git_revision_in_mongoose.coffee

{exec} = require('child_process')
version_hash = null

exec 'git rev-parse HEAD', (err,output) ->
  # get revision hash from git and strip whitespaces
  version_hash = if output then output.replace(/\s/g, '') else null

# uesed as default for mongoose
versionHash = -> version_hash

# use in your mongoose schema
user = new Schema
  name: String
  email:
    type: String
    index: true
  version:
    type: String
    default: versionHash