在 Rails 控制台上，我正在尝试调用
@invoice = Invoice.all
它返回了一些对象，例如
<Neo4j::Traversal::Traverser:0x817382>
但是当我试图像这样循环对象时
@invoice.each { |t| p t.number }
我得到了零，但数据库包含发票数据。
发票类
class Invoice < Searchable
include Neo4jrb::Paperclip
include LinkableEntity
include HeadsupNotify
enable_optimistic_locking
before_destroy :verify_links, :prepend => true
before_destroy :destroy_invoice_items
property :number, :type => :string
property :currency, :default => Money.default_currency.to_s
property :date, :pay_by_date, :type => :date
property :purchase_order_number
property :settle, :default => false
property :link_1, :link_2, :type => :string
index :number, :type => :fulltext
domain_property :details
money_property :total_cost, :receivable_amount
attr_protected :total_cost, :receivable_amount
attr_accessor :delink_receipt
validates :total_cost, :numericality => {:greater_than_or_equal_to => 0}
validates :receivable_amount, :numericality => {:greater_than_or_equal_to => 0}
validates :date,:number, :customer_id, :event_id, :project_id, :department_id,
:brand_id, :premise_id, :user_id, :currency, :presence => true
validates :link_1, :length => { :maximum => 250 }
validates :link_2, :length => { :maximum => 250 }
validate :number_uniqueness
validate :invoice_items_present
validate :invoice_items_currency
validate :issue_credit_notes_valid
validate :pay_by_date_valid, :unless => "date.nil?"
validate :check_not_linked, :on => :update
has_one(:event).from(Event, :invoices_for_event)
has_one(:project).from(Project, :invoices_for_project)
has_one(:department).from(Department, :invoices_for_department)
has_one(:brand).from(Brand, :invoices_for_brand)
has_one(:premise).from(Premise, :invoices_for_premise)
has_one(:user).to(User)
has_one(:customer).from(Customer, :invoices_for_customer)
alias :party :customer
has_n(:invoice_items).to(InvoiceItem)
has_n(:receipts).from(Receipt, :paid_invoices)
has_n(:issue_credit_notes).from(IssueCreditNote, :credit_notes_for_invoice)
has_one(:invoices_for_settle).to(Settle)
links :receipts, :issue_credit_notes,:invoices_for_settle
has_neo4jrb_attached_file :photo
{:customer => :name, :event => :name, :department => :name, :project => :name, :brand => :name,
:premise => :name, :user => :email}.each do |target, method|
delegate method, :to => target, :prefix => true, :allow_nil => true
end
accepts_id_for :customer, :event, :project, :department, :brand, :premise, :user
accepts_nested_attributes_for :invoice_items, :allow_destroy => true
validates_associated :invoice_items
validates :customer_name, :presence => true, :length => { :maximum => 100 }
validates :event_name, :presence => true, :length => { :maximum => 100 }
validates :premise_name, :presence => true, :length => { :maximum => 100 }
validates :project_name, :presence => true, :length => { :maximum => 100 }
validates :brand_name, :presence => true, :length => { :maximum => 100 }
validates :department_name, :presence => true, :length => { :maximum => 100 }
validates :link_1, :length => { :maximum => 250 }
validates :link_2, :length => { :maximum => 250 }
after_validation :set_total_cost
serialize :methods => :invoice_items
before_validation :delink
谁能帮我解决这个问题？
提前致谢。