I\'ve fetched a number of ids through MapReduce. I\'ve sorted those ids by some criteria and now I need to get those objects in this particular order:
This question already has answers here: Mongo order by length of array (4 answers) Closed 8 years ago. Say i have a collection of answers where each answer contains an array of user_ids.
I have an object Message which is only ever created by this line: Message.find_or_create_by(:api_id => params[\'message_id\'])
I\'m building a card game (basic 52 card deck of playing cards 4 suits * 13 ranks), and I\'ve decided on MongoDB for this project.
Just wondering, if I index a field in mongoid is there a special query form I should be using to speed up queries using that 开发者_运维百科index or does Class.where(index: value) utilize that automat
Just wanted to ask some advice when building a database with mongodb, I have been reading a lot that if you have a database with a lot of joins it\'s better to go with say postgresql.
I am sure this is really simple, but I\'m missing something. This has always worked before. I\'m using Mongoid on Rails 3.1.
I have two Document Models that are proving problematic: class Component include Mongoid::Document include Mongoid::Versioning
I am writing a script with Ruby/MongoDB that stores Tweets. After I gem-installed mongoid, this first-steps code throws an error:
Mongoid::Paranoia adds a default scope to the model which generates the criteria #<Mongoid::Criteria
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