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Contents
module ArcFurnace
# This allows one to merge multiple rows into one such as:
# key, value
# 1, foo
# 1, bar
# 2, baz
# Results in:
# 1 => { key => 1, value: [foo, bar] }
# 2 => { key => 2, value: baz }
class MergingHash < ::ArcFurnace::Hash
private_attr_reader :source, :hash
def prepare
loop do
break if source.empty?
row = source.row
row_key = row[key_column]
if row_key
row_entry = hash[row_key] ||= {}
row.each do |column, values|
existing_column_values = row_entry[column]
if existing_column_values && column != key_column
if existing_column_values.is_a?(Array)
existing_column_values.concat(Array.wrap(values))
else
new_row_entry = Array.wrap(existing_column_values)
new_row_entry.concat(Array.wrap(values))
row_entry[column] = new_row_entry
end
else
unless values.nil?
row_entry[column] = values.dup
end
end
end
end
end
end
end
end
Version data entries
40 entries across 40 versions & 1 rubygems