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Editorial Team
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Asked: 2026-05-15T00:09:42+00:00

i am familiar with memcached and eager loading, but neither seems to solve the

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i am familiar with memcached and eager loading, but neither seems to solve the problem i am facing.

My main performance lag comes from hundreds of data retrieval calls from the database. The tricky thing is that I do not know which set of users i need to retrieve until i have several steps of computation.

I can refactor my code, but i was wondering how you experts handle this situation? I think it should be a fairly common situation

def newsfeed

  - find out which users i need
  - retrieve those users via DB

  - find out which events happened for these users
  - for each of those events
        - retrieve new set of users

  - find out which groups are relevant
  - for each of those groups
        - retrieve new set of users 

  - etc, etc 

end
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1 Answer

  1. Editorial Team

    Denormalization is the magic password for your situation.

    There are several ways to do this:
    For example, store the ids of the last 10 users in the event and group.

    Or create a new model NewsFeedItem (belongs_to :parent, :polymorphic => true). When a user attends an event, create a NewsFeedItem with denormalized informations like this users name, his profile pic etc. Saves you from second queries to user_events and users.

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