mongoid

来源： https://stackoverflow.com/questions/27950979/rails-mongoid-pluck-equivalent

来源： https://stackoverflow.com/questions/27950979/rails-mongoid-pluck-equivalent

来源： https://stackoverflow.com/questions/31193495/error-original-error-imagemagick-graphicsmagick-is-not-installed

来源： https://stackoverflow.com/questions/31193495/error-original-error-imagemagick-graphicsmagick-is-not-installed

问题 I'm trying to open my MongoDB models, however, I'm getting the following error: MONGODB | xxx.xx.x.xxx:27017 | db.find | FAILED | wrong number of arguments (given 2, expected 1) | 0.013306s My Mongo credentials are correct, and I can connect to the database's collections outside of Rails. The first few lines of the error are: Started GET "/admin/xsl_sheet" for xxx.xxx.xxx.xxx at 2020-03-03 13:49:54 UTC Processing by RailsAdmin::MainController#index as HTML Parameters: {"model_name"=>"xsl

问题 I'm trying to open my MongoDB models, however, I'm getting the following error: MONGODB | xxx.xx.x.xxx:27017 | db.find | FAILED | wrong number of arguments (given 2, expected 1) | 0.013306s My Mongo credentials are correct, and I can connect to the database's collections outside of Rails. The first few lines of the error are: Started GET "/admin/xsl_sheet" for xxx.xxx.xxx.xxx at 2020-03-03 13:49:54 UTC Processing by RailsAdmin::MainController#index as HTML Parameters: {"model_name"=>"xsl

问题 This model: class SimCustomer < Customer index({ user_id: 1 }, { background: true }) belongs_to :user, :inverse_of => :sim_customers end inherits from this model: class Customer include Mongoid::Document include Mongoid::Timestamps field :mail_address, type: String end I create the indexes from my terminal: bundle exec rake db:mongoid:create_indexes But this creates indexes on the Customer instead of the SimCustomer : I, [2014-11-13T16:21:17.210343 #11407] INFO -- : MONGOID: Created indexes

问题 This model: class SimCustomer < Customer index({ user_id: 1 }, { background: true }) belongs_to :user, :inverse_of => :sim_customers end inherits from this model: class Customer include Mongoid::Document include Mongoid::Timestamps field :mail_address, type: String end I create the indexes from my terminal: bundle exec rake db:mongoid:create_indexes But this creates indexes on the Customer instead of the SimCustomer : I, [2014-11-13T16:21:17.210343 #11407] INFO -- : MONGOID: Created indexes

问题 It's common practice in MongoDB to use short key names to save space. For example, one might want to use "fn" instead of "first_name" However in your app, you're screwed if you use "fn" all over the place. It's too ugly. For Rails specifically, is there an easy way to specify an alias when declaring a field in Mongoid? Also, does anyone know of any open source sample projects that use Mongoid? Thanks! 回答1: you should consider using field :fn, :as => :firstname as outlined here: http://groups

问题 I have a rake task that processes a set of records and saves it in another collection: batch = [] Record.where(:type => 'a').each do |r| batch << make_score(r) if batch.size %100 == 0 Score.collection.insert(batch) batch = [] end end I'm processing about 100K records at a time. Unfortunately at 20 minutes, I get a Query response returned CURSOR_NOT_FOUND error. The mongodb faq says to use skip and limit or turn off timeouts, using them the all thing was about ~2-3 times slower. How can I turn