Sum with money-rails Money type

Working with Data
, ,
1

Hi,
Is there a way to do a sum using GitHub - RubyMoney/money-rails: Integration of RubyMoney - Money with Rails?

field :order_total, type: Money

This doesn’t work (using Mongoid):

start_date = DateTime.new(2025,6,1,0,0,0)
OrderList.where(:created_at.gte => start_date).sum(order_total)

Nor does this:

pipeline = [
{
  '$match': {
    created_at: { '$gte': start_date }
  }
},
{
  '$group': {
    _id: nil,
	total_amount: { '$sum': "order_total" }
  }
}
]
result = OrderList.collection.aggregate(pipeline).first

Any ideas?