堆栈级别太深错误导致我的应用程序崩溃。 我有一个包含两行的存款模型:收入和现金支出。 这两行由收入和提款模型中的 after_create 回调修改。 在提款模型中,我想使用 before_create 回调来验证存款余额(创建提款后存款余额必须大于或等于 0)并收到错误消息: CashoutsController#create 中的 SystemStackError。
ps:收入回调正常。
代码:
存款.rb
class Deposit < ActiveRecord::Base
belongs_to :user
has_many :incomes
has_many :cashouts
end
架构.rb
...
create_table "deposits", force: true do |t|
t.integer "user_id"
t.datetime "created_at"
t.datetime "updated_at"
t.decimal "income", precision: 12, scale: 2
t.decimal "cashout", precision: 12, scale: 2, default: 0.0
end
提现.rb
class Cashout < ActiveRecord::Base
belongs_to :deposit
validates :deposit_id, :order_sum, presence: true
validates :order_sum, numericality: true
validates :order_sum, numericality: { greater_than_or_equal_to: 0}
before_create :validate_order #before_save crashed too
after_create :update_deposit_cashout # working fine
private
def validate_order
@deposit = self.deposit
@income = @deposit.income
@cashout = self.order_sum
if @income - @cashout >= 0
self.save
else
!self.save
end
end
def update_deposit_cashout
@deposit = self.deposit
@deposit.update_attributes(:cashout => @cashout + self.order_sum)
end
end
cashouts_controller.rb
class CashoutsController < ApplicationController
before_action :signed_in_user, only: [:create]
def new
@cashout = @deposit.cashouts.build
end
def create
@deposit = current_user.deposit
@cashout = @deposit.cashouts.build(cashout_params)
@cashout.save
if @cashout.save
flash[:success] = "Your order request has been sent!"
redirect_to '/deposit'
else
flash[:error] = "Your order request hasn't been sent!"
redirect_to '/deposit'
end
end
def show
@deposit = Deposit.find(params[:id])
@deposit.cashout
end
private
def cashout_params
params.require(:cashout).permit(:order_sum)
end
end
收入.rb
class Income < ActiveRecord::Base
belongs_to :deposit
validates :deposit_id, :order_sum, presence: true
validates :order_sum, numericality: true
validates :order_sum, numericality: { greater_than_or_equal_to: 0}
after_create :update_deposit_income
private
def update_deposit_income
@deposit = self.deposit
if @deposit.income == nil
@income = 0
else
@income = @deposit.income
end
@deposit.update_attributes(:income => @income + self.order_sum)
end
end
收入 Controller .rb
class IncomesController < ApplicationController
before_action :signed_in_user, only: [:create]
def new
@income = @deposit.incomes.build
end
def create
@user = current_user
@deposit = @user.deposit
@income = @deposit.incomes.build(income_params)
@income.save
if @income.save
flash[:success] = "Your order request has been sent!"
redirect_to '/deposit'
else
flash[:error] = "Your order request hasn't been sent!"
redirect_to '/deposit' if current_user.present?
end
end
def show
@deposit = Deposit.find(params[:id])
@deposit.income
end
private
def income_params
params.require(:income).permit(:order_sum)
end
end
我的错误在哪里?
最佳答案
stack level too deep
错误通常是因为您的代码陷入了循环:要么是一个方法调用自身,要么是两个方法反复相互调用。
在您的情况下,我认为这是由 validate_order
方法引起的。您在 before_save
回调中调用它,该方法调用 self.save
,这将触发回调,这将再次调用该方法,这将再次保存,这会触发回调等等。
想一想 - 将对象保存为“before_save”功能的一部分没有意义,对吗?
我怀疑你想做的只是验证对象,如果验证失败,无论如何都会自动阻止保存。像这样
validate :validate_order
def validate_order
@deposit = self.deposit
@income = @deposit.income
@cashout = self.order_sum
if @income - @cashout <= 0
self.errors.add(:deposit, "is too small")
end
end
这只是一个示例,因为我不知道您正在测试的实际逻辑应该是什么。
关于ruby-on-rails - rails 上的 ruby 。堆栈级别太深错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32045253/