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# File 'lib/unitsml/utility.rb', line 71
def dim_id(dims)
return nil if dims.nil? || dims.empty?
dim_hash = dims.each_with_object({}) { |h, m| m[h[:dimension]] = h }
dims_vector = DIMS_VECTOR.map { |h| dim_hash.dig(h, :exponent) }.join(":")
id = Unitsdb.dimensions.find_by_vector(dims_vector)&.id and return id.to_s
"D_" + dims.map do |d|
(U2D.dig(d[:unit], :symbol) || Dim2D.dig(d[:id], :symbol)) +
(d[:exponent] == 1 ? "" : float_to_display(d[:exponent]))
end.join("")
end
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