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Contents
# Copyright (c) 2011 - 2013, SoundCloud Ltd., Rany Keddo, Tobias Bielohlawek, Tobias
# Schmidt
module Lhm
# Determine and format columns common to origin and destination.
class Intersection
def initialize(origin, destination, renames = {})
@origin = origin
@destination = destination
@renames = renames
end
def origin
(common + @renames.keys).extend(Joiners)
end
def destination
(common + @renames.values).extend(Joiners)
end
private
def common
(@origin.columns.keys & @destination.columns.keys).sort
end
module Joiners
def escaped
map { |name| tick(name) }
end
def joined
escaped.join(', ')
end
def typed(type)
map { |name| qualified(name, type) }.join(', ')
end
private
def qualified(name, type)
"`#{ type }`.`#{ name }`"
end
def tick(name)
"`#{ name }`"
end
end
end
end
Version data entries
27 entries across 27 versions & 2 rubygems