Sha256: b1438030667906eaffd5791997033c19c42e885bf584b4d0706d4506b7e070e1
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Size: 876 Bytes
Versions: 5
Compression:
Stored size: 876 Bytes
Contents
module Alf
module Engine
#
# Renames tuples from the operand according to a Renaming info.
#
# Example:
#
# rel = [
# {:name => "Jones", :city => "London"}
# ]
# Rename.new(rel, Renaming[:name => :last_name]).to_a
# # => [
# # {:last_name => "Jones", :city => "London"}
# # ]
#
class Rename < Cog
# @return [Enumerable] The operand
attr_reader :operand
# @return [Renaming] Renaming info
attr_reader :renaming
# Creates a Rename instance
def initialize(operand, renaming)
@operand = operand
@renaming = renaming
end
# (see Cog#each)
def each
operand.each do |tuple|
yield @renaming.rename_tuple(tuple)
end
end
end # class Rename
end # module Engine
end # module Alf
Version data entries
5 entries across 5 versions & 1 rubygems