Home/ Questions/Q 6136923
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-23T17:39:49+00:00

I’m currently using SQLite3 with a simple post and image sharing app, similar to

  • 0

I’m currently using SQLite3 with a simple post and image sharing app, similar to the Rails 3 Hartl tutorial (in terms of db structure). But I’d like to move to Mongo for future scalability/learning.

I’m also hosted on Heroku, and am using a 15 GB shared db. I attempted to install MongoHQ and MongoMapper (as per Heroku’s instructions) for the transition and this part according to Heroku’s support is set up correctly. However, when I turn off the shared db, the app stops working, rather than running off of Mongo.

I’m not sure what do do next, do I have to rewrite my code in mongo or does mongo mapper solve all that? Do I lose my data if I change, if so, how do I copy?

Could any of you please point me to some resources or help me out? Thank you very much!!

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    MongoDB is not a drop in replacement for a SQL database. There are a couple of things you need to adapt:

    • The models’ code are to be updated to use MongoDB. I can suggest using Mongoid, an ODM, as it will ease your learning path. Mongoid implements Active Record.

    • The current data saved in your SQL database needs to be migrated – and this is not automatic – to MongoDB schemas. MongoDB do not support migrations as you are used to in SQL world. You will need to write your own scripts for that.

    I suggest you write a simple app from scratch using your MongoDB ODM of choice – MongoMapper or Mongoid – so that you get familiar with the basis of MongoDB before attempting to make a migration.

    • 0