包括文化，历史和自然对象存储和从保留类型的集合中获取。我希望你觉得这很有用。

应用程序/模型/兴趣

class Interest
  include Mongoid::Document
  field :description, type: String
  field :coordinates, type: String
end

应用程序/模型/文化

class Culture < Interest; end

应用程序/模型/历史

class History < Interest; end

应用程序/模型/性质

class Nature < Interest; end

测试/单元/ interest_test.rb

require 'test_helper'
require 'pp'

class InterestTest < ActiveSupport::TestCase
  def setup
    Interest.delete_all
    Culture.delete_all
    History.delete_all
    Nature.delete_all
  end

  test "version" do
    puts "\nMongoid::VERSION:#{Mongoid::VERSION}\nMoped::VERSION:#{Moped::VERSION}"
  end
  test "inheritance" do
    Culture.create(description: "a culture site", coordinates: "40.7577° N, 73.9857° W")
    History.create(description: "a history site", coordinates: "40.7577° N, 73.9857° W")
    Nature.create(description: "a nature site", coordinates: "40.7577° N, 73.9857° W")

    array_type_sites = ["nature", "culture", "history"]
    @sites = Culture.where(:coordinates => {"$ne" => "", "$ne" => nil} ).to_a

    if array_type_sites.include?("nature")
      @sitesNature = Nature.where(:coordinates => {"$ne" => "", "$ne" => nil} ).to_a
      @sites += @sitesNature
    end
    if array_type_sites.include?("culture")
      @sitesCulture = Culture.where(:coordinates => {"$ne" => "", "$ne" => nil} ).to_a
      @sites += @sitesCulture
    end

    Interest.collection.insert(@sites.collect{|site|site.serializable_hash})
    puts
    pp Interest.all.to_a
  end
end

rake test

Run options:

# Running tests:

[1/2] InterestTest#test_inheritance
[#<Culture _id: 53dfd43b7f11ba43ef000001, description: "a culture site", coordinates: "40.7577° N, 73.9857° W", _type: "Culture">,
 #<History _id: 53dfd43b7f11ba43ef000002, description: "a history site", coordinates: "40.7577° N, 73.9857° W", _type: "History">,
 #<Nature _id: 53dfd43b7f11ba43ef000003, description: "a nature site", coordinates: "40.7577° N, 73.9857° W", _type: "Nature">]
[2/2] InterestTest#test_version
Mongoid::VERSION:3.1.6
Moped::VERSION:1.5.2
Finished tests in 0.084751s, 23.5985 tests/s, 0.0000 assertions/s.
2 tests, 0 assertions, 0 failures, 0 errors, 0 skips

ruby -v: ruby 2.1.1p76 (2014-02-24 revision 45161) [x86_64-darwin12.0]

Rails / MongoId - 使用条件标准在多个模型上连接多个查询

1 个答案: