CODEWITHSUNDEEP
ruby-on-railstransactionsmongoid
Luis Crespo
Luis Crespo

Reputation: 1630

Perform Atomic Block Transactions in Rails with Mongoid

I'm using Rails 4.1.4 and Mongoid in my app.

I just wanted to know if there's a way to perform a block transaction atomically using Mongoid in Rails.

To make things clear, suppose I have this:

some_model_instance = SomeModel.find(some_id)
some_model_instance.some_attribute = "Some Attribute Value"
some_model_instance.save
other_model_instance = OtherModel.find(other_id)
other_model_instance.other_attribute = "Other Attribute Value"
other_model_instance.save

I want to wrap that code in a single atomic transaction, I mean, if something goes wrong I want neither of both instances (some_model_instance, other_model_instance) to be saved to the database.

I've seen that with ActiveRecord is somehow like this:

SomeModel.transaction do
    # do stuff I did above
end

Does that work also with Mongoid?.

Thanks for any help!!!.

Upvotes: 2

Views: 1817

Answers (2)

RAJ
RAJ

Reputation: 9747

It's an old question but just adding an update for future visitors. MongoDB has introduced multi-document transactions which help to bundle multiple document transactions as one.

From Mongo's documentation:

For situations that require atomicity of reads and writes to multiple documents (in a single or multiple collections), MongoDB supports multi-document transactions. With distributed transactions, transactions can be used across multiple operations, collections, databases, documents, and shards.

Here is the reference for details: https://www.mongodb.com/docs/manual/core/transactions

Upvotes: 0

Luis Crespo
Luis Crespo

Reputation: 1630

CLOSED QUESTION

MongoDB does not support transactions. It only performs atomic operations for a single document. So there's no way to make an "Atomic Block Transaction" with Mongoid.

Best.

Upvotes: 7

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