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Contents
require 'rom/initializer'
require 'rom/data_proxy'
module ROM
# A helper module that adds data-proxy behavior to an enumerable object
#
# This module is intended to be used by gateways
#
# Class that includes this module can define `row_proc` class method which
# must return a proc-like object which will be used to process each element
# in the enumerable
#
# @example
# class MyDataset
# include ROM::EnumerableDataset
#
# def self.row_proc
# -> tuple { tuple.each_with_object({}) { |(k,v), h| h[k.to_sym] = v } }
# end
# end
#
# ds = MyDataset.new([{ 'name' => 'Jane' }, [:name])
# ds.to_a # => { :name => 'Jane' }
#
# @api public
module EnumerableDataset
extend DataProxy::ClassMethods
include Enumerable
# Coerce a dataset to an array
#
# @return [Array]
#
# @api public
alias_method :to_ary, :to_a
# Included hook which extends a class with DataProxy behavior
#
# This module can also be included into other modules so we apply the
# extension only for classes
#
# @api private
def self.included(klass)
return unless klass.is_a?(Class)
klass.class_eval do
extend Initializer
include DataProxy
param :data
end
end
forward :take
[
:chunk, :collect, :collect_concat, :drop_while, :find_all, :flat_map,
:grep, :map, :reject, :select, :sort, :sort_by, :take_while
].each do |method|
class_eval <<-RUBY, __FILE__, __LINE__ + 1
def #{method}(*args, &block)
return to_enum unless block
self.class.new(super(*args, &block), options)
end
RUBY
end
end
end
Version data entries
31 entries across 31 versions & 2 rubygems