CGRIDVIEW TWO TABLES DATA DISPLAY IN YII - yii

Question

i have 2 tables (STUDENT AND EMPLOYEE)
student(reg_no , s_name, dept, f_name) reg_no is primary key
employee(e_no,design,salary,reg_no) reg_no is foreign key reference student(reg_no).
i want to display e_no,design from employee
and s_name,dept from student table.
so my complete cgridview would be
e_no, design,s_name,dept
my code for employee/admin.php
<?php $this->widget('zii.widgets.grid.CGridView', array(
'id'=>'employee-grid',
'dataProvider'=>$model->searchEmployees(),
//'filter'=>$model,
'columns'=>array(
'e_no',
'e_name',
'design',
'salary',
'reg_no',
array('name'=>'student.s_name', 'value'=>'$data->student->s_name'), // student name
'salary', // employee.salary
array(
'class'=>'CButtonColumn',
),
),
));
?>
my code for model/employee.php for searchEmployees()
public function searchEmployees()
{
$criteria=new CDbCriteria;
$criteria->alias = 'i';
$criteria->compare('e_no',$this->e_no);
$criteria->compare('e_name',$this->e_name,true);
$criteria->compare('design',$this->design,true);
$criteria->compare('salary',$this->salary);
$criteria->compare('reg_no',$this->reg_no);
$criteria->join= 'JOIN student d ON (i.reg_no=d.reg_no)';
return new CActiveDataProvider($this, array(
'criteria'=>$criteria,
'sort'=>array(
'defaultOrder'=>'reg_no ASC',
),
));
}
BUT I FACE ERROR
Property "Employee.studentname" is not defined.
HOW TO SOLVE THE ERROR PLZ HELP.
THANKS

Answer 1

You can configure the cgridview to display information for related records using CActiveRecord->getRelated in your customization of columns... it'd be as follows:
student(reg_no , s_name, dept, f_name) would be model Student.
employee(e_no,design,salary,reg_no) would be model Employee.
Employee.e_no, Employee.design, Student.s_name and Student.dept are your desired values so your columns array should be:
<?php
$this->widget('zii.widgets.grid.CGridView', array(
'id'=>'student-grid',
'dataProvider'=>Student::model()->search(),
//'filter'=>$model,
'columns'=>array(
array(
'header'=>Employee::model()->getAttributeLabel('e_no'), //column header
'value'=>'$data->getRelated('employee')->e_no', //column name, php expression
'type'=>'raw',
),
array(
'header'=>Employee::model()->getAttributeLabel(\'design\'), //column header
'value'=>'$data->getRelated(\'employee\')->design', //column name, php expression
'type'=>'raw',
),
's_name',
'dept',
),
));
?>
Notice how related record data is done in the 'value' specification of a custom column, and that the argument to getRelated() is the name of the relationship defined to the Employee model defined in the Student->relations() method. Also check CGridView documentation on columns for more info on how this works.
Update: You can easily switch the approach of this CGridView instantiation to use an Employee instead of a Student and still display the same info by changing the columns array.
Update 2: You can easily handle non existing relationships in the columns array:
'columns'=>array(
array(
'header'=>Employee::model()->getAttributeLabel('e_no'), //column header
'value'=>'($data->getRelated(\'employee\')=== null)?'No related employee registry':$data->getRelated('employee')->e_no', //column name, php expression
'type'=>'raw',
),
array(
'header'=>Employee::model()->getAttributeLabel(\'design\'), //column header
'value'=>'($data->getRelated(\'employee\')=== null)?'No related employee registry':$data->getRelated(\'employee\')->design', //column name, php expression
'type'=>'raw',
),
's_name',
'dept',
),
With this tweaks in the 'value' fields of our members in 'columns' we display a small message whenever the model tries to access a related model. getRelated() returns the related record(s) or null if none is found. Maybe you have Students an equivalent Employee model, which might be the cause of the error. I hope the above helps you resolve it.