Mixin' it Up: Datastore_edition
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This document discusses using multiple databases together in a Rails application. It describes initially using MongoDB with Mongoid for objects but finding that a relational database is better suited for other models with relations. The solution presented is to use Mongoid to store objects in MongoDB but query relations through ActiveRecord to a SQL database, allowing the benefits of both types of databases to be utilized. Code examples are provided showing how this approach reduces the number of queries needed.
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- 3. Using only an object store on a largeish app and then remembering you can use more than one database in a system
- 4. The (Central) Problem Hierarchical forms & responses
- 5. Survey Response Question (text) Answer Question Group Answer Group Question (date) Answer (date) Question (phone #) Answer (phone #)
- 6. NUMBERS Lots of questions Lots of forms Lots of users Lots of responses = Lots of queries
- 7. "We need an object store!"
- 8. MONGOID! feels like ActiveRecord inside MongoDB
- 11. "Mongoid has helpers for relations?!"
- 12. Response Survey User Not bad.
- 13. (months pass...)
- 15. User Survey Campaign (etc.) (very etc.) Organization Response Oh.
- 17. Mongoid works perfectly for those two models
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- 25. No foreign keys
- 26. I accidentally the object
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- 29. Just Mongoid
- 30. Querying # 2 queries surveys = Survey.where(:campaign_id.in => @user.campaigns.map(&:id)) survey_ids = surveys.map(&:id) # + 1 query Response.where(:survey_id.in => survey_ids, :complete => true).first.answers # = 3 total queries for search, not chainable
- 31. Interlude
- 34. Bridging the gap
- 36. Search with SQL, store with Mongo # 1 query Response. joins(:survey, :campaign). where('complete' => true, "campaigns.user_id" => @user.id). first. answer_collection # = 1 total query for search, chainable
- 39. Should we gemify this?
- 41. Thanks