DateTime and DataMapper

Question

问题

我基本上是想在DM中节省+4个小时。我认为DateTime是正确的，但DataMapper不能正常工作。有什么想法吗？

控制器

p DateTime.now
t = DateTime.now + params[:hours] / 24
p t
reward = @player.work params[:hours]
action = Action.new(:player => @player, :type => 0, :completed_at => t, :reward => reward)

模型

class Action
include DataMapper::Resource
property :id, Serial
property :type, Integer
property :completed_at, DateTime
property :reward, Integer
TYPES = {
  0 => "Work",
  1 => "Arena",
  2 => "Quest"
}
validates_with_method :type, :method => :valid_type?
def valid_type?
  if TYPES.key? self.type.to_i
    true
  else
    [false, "Invalid action type."]
  end
end
def get_type
  case TYPES[self.type]
  when "Work"
    "you're working"
  when "Arena"
    "in the arena"
  when "Quest"
    "in a quest"
  end
end
 belongs_to :player
end

Answer 1

尝试：DateTime.now+(params[：hours]/24.0(