Adding own id automatically using packages "collection2", "simple-schema", "autoform"

1

Hi I try to find a solution to the placement of form data to the data collection MongoDB database, automatically add its own ID on such values: 2015/1, 2015/2, 2015/3 … … and so on.

He tried to use modules “collection2”, “simple-schema”, “autoform” but I found just as automatically add date:

    // Force value to be current date (on server) upon insert
  // and prevent updates thereafter.
  createdAt: {
    type: Date,
    autoValue: function() {
      if (this.isInsert) {
        return new Date;
      } else if (this.isUpsert) {
        return {$setOnInsert: new Date};
      } else {
        this.unset();  // Prevent user from supplying their own value
      }
    }
  }

Does anyone have an idea how to automatically add your own id to the collection of data.