在将id保存为归属关系时存在问题

class Point < ActiveRecord::Base
    belongs_to :travel, :foreign_key=> \"travel_id\"
    belongs_to :user, :foreign_key=> \"user_id\"
end


class Travel < ActiveRecord::Base
    has_one :user, :foreign_key => \"user_id\"
    has_many :ways
    has_many :points
    attr_accessible :description, :start_date, :last_date
    validates_date :last_date, :on_or_after => :start_date
end

...
 def create
   @point = Point.new(params[:point])
   @point.user_id = current_user.id
   @travel = current_user.travels.find(:all, :conditions => {:open => true})
   @point.travel_id = @travel.id
   respond_to do |format|
     if @point.save
       format.html { redirect_to(@point, :notice => \'Point was successfully created.\') }
       format.xml  { render :xml => @point, :status => :created, :location => @point }
     else
       format.html { render :action => \"new\" }
       format.xml  { render :xml => @point.errors, :status => :unprocessable_entity }
     end
   end
 end
...