yii : 试图获取非对象的属性

Question

好吧，我找到了this，但我看不出与我的错误的关系。我是新手——我知道这个借口是不可接受的，但我先尝试找到解决方案，然后再在这里提问。我希望你能帮助我。

所以我有这段代码，我把这段代码放在视图中：

foreach ($budget as $budget):
            if (array_key_exists('year', $_GET)) {
                $criteria = new CDbCriteria;
                $criteria->condition = 'year = ' . $_GET['year'];
                $criteria->addCondition('mapping_id = '. $budget->id);
                $yearBudget = YearlyBudget::model()->find($criteria);
            } else {
                $yearBudget = new YearlyBudget;
            } 
 endforeach;

然后在那段代码之后，我简单地回显这个：

echo $yearBudget->budget;

然后我得到了非对象错误。我只是不明白并停留在这段代码中。请帮忙，谢谢。

print_r($yearBudget); ：

YearlyBudget Object(
[_new:CActiveRecord:private] => 
[_attributes:CActiveRecord:private] => Array
    (
        [id] => 1
        [mapping_id] => 1
        [year] => 2012
        [budget] => 2000000
        [balance] => 2000000
        [created] => 2013-11-20 10:16:29
        [updated] => 
    )

[_related:CActiveRecord:private] => Array
    (
    )

[_c:CActiveRecord:private] => 
[_pk:CActiveRecord:private] => 1
[_alias:CActiveRecord:private] => t
[_errors:CModel:private] => Array
    (
    )

[_validators:CModel:private] => 
[_scenario:CModel:private] => update
[_e:CComponent:private] => 
[_m:CComponent:private] => 

)

啊，对不起，如果我的英语不好..

Answer 1

在访问它的属性之前检查对象是否为空。

if($yearBudget){
  echo $yearBudget->budget;
}else{
  echo "No Yearly Budget with given criteria";
}

如果您没有得到想要的结果，请仔细检查条件

$criteria->condition = 'year = ' . $_GET['year'];
$criteria->addCondition('mapping_id = '. $budget->id);

Answer 2

我强烈建议使用CHtml::value() 方法http://www.yiiframework.com/doc/api/1.1/CHtml#value-detail

echo CHtml::value($yearBudget, 'budget');

这在涉及多个相关对象时非常方便，您无需检查每个相关模型的存在来访问其属性

echo CHtml::value($budget, 'company.fiscalYear.creator.id');

Answer 3

在尝试使用您的标准找到模型后，您需要确保您拥有一个有效的模型：

foreach ($budget as $budget):
            if (array_key_exists('year', $_GET)) {
                $criteria = new CDbCriteria;
                $criteria->condition = 'year = ' . $_GET['year'];
                $criteria->addCondition('mapping_id = '. $budget->id);

                if(YearlyBudget::model()->exists($criteria)) // check if this exists
                    $yearBudget = YearlyBudget::model()->find($criteria);
                else
                    $yearBudget = new YearlyBudget; // or throw an exception or something
            } else {
                $yearBudget = new YearlyBudget;
            } 
 endforeach;