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22 lines
796 B
Ruby
22 lines
796 B
Ruby
# frozen_string_literal: true
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# Provides helper methods to compute footprints
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class FootprintService
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# Compute the footprint
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# @param class_name Invoice|InvoiceItem|HistoryValue
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# @param item an instance of the provided class
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# @param sort the items in database by the provided criterion, to find the previous one
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def self.compute_footprint(klass, item, sort_on = 'id')
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raise TypeError unless item.is_a? klass
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previous = klass.where("#{sort_on} < ?", item[sort_on])
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.order("#{sort_on} DESC")
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.limit(1)
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columns = klass.columns.map(&:name)
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.delete_if { |c| %w[footprint updated_at].include? c }
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Checksum.text("#{columns.map { |c| item[c] }.join}#{previous.first ? previous.first.footprint : ''}")
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end
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end
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