mongomapper

Is it possible to use MongoMapper in application that stores its models in many databases? For example I have separated database for Users and another one for Orders and I want to model both User and Order using MongoMapper. Of course I can switch MongoMapper.connection attribute but it is potentially unsafe due to race condition. You can set the connection per model: User.connection(Mongo::Connection.new('localhost', 27017)) 来源： https://stackoverflow.com/questions/6751568/mongomapper-and-more-than-one-databases-in-application

I have a Record model (Active Record) that stores some custom logs. Record is in polymorphic association with all the other model in my app, and I can effectively log what I want hooking my Record methods in the other controllers. What I need: To have the logs in a separate database. So I have to: Be able to manage two different databases in my apllication (one is Postgres/ActiveRecord and the other one is MongoDB/MongoMapper) Generate a polymorphic association between my Record model, now with MongoMapper, and the rest of my Active Record models. That way I can persist my logs to the MongoDB

I have a query like this: @allJobs = Job.where(:merchant_id => session[:admin_id].to_s).sort(:start_date.desc).limit(100) When I run .count on this I get: jobs count 1720 I expect to see : jobs count 100 What am I doing wrong? If I try to run Job.all(query).limit(100) I get "undefined method limit for Array #foo" It seems there is no way I can get the results to restrict to 100 records sorted in descending order by start_date! UPDATE: I cannot even do something simple like this: @allJobs = Job.limit(100) Rails.logger.info("@allJobs count is " + @allJobs.count.to_s) Console: @allJobs count is

how to use filter data as sql do "LIKE" in MongoDB, instead I using gem mongomapper on my rails apps? .thanks If you're looking for partial matches on a string you can query with a regular expression. Here's the relevant part of the mongomapper docs: http://api.mongodb.org/ruby/current/file.TUTORIAL.html#Querying_with_Regular_Expressions Worth noting this from the Mongodb docs: "For simple prefix queries (also called rooted regexps) like /^prefix/, the database will use an index when available and appropriate (much like most SQL databases that use indexes for a LIKE 'prefix%' expression). This

I am new to mongodb/mongomapper and can't find an answer to this. I have a mongomapper class with the following fields key :author_id, Integer key :partecipant_ids, Array Let's say I have a "record" with the following attributes: { :author_id => 10, :partecipant_ids => [10,15,201] } I want to retrieve all the objects where the partecipant with id 15 is involved. I did not find any mention in the documentation. The strange thing is that previously I was doing this query MessageThread.where :partecipant_ids => [15] which worked, but after (maybe) some change in the gem/mongodb version it stopped

Mongo in Java can be used with several tools: the 10gen official driver an alternative async Java driver a mapper — a library built on top of a driver — Morphia , Jongo ... ( see complete list ) Is there some benchmarks comparing mappers to drivers performances and one versus each others? Unfortunately, there are no benchmarks that I am aware of. The driver home page is here (but I'm guessing that you probably know that) and the Java Language Center containing all information related to Java for MongoDB. There is quite a bit of work going on with the Java drivers at present afaik but no