It would be nice to allow aggregate key to be of different data type

[twoixter]

Currently, an aggregation key must be a String. For example

aggregate :browsers do |b|
    b.id   # <= This gets automatically casted to a string by calling ".to_s"
end

It would be nice to allow for BSON::ObjectID or DateTime keys. However, this would not be possible without using Inheritance for the Aggregation class model. I can replace the :ns (namespace) field and use Inheritance instead (automatically using the :_type field).

[mattiassvedhem]

Wouldn't it be possible to do something like this?

Mongoid::Tracking::Aggregates

def aggregate(args*, &block)
  *omitted*
  name = args.shift
  define_aggregate_model(args.extract_options!) if aggregate_klass.nil?
  *omitted*
end

def define_aggregate_model(args)
  field :key, args
end

And then in the model:

aggregate :sources, type: Symbol do |key|
  key.present? ? key.to_s : nil
end