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Add some comments for ThroughReflection#through_reflection_chain

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Jon Leighton
2010-10-19 17:40:14 +01:00
parent 7ee33b80a2
commit 2aa9388746
1 changed files with 10 additions and 1 deletions
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11
activerecord/lib/active_record/reflection.rb
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@@ -368,7 +368,16 @@ module ActiveRecord
@through_reflection ||= active_record.reflect_on_association(options[:through])
end
# TODO: Documentation
# Returns an array of AssociationReflection objects which are involved in this through
# association. Each item in the array corresponds to a table which will be part of the
# query for this association.
#
# If the source reflection is itself a ThroughReflection, then we don't include self in
# the chain, but just defer to the source reflection.
#
# The chain is built by recursively calling through_reflection_chain on the source
# reflection and the through reflection. The base case for the recursion is a normal
# association, which just returns [self] for its through_reflection_chain.
def through_reflection_chain
@through_reflection_chain ||= begin
if source_reflection.source_reflection