ruby - 如何将 OpenSSL Digest 结果转换为 BigDecimal/DataMapper::Property::Decimal

Question

我有这样的事情：

x = OpenSSL::Digest::SHA512.new('test').digest
# "\xEE&\xB0\xDDJ\xF7\xE7I\xAA\x1A\x8E\xE3\xC1\n\xE9\x92?a\x89\x80w.G?\x88\x19\xA5\xD4\x94\x0E\r\xB2z\xC1\x85\xF8\xA0\xE1\xD5\xF8O\x88\xBC\x88\x7F\xD6{\x1472\xC3\x04\xCC_\xA9\xAD\x8EoW\xF5\x00(\xA8\xFF"

如何将 x 转换为 BigDecimal，或更具体的 DataMapper::Property::Decimal？所以我可以搜索它

class MyRecord
  include DataMapper::Resource
  property :id, Serial
  property :amount, Decimal, precision: 156
end

DataMapper.finalize
DataMapper.auto_migrate!

x = OpenSSL::Digest::SHA512.new('test').digest
x = # convert to BigDecimal or DataMapper::Property::Decimal

y = MyRecord.new
y.amount = x
y.save 

z = MyRecord.first(amount: x)

或者，如果没有捷径，存储这些值的正确类型是什么？因为 PostgreSQL 的字符串不能存储 NULL 字符

Answer 1

我会尝试 DataMapper 的Binary类型：

class MyRecord
  include DataMapper::Resource
  property :id, Serial
  property :amount, Binary, length: 64
end

另一种方法是对摘要进行 base64 编码并将其存储为字符串：

class MyRecord
  include DataMapper::Resource
  property :id, Serial
  property :amount, String, length: 88
end

接着：

require 'base64'

x = OpenSSL::Digest::SHA512.new('test').digest
x = Base64.strict_encode64(x)

y = MyRecord.new
y.amount = x
y.save