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Standup 2010.08.06: Evil Scopiness Edition

Interesting Things

find_in_batches has Evil Scopiness

ActiveRecord::Base#find_in_batches() (and therefore #find_each()) is applying a scope around the block it is given, which applies to any subsequent find call on that model:

Let’s say we have a Comment model that act_as_tree so comments can be threaded. In the following code:

Comment.find_each(:conditions => "comments.state = 'published'") do |comment|
puts comment.parent.content

The association call to .parent will also have the scope {:conditions => "comments.state = 'published'"} applied to it. This can have highly unexpected side-effects.

The way to get around this is:

Comment.find_each(:conditions => "comments.state = 'published'") do |comment|
Comment.with_exclusive_scope(:find => {}) do
puts comment.parent.content

Easy Ruby profiling

If you’re profiling Ruby code often, here’s a code snippet that can be useful:

  1. Alex Chaffee says:

    `STDOUT` always points to the file handle that stdout had when ruby was started. Use `$stdout` instead, which allows people to redirect standard output at runtime, which is very useful for e.g. tests, or running a server inside a server.

    More details at <> and <>.

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