Tag Archives: activerecord

Includes & Eager Loading

by fadhli on 08. Jun, 2009 in Rails

I’m figuring out something in my rails app.  I’m figuring out which one’s the worst: Eager loading 100 rows of data you don’t actually need at the moment or 10 queries giving 10 result set at once? Here’s the code to explain it. 1 2 3 @event = Event.find(params[:event_id])   @event_attendees = @event.attendees.paginate(:page => params[:page], [...]

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Ensuring your join model uniqueness

by fadhli on 22. Jul, 2008 in Programming, Rails

For example: id |category_id | inventory_id 1 384 1 #first entry 2 384 2 #this would be ok. 3 384 1 #this would not be ok To ensure that a category_id doesn’t have any inventory_id duplicate: [sourcecode language="ruby"] class CategoryProduct < ActiveRecord::Base   belongs_to :category   belongs_to :inventory   validates_uniqueness_of :category_id, :scope => :inventory_id end [...]

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