在Play Framework中!我定义了两个模型:
一方面,
@Entity
public class DashboardPosition extends Model {
public int orderId;
@ManyToOne(cascade=CascadeType.ALL)
public Dashboard dashboard;
}
另一方面,
@Entity
public class Dashboard extends Model {
...
}
由于某些原因,当通过"dashboard.delete()“删除仪表板时,我收到以下日志错
从数据库中删除项失败并返回“不能删除或更新父行:外键约束失败”Yii。
deleteAction:
public function run($id)
{
$model = $this->findModel($id);
if ($this->checkAccess) {
call_user_func($this->checkAccess, $this->id, $model);
}
if ($model->delete() === false) {
throw new ServerErrorHtt
简单的问题,假设'dish‘是同一类型的标准对象。为什么推送是不可能的?
class DinnerModel {
constructor() {
this.menu = new Array();
this.dishes = dishesConst;
this.guests = this.setNumberOfGuests(1);
}
addDishToMenu(dish) {
menu.push(dish);
}
我得到了错误消息:
ReferenceError: menu is not defined
at Dinne
我从下载了源代码。当我运行make时,会收到以下错误消息:
make: Entering directory `/home/christopher/SourceCode/svm-python-v204'
cd svm_light; make svm_learn_hideo_noexe
make[1]: Entering directory `/home/christopher/SourceCode/svm-python-v204/svm_light'
make[1]: Nothing to be done for `svm_learn_hideo_noexe'.
mak
基于问题,我这样做了:
public class ShowTicketPlanning extends javax.swing.JFrame {
private static String prevTicket="";
private static int color=1;
public ShowTicketPlanning() {
initComponents();
for (int i = 0; i < C.GameList.size(); i++) {
gameSelectGameCB
Building in workspace /data/www/wdqk/html/flash
Updating svn://192.168.1.200/wdqk/www/html/flash at revision '2013-09-17T15:15:15.460 +0800'
Workspace appear to be locked, so getting a fresh workspace
Cleaning local Directory .
java.io.IOException: Unable to delete /data/www/wdqk/html/flash/
我有一个TableViewController,我有一个可以扩展的UITableViewCell。当它展开时,我想保存用UIBarButtonItem设置的数据,所以这个按钮将调用保存方法。我试图将它保存在我的ViewController实现文件中,但是我总是收到一个错误消息:
'NSInvalidArgumentException', reason: 'Cannot create an NSPersistentStoreCoordinator with a nil model'
我将所有基本代码从另一个项目中复制到我的AppDelegate实现文件中,该项目只
我在node.js/press.js中有以下代码:
var User = mongoose.model('User');
var usersRouter = express.Router();
usersRouter.put('/:id', function(req, res) {
req.body._id = req.params.id;
var usr = new User(req.body);
usr.validate(function (err) {
if (err) {
res.stat
我有模特,
class Profile(models.Model)
user = models.OneToOneField(User)
我的序列化程序类是,
class UserSerializer(serializers.ModelSerializer):
def validate(self, attrs):
print(self.instance) # Always prints None
print(self.parent.instance.user) # Prints User instance
return attrs
我正在尝试用给定的数据来拟合下面的方程。这个方程式是Rate=k*Concentration^n。我遇到了麻烦,因为n在安装时是-6的,这是不可能的,所以我试图在min=0设置一个界限。但是,我得到了一个未定义的术语参数错误。任何帮助都是非常感谢的。
from IPython import get_ipython
get_ipython().magic('reset -sf')
import numpy as np
from lmfit import Model
import matplotlib.pyplot as plt
# Homework Problem #2