Aggregate does not accept properties on relationships in :fields #13
Description
Problem.aggregate(:id.count, :fields => [:user_id, "users.email"], :unique => true, :links => [:user])
ArgumentError: +field+ should be DataMapper::Query::Operator or Symbol or DataMapper::Property, but was String
from /Users/tpitale/.rvm/gems/ruby-1.9.2-p180@docket/gems/dm-aggregates-1.1.0/lib/dm-aggregates/functions.rb:158:in block in aggregate' from /Users/tpitale/.rvm/gems/ruby-1.9.2-p180@docket/gems/dm-aggregates-1.1.0/lib/dm-aggregates/functions.rb:158:inmap!'
from /Users/tpitale/.rvm/gems/ruby-1.9.2-p180@docket/gems/dm-aggregates-1.1.0/lib/dm-aggregates/functions.rb:158:in aggregate' from (irb):2 from /Users/tpitale/.rvm/gems/ruby-1.9.2-p180@docket/gems/railties-3.0.8/lib/rails/commands/console.rb:44:instart'
from /Users/tpitale/.rvm/gems/ruby-1.9.2-p180@docket/gems/railties-3.0.8/lib/rails/commands/console.rb:8:in start' from /Users/tpitale/.rvm/gems/ruby-1.9.2-p180@docket/gems/railties-3.0.8/lib/rails/commands.rb:23:in<top (required)>'
from script/rails:6:in require' from script/rails:6:in