class Neighbor::Type::Sparsevec

def cast_value(value)
  if value.is_a?(SparseVector)
    value
  elsif value.is_a?(String)
    SparseVector.from_text(value)
  elsif Utils.array?(value)
    value = SparseVector.new(value.to_a)
  else
    raise "can't cast #{value.class.name} to sparsevec"
  end
end

def serialize(value)
  if value.is_a?(SparseVector)
    value = "{#{value.indices.zip(value.values).map { |i, v| "#{i.to_i + 1}:#{v.to_f}" }.join(",")}}/#{value.dimensions.to_i}"
  end
  super(value)
end

def type
  :sparsevec
end