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Contents
module Alf
module Engine
#
# Generates tuples with an integer attributes, with an initial offset and
# a step.
#
# Example:
#
# Generator.new(3, :id, 10, 5).to_a
# # => [
# # {:id => 10},
# # {:id => 15},
# # {:id => 20}
# # ]
#
class Generator < Cog
# @return [Symbol] Name of the autonum attribute
attr_reader :as
# @return [Integer] Initial offset
attr_reader :offset
# @return [Integer] Generation step
attr_reader :step
# @return [Integer] Count number of tuples to generate
attr_reader :count
# Creates an Generator instance
def initialize(as, offset, step, count)
@as = as
@offset = offset
@step = step
@count = count
end
# (see Cog#each)
def each
cur = offset
count.times do |i|
yield(@as => cur)
cur += step
end
end
end # class Generator
end # module Engine
end # module Alf
Version data entries
5 entries across 5 versions & 1 rubygems