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Contents
class Factory
# Raised when calling Factory.sequence from a dynamic attribute block
class SequenceAbuseError < StandardError; end
# Sequences are defined using Factory.sequence. Sequence values are generated
# using next.
class Sequence
def initialize (&proc) #:nodoc:
@proc = proc
@value = 0
end
# Returns the next value for this sequence
def next
@value += 1
@proc.call(@value)
end
end
class << self
attr_accessor :sequences #:nodoc:
end
self.sequences = {}
# Defines a new sequence that can be used to generate unique values in a specific format.
#
# Arguments:
# name: (Symbol)
# A unique name for this sequence. This name will be referenced when
# calling next to generate new values from this sequence.
# block: (Proc)
# The code to generate each value in the sequence. This block will be
# called with a unique number each time a value in the sequence is to be
# generated. The block should return the generated value for the
# sequence.
#
# Example:
#
# Factory.sequence(:email) {|n| "somebody_#{n}@example.com" }
def self.sequence (name, &block)
self.sequences[name] = Sequence.new(&block)
end
# Generates and returns the next value in a sequence.
#
# Arguments:
# name: (Symbol)
# The name of the sequence that a value should be generated for.
#
# Returns:
# The next value in the sequence. (Object)
def self.next (sequence)
unless self.sequences.key?(sequence)
raise "No such sequence: #{sequence}"
end
self.sequences[sequence].next
end
end
Version data entries
25 entries across 25 versions & 13 rubygems