lib/lionel/export_builder.rb
module Lionel
class ExportBuilder
def self.build(&block)
new.configure(&block)
end
def self.default
build do
A { id }
B { name }
C { url }
end
end
def configure(&block)
instance_eval(&block)
self
end
def columns
@columns ||= {}
end
def method_missing(sym, *args, &block)
column_name = sym.to_s.upcase
if column_name =~ /\A[A-Z]+\z/
columns[sym.to_s.upcase] = block_given? ? block : lambda { args.first }
else
raise ColumnNameError.new("Method '#{sym}' does not represent a valid Google Spreadsheet column name")
end
end
end
end