Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>You can use the MongoDB group command to do some server-size processing on a single collection, and it is available as a method on the collection in the Ruby driver, see <a href="http://api.mongodb.org/ruby/current/Mongo/Collection.html#group-instance_method" rel="nofollow">http://api.mongodb.org/ruby/current/Mongo/Collection.html#group-instance_method</a></p> <p>Below please find a test based on your models, with the title field added to your Game model. This is a working answer to your question that uses MongoDB's group command.</p> <pre><code>require 'test_helper' class GameTest &lt; ActiveSupport::TestCase def setup Player.delete_all Game.delete_all end test "game player count" do input = [ [ 'diablo_3', 89 ], [ 'max_payne_3', 87 ], [ 'world_of_warcraft', 65 ], [ 'dirt_3', 43 ] ] input.shuffle.each do | title, count | game = Game.create(title: title) (0...count).each{ game.players &lt;&lt; Player.new } end game_player_count = Game.collection.group(key: :_id, cond: {}, initial: {count: 0}, reduce: 'function(doc, out) { out.title = doc.title; out.count = doc.player_ids.length; }') game_player_count.sort!{|a,b| -(a['count'] &lt;=&gt; b['count']) } game_player_count = Hash[*game_player_count.map{|r| [r['title'], {"players" =&gt; r['count'].to_i} ]}.flatten] puts JSON.pretty_generate(game_player_count) end end </code></pre> <p>result</p> <pre><code>Run options: --name=test_game_player_count # Running tests: { "diablo_3": { "players": 89 }, "max_payne_3": { "players": 87 }, "world_of_warcraft": { "players": 65 }, "dirt_3": { "players": 43 } } . Finished tests in 0.482286s, 2.0735 tests/s, 0.0000 assertions/s. 1 tests, 0 assertions, 0 failures, 0 errors, 0 skips </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POHow To Count The Occurrence Of A Referenced Model In MongoDB/Mongoid
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USGary Murakami
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POHow To Count The Occurrence Of A Referenced Model In MongoDB/Mongoid
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COThanks Gary. I'll test your snippet on my side. :-)
      singulars
      1. PO
      1. USBen
    2. COThanks Gary for the help.
      singulars
      1. PO
      1. USBen
    3. COGlad to be of help. Hope that you are enjoying Mongoid/MongoDB.
      singulars
      1. PO
      1. USGary Murakami
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload