how to join three tables on every time when model load

Author: devamitbera

54946/doc.md

@@ -0,0 +1,74 @@
+In this case,you need make one table primary table and using join function[left join,Inner join] on Resource Model and Resource Model Collection class relation rest of two classes.
+Add Tables into Model Collection :
+
+You need to first work on collection class.Here,you need do add function _afterLoad() on collection class,w using this function you can mapping relation between there table.
+
+On Resource Class : Mynamespace_Mymodule_Model_Resource_Mymodel_Collection
+
+protected function _afterLoad()
+{
+$select= $this->getSelect();
+$select->joinLeft(
+    array('SecondTable'=>$this->getTable('yourmodel/secondtable')),
+    ''Maintable.key=SecondTable.key',
+    array('*')
+);
+
+$select->joinLeft(
+    array('3rdTable'=>$this->getTable('yourmodel/thirdatble')),
+    'Maintable.key=3rdTable.key',
+    array('*')
+);
+return parent::_afterLoad();
+}
+
+afterLoad() trigger a perform a operations after collection load.
+Add Three tables into model
+
+On resource class you need add multiple table using function _getLoadSelect() on Mynamespace_Mymodule_Model_Resource_Mymodel
+
+ protected function _getLoadSelect($field, $value, $object)
+    {
+        $select = parent::_getLoadSelect($field, $value, $object);
+
+        $select->join(
+                array('SecondTable' => $this->getTable('yourmodel/secondtable')),
+               'Maintable.key=SecondTable.key',
+                array());
+
+        $select->join(
+                array('3rdTable' => $this->getTable('yourmodel/thirdatble')),
+               'Maintable.key=3rdTable.key',
+                array());
+
+    return $select;
+    }
+
+If resource collection is not work then try this code at collection.php
+
+Create two individual function.which is include rest of function to collection.
+
+public function addSecondTable(){
+
+$select= $this->getSelect();
+$select->joinLeft(
+        array('SecondTable'=>$this->getTable('yourmodel/SecondTable')),
+        'Maintable.key=SecondTable.key',
+        array('*')
+    return $this;   
+}
+
+public function addThirdTable(){
+
+    $this->getSelect()->joinLeft(
+    array('3rdTable'=>$this->getTable('yourmodel/Thirdatble')),
+    'Maintable.key=3rdTable.key',
+    array('*'));
+    return $this;   
+}
+
+You can use:
+
+$collection = Mage::getResourceModel('mynamespace_mymodule/mymodule_collection');
+$collection->addSecondTable()->addThirdTable();
+

54946/doc.md~

@@ -0,0 +1,74 @@
+In this case,you need make one table primary table and using join function[left join,Inner join] on Resource Model and Resource Model Collection class relation rest of two classes.
+Add Tables into Model Collection :
+
+You need to first work on collection class.Here,you need do add function _afterLoad() on collection class,w using this function you can mapping relation between there table.
+
+On Resource Class : Mynamespace_Mymodule_Model_Resource_Mymodel_Collection
+
+protected function _afterLoad()
+{
+$select= $this->getSelect();
+$select->joinLeft(
+    array('SecondTable'=>$this->getTable('yourmodel/secondtable')),
+    ''Maintable.key=SecondTable.key',
+    array('*')
+);
+
+$select->joinLeft(
+    array('3rdTable'=>$this->getTable('yourmodel/thirdatble')),
+    'Maintable.key=3rdTable.key',
+    array('*')
+);
+return parent::_afterLoad();
+}
+
+afterLoad() trigger a perform a operations after collection load.
+Add Three tables into model
+
+On resource class you need add multiple table using function _getLoadSelect() on Mynamespace_Mymodule_Model_Resource_Mymodel
+
+ protected function _getLoadSelect($field, $value, $object)
+    {
+        $select = parent::_getLoadSelect($field, $value, $object);
+
+        $select->join(
+                array('SecondTable' => $this->getTable('yourmodel/secondtable')),
+               'Maintable.key=SecondTable.key',
+                array());
+
+        $select->join(
+                array('3rdTable' => $this->getTable('yourmodel/thirdatble')),
+               'Maintable.key=3rdTable.key',
+                array());
+
+    return $select;
+    }
+
+If resource collection is not work then try this code at collection.php
+
+Create two individual function.which is include rest of function to collection.
+
+public function addSecondTable(){
+
+$select= $this->getSelect();
+$select->joinLeft(
+        array('SecondTable'=>$this->getTable('yourmodel/SecondTable')),
+        'Maintable.key=SecondTable.key',
+        array('*')
+    return $this;   
+}
+
+public function addThirdTable(){
+
+    $this->getSelect()->joinLeft(
+    array('3rdTable'=>$this->getTable('yourmodel/Thirdatble')),
+    'Maintable.key=3rdTable.key',
+    array('*'));
+    return $this;   
+}
+
+You can use:
+
+$collection = Mage::getResourceModel('mynamespace_mymodule/mymodule_collection');
+$collection->addSecondTable()->addThirdTable();
+