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Contents
module Alf
module Engine
#
# Coerce input tuples according to a Heading. Attributes that do not belong
# to the heading are simply ignored but are kept in the output.
#
# Example:
#
# operand = [
# {:name => "Jones", :price => "10.0"},
# {:name => "Smith", :price => "-12.0"}
# ]
#
# Coerce.new(operand, Heading[:price => Float]).to_a
# # => [
# # {:name => "Jones", :price => 10.0},
# # {:name => "Smith", :price => -12.0}
# # ]
#
class Coerce
include Cog
# @return [Enumerable] The operand
attr_reader :operand
# @return [Heading] Heading for coercions
attr_reader :coercions
# Creates an Coerce instance
def initialize(operand, coercions, expr = nil, compiler = nil)
super(expr, compiler)
@operand = operand
@coercions = coercions
end
# (see Cog#each)
def _each
@operand.each do |tuple|
yield tuple.merge(Hash[@coercions.map{|k,d|
[k, Support.coerce(tuple[k], d)]
}])
end
end
def arguments
[ coercions ]
end
end # class Coerce
end # module Engine
end # module Alf
Version data entries
5 entries across 5 versions & 1 rubygems