mongoid

问题 I have a document in MongoDB that looks like this: { users: ["2", "3", "4"] } I'm try to query this document by matching the users array. db.things.find( { users: { $all: [ "2", "3", "4" ] } } ) That query works, but would also return this document: { users: ["2", "3", "4", "5"] } Last requirement is to be able to query the users array with the elements out of order, say [ "3", "4", "2" ] in the query, and it be able to return my first document listed. Any help would be greatly appreciated.

问题 In Mongoid, pushing a document into an embeds_many relation automatically persists the document to the database. Normally, this is fine, but I run into problems when I need to track changes to the embedded document. Say you have two models: class List include Mongoid::Document embeds_many :items field :title end class Item include Mongoid::Document embedded_in :list field :name end This happens to the .changes attribute: list = List.new(title: 'List title') list.save #list is now persisted

问题 I am trying to use a covering index to implement stemming text search on my app which uses mongodb. I've got the following index set: ensureIndex({st: 1, n: 1, _id: 1}); But when I run explain() on my query, I can never get the indexOnly to read true, no matter what I do. db.merchants.find({st: "Blue"}, {n:1,_id:1}).explain() { "cursor" : "BtreeCursor st_1_n_1__id_1", "nscanned" : 8, "nscannedObjects" : 8, "n" : 8, "millis" : 0, "nYields" : 0, "nChunkSkips" : 0, "isMultiKey" : true,

问题 I can't find any blog post or documentation talking about this. They both, embedded document and hash data type, are quite similar. What the benefit or limitation of each over the other? Consider my schema design: class HistoryTracker include ::Mongoid::Document include ::Mongoid::Timestamps field :modifier, type: Hash, default: {} field :original, type: Hash, default: {} field :modified, type: Hash, default: {} field :changeset, type: Hash, default: {} end Should I create several embedded

问题 How do you enable SSL/TLS in the Mongoid 3 client? I've tried: options: -ssl: true But I get "undefined method `each_pair' for [{"ssl"=>true}]:Array (NoMethodError)": /home/user1/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/bundler/gems/mongoid-026e32109178/lib/mongoid/config.rb:203:in `options=': undefined method `each_pair' for [{"ssl"=>true}]:Array (NoMethodError) from /home/jwiley/.rbenv/versions/2.0.0-p451/lib/ruby/gems/2.0.0/bundler/gems/mongoid-026e32109178/lib/mongoid/config.rb:129

问题 I want to limit the number of associated objects in a has_many association between a post and pictures : In active record i can do something like class post < < ActiveRecord::Base has_many :pictures, :limit => 2 end But mongoid raise an exception with limit: Invalid option :limit provided to relation :pictures. Valid options are: as, autosave, dependent, foreign_key, order, class_name, extend, inverse_class_name, inverse_of, name, relation, validate. (Mongoid::Errors::InvalidOptions) Is there

问题 I've a User model embedding "one to many" Watchlists like the following : class User include Mongoid::Document field :uid field :name field :user_hash embeds_many :watchlists end class Watchlist include Mongoid::Document field :html_url field :description #field :name field :fork_, :type => Boolean field :forks, :type => Integer field :watchers, :type => Integer field :created_at, :type => DateTime field :pushed_at, :type => DateTime field :avatar_url embedded_in :user has_and_belongs_to_many

问题 I have the following models inside a Rails application: class User include Mongoid::Document ... end class Admin < User ... end I get a user: u = User.find(some_key) And try to change the _type: u._type # => "User" u._type = "Admin" u.save u._type # => "Admin" But if I reload the object it's still a user: u.reload u._type = "User" What is the correct way to change this? 回答1: you could also use Model#update_attribute to stay with mongoid: user.update_attribute(:_type, "Admin") 回答2: Ended up

问题 When querying on a certain model in my rails application, it returns the correct results, excerpt the size , length or count information, even using the limit criteria. recipes = Recipe .where(:bitly_url => /some.url/) .order_by(:date => :asc) .skip(10) .limit(100) recipes.size # => 57179 recipes.count # => 57179 recipes.length # => 57179 I can't understand why this is happening, it keeps showing the total count of the recipes collection, and the correct value should be 100 since I used limit

问题 I have this query: User.or( { name: 'John' }, { name: 'Sara' } ).or( { age: 17 }, { age: 18 } ) ) It returns the next Criteria: #<Mongoid::Criteria selector: {"enabled"=>true, "$or"=>[{"name"=>"John"}, {"name"=>"Anoun"}, {"age"=>17}. {"age"=>18}]} options: {} class: User embedded: false> But I want to do 'and' betweend two 'or' that return something like this: #<Mongoid::Criteria selector: {"enabled"=>true, "$and"=>[ {"$or"=>[{"name"=>"John"}, {"name"=>"Anoun"}]}, {"$or"=>[{"age"=>17}, {"age"