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Contents
# frozen_string_literal: true
require "csv"
module Decidim
module Exporters
# Exports any serialized object (Hash) into a readable CSV. It transforms
# the columns using slashes in a way that can be afterwards reconstructed
# into the original nested hash.
#
# For example, `{ name: { ca: "Hola", en: "Hello" } }` would result into
# the columns: `name/ca` and `name/es`.
class CSV < Exporter
# Public: Exports a CSV serialized version of the collection using the
# provided serializer and following the previously described strategy.
#
# Returns an ExportData instance.
def export
data = ::CSV.generate(headers: headers, write_headers: true, col_sep: ";") do |csv|
processed_collection.each do |resource|
csv << headers.map { |header| resource[header] }
end
end
ExportData.new(data, "csv")
end
private
def headers
return [] if processed_collection.empty?
processed_collection.first.keys
end
def processed_collection
@processed_collection ||= collection.map do |resource|
flatten(@serializer.new(resource).serialize)
end
end
def flatten(object, key = nil)
if object.is_a? Hash
object.inject({}) do |result, (subkey, value)|
new_key = key ? "#{key}/#{subkey}" : subkey.to_s
result.merge(flatten(value, new_key))
end
elsif object.is_a?(Array)
{ key.to_s => object.map(&:to_s).join(", ") }
else
{ key.to_s => object }
end
end
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems