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Common Yii questions

Revision #18 has been created by dckurushin on Oct 19, 2011, 11:28:13 PM with the memo:

Trying get uploaded file via CUploadedFilee::getInstanceByName() and getting null every time
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Common Yii questions

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FAQs

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yii, common, questions, beginners

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[...]
)
)
)->execute();
```

<hr/>
 
 
### How to use model()->find() / model()->findAll()
 
 
#### Answer:
 
There are three ways:<br>
 
First CdbCriteria:
 
 
```php 
$criteria = new CDbCriteria();
 
$criteria->compare('first_name', 'Paul');
 
$criteria->compare('last_name', 'Smith');
 
$users = User::model()->findAll($criteria);
 
```
 
 
Second:
 
 
 
```php 
User::model()->findAll('first_name=? AND last_name=?', array('Paul', 'Smith'));
 
```
 
 
Third:
 
 
 
```php 
User::model()->findAllByAttributes(array('first_name'=>'Paul', 'last_name'=>'Smith'));
 
```
 
 
The result will be collection of models, to get an array you can use DAO or QueryBuilder
 
 
<hr/>
 
 
### Property ClassName.xxx is not defined , what is the problem?
 
 
#### Answer:
 
First of all, actually the error message say all what you need to know!
 
 
This is very common error in component configuration, and widget configuration.
 
This is not a framework issue!
 
 
To solve it, you should make sure that the **ClassName** has a field with the name you are trying to use.
 
This can be a capital letter issue, or just the property aka field not exists in the class...
 
 
Read the class reference to see if there is a property that you want to use, or if this is an extension or widget - open the class file, and see if there is the property and you spelled it well
 
 
for example if this is the class:
 
 
 
```php 
class Foo{
 
    public $bar = 123;
 
}
 
```
 
 
And you trying to access **Foo.bor** , it not exists there!
 
 
See also: [1](http://www.yiiframework.com/forum/index.php?/topic/16190-property-is-not-defined/ "")
 
[2](http://www.yiiframework.com/forum/index.php?/topic/8054-property-usersalt-is-not-defined/ "")
 
[3](http://www.yiiframework.com/forum/index.php?/topic/5209-gathering-tabular-input-property-item-is-not-defined/ "")
 
[4](http://www.yiiframework.com/forum/index.php?/topic/3452-property-productcontroller-locale-is-not-defined/ "")
 
[5](http://www.yiiframework.com/forum/index.php?/topic/2378-property-cmysqltableschema-primarykey-is-not-defined/ "")
 
 
<hr/>
 
 
### Trying get uploaded file via CUploadedFilee::getInstanceByName() and getting null every time
 
 
#### Answer:
 
I will just show you working example:
 
 
 
 
```php 
//this is how to get the file
 
$file = CUploadedFile::getInstanceByName('data');
 
//upload form
 
CHtml::beginForm('', 'post',array('enctype'=>'multipart/form-data'));
 
//the file field
 
CHtml::fileField('data', '');
 
```
 
 
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Viewed: 58 011 times
Version: 1.1
Category: FAQs
Tags: beginners, common, questions, Yii
Written by: dckurushin
Last updated by: migajek
Created on: Oct 17, 2011
Last updated: 12 years ago
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