29 行
1.0 KiB
Ruby
29 行
1.0 KiB
Ruby
# Coordinates carry their aggregation depth; SQL NULL remains an ordinary axis value.
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class CountsPivotLayout
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def self.depths(keys, sorts, measures: true)
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return [] if keys.length < 2 || sorts.first&.first == 'count' ||
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sorts.first&.first&.match?(/\Am[0-9]+\z/)
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relevant = sorts.map(&:first).select { keys.include?(_1) || (measures && (_1 == 'count' ||
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_1.match?(/\Am[0-9]+\z/))) }
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order = (relevant + keys).uniq
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(1...keys.length).select { order.first(_1).sort == keys.first(_1).sort }
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end
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def self.headers(values, depths, next_values: nil, grand: false)
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result = []
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values.each_with_index do |tuple, index|
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result << { values: tuple, kind: 'data' }
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following = values[index + 1] || next_values
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depths.reverse_each do |depth|
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prefix = tuple.first(depth)
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next if following && following.first(depth) == prefix
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result << { values: prefix, kind: 'subtotal' }
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end
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end
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result << { values: [], kind: 'grand_total' } if grand
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result
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end
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end
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