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64 lines
2.3 KiB
Ruby
64 lines
2.3 KiB
Ruby
# frozen_string_literal: true
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require 'integrity/checksum'
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require 'json'
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# Provides helper methods to compute footprints
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class FootprintService
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class << self
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# @param item [Footprintable]
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# @param previous_footprint [String,NilClass]
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# @param columns [Array<String>]
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# @return [Hash<Symbol->String,Integer,Hash>]
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def chained_data(item, previous_footprint = nil, columns = nil)
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columns ||= footprint_columns(item.class)
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res = {}
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columns.each do |column|
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next if column.blank? || item[column].blank?
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res[column] = comparable(item[column])
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rescue ActiveModel::MissingAttributeError
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res[column] = nil
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end
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res['previous'] = previous_footprint
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res.sort.to_h
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end
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# Return an ordered array of the columns used in the footprint computation
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# @param klass [Class] a class inheriting from Footprintable
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def footprint_columns(klass)
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%w[id].concat(klass.columns.map(&:name).delete_if do |column|
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%w[id footprint updated_at].concat(klass.columns_out_of_footprint).include?(column)
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end.sort)
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end
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# Logs a debugging message to help finding why a footprint is invalid
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# @param klass [Class] a class inheriting from Footprintable
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# @param item [Footprintable] an instance of the provided class
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def debug_footprint(klass, item)
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current = chained_data(item, item.chained_element.previous&.footprint, item.chained_element.columns)
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saved = item.chained_element&.content&.sort&.to_h&.transform_values { |val| val.is_a?(Hash) ? val.sort.to_h : val }
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if saved.nil?
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" #{klass} [ id: #{item.id} ] is not chained"
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else
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"Debug footprint for #{klass} [ id: #{item.id} ]\n" \
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"-----------------------------------------\n" \
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"=== current ===\n#{JSON.pretty_generate(current)}\n\n=== saved ===\n#{JSON.pretty_generate(saved)}\n" \
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"-----------------------------------------\n" +
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item.footprint_children.map(&:debug_footprint).join("\n\n")
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end
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end
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private
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# Return a comparable value for jsonb fields (with keys ordered alphabetically)
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def comparable(value)
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return value.iso8601 if value.is_a? Time
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return value unless value.is_a? Hash
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value.sort.to_h.transform_values! { |v| comparable(v) }
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end
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end
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end
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