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Contents
# frozen_string_literal: true
module Zizia
##
# A generic metadata mapper for input records
#
# Maps from hash accessor syntax (`['title']`) to method call dot syntax (`.title`)
#
# The fields provided by this mapper are dynamically determined by the fields
# available in the provided metadata hash.
#
# All field values are given as multi-valued arrays.
#
# @example
# mapper = HashMapper.new
# mapper.fields # => []
#
# mapper.metadata = { title: 'Comet in Moominland', author: 'Tove Jansson' }
# mapper.fields # => [:title, :author]
# mapper.title # => ['Comet in Moominland']
# mapper.author # => ['Tove Jansson']
#
class HashMapper < MetadataMapper
##
# @param meta [#to_h]
# @return [Hash<String, String>]
def metadata=(meta)
@metadata = meta.to_h
end
##
# @return [Enumerable<Symbol>] The fields the mapper can process
def fields
return [] if metadata.nil?
metadata.keys.map(&:to_sym)
end
##
# @see MetadataMapper#map_field
def map_field(name)
Array(metadata[name.to_s])
end
end
end
Version data entries
35 entries across 35 versions & 1 rubygems