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Generate Bill ID

When bills are saved into the couchdb database, they need an _id to uniquely identify themselves. It is possible to let couchdb generate the _id value. However using couchdb-generated _id values means that we need to perform existance checks client-side before saving a bill to ensure uniqueness

There should only every be a single record for a given bill in the database. Couchdb internally requires that each document have a unique _id value. If the _id for a bill is generated manually we can ensure each bill only gets saved once.


Each bill can be uniquely identified using the following fields.

  • supplierCode
  • accountNumber
  • billDate
  • billNumber

To generate the _id this module concatenates these values and calculates the sha1 hash value of the concatenated string. The sha1 hash is then used as the _id value

var generateBillID = require('docparse-generate-bill-id')
var generateData = {
  supplierCode: 'NGE',
  accountNumber: 'fooAccountNumber',
  billDate: '2011-01-19 00:00:00 +00:00',
  billNumber: 'barBillNumber'
generateBillID(generateData, function (err, billID) {
  if (err) {
    console.dir('error generating bill id')
  console.dir('generated bill id', billID)


See index.js for a implementation details


To run the tests execute in the shell

# install development dependencies
npm install
# run tests
npm test