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Asked: 2026-05-26T12:11:24+00:00

edit 2 If you stumble across this, check both answers as I’d now use

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edit 2

If you stumble across this, check both answers as I’d now use pluck for this

I have a fairly large custom dataset that I’d like to return to be echoe’d out as json. One part is:

l=Location.find(row.id)
tmp[row.id]=l

but I’d like to do something like:

l=Location.find(row.id).select("name, website, city")
tmp[row.id]=l

but this doesn’t seem to be working. How would I get this to work?

thx

edit 1
alternatively, is there a way that I can pass an array of only the attributes I want included?

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1 Answer

  1. Editorial Team

    In Rails 2

    l = Location.find(:id => id, :select => "name, website, city", :limit => 1)

    …or…

    l = Location.find_by_sql(:conditions => ["SELECT name, website, city FROM locations WHERE id = ? LIMIT 1", id])

    This reference doc gives you the entire list of options you can use with .find, including how to limit by number, id, or any other arbitrary column/constraint.

    In Rails 3 w/ActiveRecord Query Interface

    l = Location.where(["id = ?", id]).select("name, website, city").first

    Ref: Active Record Query Interface

    You can also swap the order of these chained calls, doing .select(...).where(...).first – all these calls do is construct the SQL query and then send it off.

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