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require 'interpol/define_singleton_method' unless Object.method_defined?(:define_singleton_method)
module Interpol
# Transforms an arbitrarily deeply nested hash into a dot-syntax
# object. Useful as an alternative to a hash since it is "strongly typed"
# in the sense that fat-fingered property names result in a NoMethodError,
# rather than getting a nil as you would with a hash.
class DynamicStruct
attr_reader :attribute_names, :to_hash
def initialize(hash)
@to_hash = hash
@attribute_names = hash.keys.map(&:to_sym)
hash.each do |key, value|
value = method_value_for(value)
define_singleton_method(key) { value }
define_singleton_method("#{key}?") { !!value }
end
end
private
def method_value_for(hash_value)
return self.class.new(hash_value) if hash_value.is_a?(Hash)
if hash_value.is_a?(Array) && hash_value.all? { |v| v.is_a?(Hash) }
return hash_value.map { |v| self.class.new(v) }
end
hash_value
end
include DefineSingletonMethod unless method_defined?(:define_singleton_method)
end
end
Version data entries
10 entries across 10 versions & 1 rubygems