Rails - Feb 2006 - has_many finder_sql #{id} single/double quotes voodoo

I never would have figured this out in many moons:

  has_many :subscribers, :class_name => "Person",
:finder_sql =>
      ''SELECT DISTINCT people.* '' +
      ''FROM people p, post_subscriptions ps '' +
      ''WHERE ps.post_id = #{id} AND ps.person_id p.id '' +
      ''ORDER BY p.first_name''

Variable interpolation in *single* quotes? Putting it
in double quotes results in a really high number
(541239078 vs. 15 in my case). Is this explained
somewhere?

csn

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