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Contents
# -*- coding: utf-8 -*-
module Chicago
module ETL
module Transformations
# Cleans and reformats UK-based postcodes.
#
# Transformations are based on observed errors in data entry, so
# shift key slips (i.e. typing '!' where '1' was meant) are
# corrected, as are use of numbers where letters were intended
# i.e. (0X -> OX for Oxfordshire postcodes).
#
# Leaves BFPO postcodes alone.
class UkPostCode
# Creates a new post code transformation.
#
# @param Symbol column_name - the name of the column
# containing the post code.
#
# @param Proc filter_block - an optional block, which takes a
# row. If the block returns false, the transformation will
# not be run. This can be useful to only run the
# transformation on UK addresses, based a country field in
# the row for example.
def initialize(column_name, &filter_block)
@column_name = column_name
@filter_block = filter_block
end
def call(row, errors=[])
return [row, errors] if @filter_block && !@filter_block.call(row)
row[@column_name] = UkPostCodeField.new.
normalize(row[@column_name])[:post_code]
[row, errors]
end
end
end
end
end
Version data entries
18 entries across 18 versions & 1 rubygems