Grunt example setting config from a db

setfromdb.js

grunt.initConfig({
  db: {
    // Books will be populated when setfromdb is ran
    books: []
  },
  other: {
    target: {
      options: {
        // Now when other:target is ran it will consume db.books
        books: '<%= db.books %>'
      }
    }
  }
});

grunt.registerTask('setfromdb', function() {
  var done = this.async();
  var mongoose = require('mongoose');
  mongoose.connect('mongodb://localhost/my_database');
  var Book = mongoose.model('Book');
  Book.find({}, function(err, books) {
    grunt.config('db.books', books);
    done();
  });
});

grunt.registerTask('default', ['setfromdb', 'other', 'tasks']);