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Contents
module Tori
module Backend
# Chain based on `exist?` method
# @example
# class Book < ActiveRecord::Base
# include Tori::Backend # short cut
#
# # If exist "lib/pdf" load this,
# # But nothing, Load from S3 "book" bucket.
# chain_backend = Chain.new(
# FileSystem.new(Pathname("lib/pdf")),
# S3.new(bucket: "book"),
# )
# tori :pdf, chain_backend do |model|
# "book/#{__tori__}/#{model.id}"
# end
# end
class Chain
class ExistError < StandardError
end
attr_accessor :backends
def initialize(*backends)
@backends = backends
end
def backend(filename)
@backends.each do |b|
if b.exist?(filename)
return b
end
end
raise ExistError, "exist(#{filename}) backend not found"
end
def exist?(filename)
backend(filename)
rescue ExistError
false
else
true
end
def read(filename)
backend(filename).read(filename)
end
def open(filename, &block)
backend(filename).open(filename, &block)
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems