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| author | Bryan Helmkamp <bryan@brynary.com> | 2009-05-17 15:42:42 -0400 |
|---|---|---|
| committer | Bryan Helmkamp <bryan@brynary.com> | 2009-05-17 15:42:42 -0400 |
| commit | 8339f024c7663133a78c4d0a8824b5b6fafaf239 (patch) | |
| tree | a43ebc9c956d8484647d81e5ea14534e7b0570a0 /lib/arel/algebra/relations/row.rb | |
| parent | 4c71e3b2ea4b8da574954cbd8a26d12f2cc640d0 (diff) | |
| download | rails-8339f024c7663133a78c4d0a8824b5b6fafaf239.tar.gz rails-8339f024c7663133a78c4d0a8824b5b6fafaf239.tar.bz2 rails-8339f024c7663133a78c4d0a8824b5b6fafaf239.zip | |
recursive memory operations now possible
Conflicts:
lib/arel/algebra/relations/relation.rb
Diffstat (limited to 'lib/arel/algebra/relations/row.rb')
| -rw-r--r-- | lib/arel/algebra/relations/row.rb | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/lib/arel/algebra/relations/row.rb b/lib/arel/algebra/relations/row.rb new file mode 100644 index 0000000000..2d63498452 --- /dev/null +++ b/lib/arel/algebra/relations/row.rb @@ -0,0 +1,21 @@ +module Arel + class Row + attributes :relation, :tuple + deriving :==, :initialize + + def [](attribute) + tuple[relation.position_of(attribute)] + end + + def slice(*attributes) + Row.new(relation, attributes.inject([]) do |cheese, attribute| + cheese << self[attribute] + cheese + end) + end + + def bind(relation) + Row.new(relation, tuple) + end + end +end
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