Mongoid with के साथ तिथि के अनुसार समूह बनाने का सबसे अच्छा तरीका

यहां एक उत्तर दिया गया है जो तिथि के अनुसार समूह के लिए एकत्रीकरण ढांचे का उपयोग करता है। मुझे आशा है कि आपको यह पसंद आएगा।

ऐप/मॉडल/रोगी.आरबी

class Patient
  include Mongoid::Document
  field :name, type: String

  def self.group_by(field, format = 'day')
    key_op = [['year', '$year'], ['month', '$month'], ['day', '$dayOfMonth']]
    key_op = key_op.take(1 + key_op.find_index { |key, op| format == key })
    project_date_fields = Hash[*key_op.collect { |key, op| [key, {op => "$#{field}"}] }.flatten]
    group_id_fields = Hash[*key_op.collect { |key, op| [key, "$#{key}"] }.flatten]
    pipeline = [
        {"$project" => {"name" => 1, field => 1}.merge(project_date_fields)},
        {"$group" => {"_id" => group_id_fields, "count" => {"$sum" => 1}}},
        {"$sort" => {"count" => -1}}
    ]
    collection.aggregate(pipeline)
  end
end

टेस्ट/यूनिट/रोगी_टेस्ट.आरबी

require 'test_helper'
require 'pp'

class PatientTest < ActiveSupport::TestCase
  def setup
    Patient.delete_all
  end

  test "group by date" do
    [
        {"name" => "John", "created_at" => Date.new(2012, 10, 10).mongoize},
        {"name" => "Jane", "created_at" => Date.new(2012, 10, 31).mongoize},
        {"name" => "Mary", "created_at" => Date.new(2012, 10, 31).mongoize},
        {"name" => "Mark", "created_at" => Date.new(2012, 12, 12).mongoize},
        {"name" => "Alex", "created_at" => Date.new(2013, 11, 10).mongoize},
        {"name" => "Andy", "created_at" => Date.new(2013, 10, 31).mongoize},
        {"name" => "Toni", "created_at" => Date.new(2013, 10, 31).mongoize},
        {"name" => "Cori", "created_at" => Date.new(2013, 11, 10).mongoize}
    ].each do |patient|
      Patient.create(patient)
    end
    puts "\nMongoid::VERSION:#{Mongoid::VERSION}\nMoped::VERSION:#{Moped::VERSION}"
    pp Patient.group_by('created_at', 'month')
  end
end

$ रेक टेस्ट

Run options:

# Running tests:

[1/1] PatientTest#test_group_by_date
Mongoid::VERSION:3.1.5
Moped::VERSION:1.5.1
[{"_id"=>{"year"=>2012, "month"=>10}, "count"=>3},
 {"_id"=>{"year"=>2013, "month"=>10}, "count"=>2},
 {"_id"=>{"year"=>2013, "month"=>11}, "count"=>2},
 {"_id"=>{"year"=>2012, "month"=>12}, "count"=>1}]
Finished tests in 0.042561s, 23.4957 tests/s, 0.0000 assertions/s.
1 tests, 0 assertions, 0 failures, 0 errors, 0 skips