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Contents
# frozen_string_literal: true
class CollectionPresenter
# Initialises an enumerable collection of initialised presenters for the
# corresponding original_collection of objects, for example a collection
# of Letter objects.
#
# The *options catches:
# - presenter_class, optional
# - view_context, optional
#
# It is written this way because I needed to add an optional view_context
# (which some Presenters may need) without breaking existing usage.
def initialize(original_collection, *options)
@original_collection = original_collection
presenter_class, view_context = parse_options(options, block_given?)
@decorated_collection ||= Enumerator.new do |yielder|
original_collection.each do |element|
presenter = if block_given?
yield(element)
else
build_presenter(presenter_class, element, view_context)
end
yielder.yield(presenter)
end
end
end
def to_ary
@decorated_collection.to_a
end
def to_a
@decorated_collection.to_a
end
delegate :size, to: :to_ary
def to_json
@decorated_collection.map(&:to_hash).to_json
end
def method_missing(method, *args, &block)
if @decorated_collection.respond_to?(method)
@decorated_collection.public_send(method, *args, &block)
else
@original_collection.public_send(method, *args, &block)
end
end
def respond_to?(method)
@decorated_collection.respond_to?(method) || @original_collection.respond_to?(method)
end
private
def parse_options(options, block_given)
options = Array(options)
if options.empty? && !block_given
raise "A presenter class must be supplied if no block given"
end
presenter_class = options[0]
view_context = options[1]
[presenter_class, view_context]
end
def build_presenter(klass, element, view_context)
args = [element]
args << view_context if view_context.present?
klass.new(*args)
end
end
Version data entries
71 entries across 71 versions & 1 rubygems