magento adding custom column to eav_attribute table - magento

Question

I want adding my custom field(column in database) to table eav_attribute
this is my configuration models and resource in t
<models>
<mycompany_filters>
<class>Mycompany_Filters_Model</class>
<resourceModel>mycompany_filters_resource</resourceModel>
</mycompany_filters>
<mycompany_filters_resource>
<class>Mycompany_Filters_Model_Resource</class>
</mycompany_filters_resource>
</models>
<resources>
<mycompany_filters_setup>
<module>Mage_Eav</module>
<module>Mage_Eav_Model_Entity_Setup</module>
</mycompany_filters_setup>
</resources>
directory tree
sql
-- mycompany_filters_setup
-- install-0.1.4.php
and content file install-0.1.4.php
<?php
$installer = $this;
/* #var $installer Mage_Eav_Model_Entity_Setup */
$installer->startSetup();
$installer->getConnection()->addColumn(
$installer->getTable('eav/attribute'),
"is_used_in_category",
"TINYINT( 1 ) UNSIGNED NOT NULL DEFAULT '0'"
);
$installer->endSetup();
but this doesn't work. In table core_resource not create string resource for mycompany_filters and in table eav_attribute don't created new column.
Error logs: system.log and exception.log apache2 log is empty
Main question why is doesn't work?

Answer 1

I would like to point out a few things I think is wrong here.
First your config.xml:
<models>
<mycompany_filters>
<class>Mycompany_Filters_Model</class>
<resourceModel>mycompany_filters_resource</resourceModel>
</mycompany_filters>
<mycompany_filters_resource>
<class>Mycompany_Filters_Model_Resource</class>
</mycompany_filters_resource>
</models>
<resources>
<mycompany_filters_setup>
<module>Mage_Eav</module>
<module>Mage_Eav_Model_Entity_Setup</module>
</mycompany_filters_setup>
</resources>
Should really be:
<models>
<mycompany_filters>
<class>Mycompany_Filters_Model</class>
<resourceModel>mycompany_filters_resource</resourceModel>
</mycompany_filters>
<mycompany_filters_resource>
<class>Mycompany_Filters_Model_Resource</class>
</mycompany_filters_resource>
</models>
<resources>
<mycompany_filters_setup>
<setup>
<module>Mage_Eav</module>
<class>Mage_Eav_Model_Entity_Setup</class>
</setup>
<!-- You could add these as well
<connection>
<use>core_setup</use>
</connection>
-->
</mycompany_filters_setup>
<!-- If you add the connection tag above, you should add these as well
<filters_write>
<connection>
<use>core_write</use>
</connection>
</filters_write>
<filters_read>
<connection>
<use>core_read</use>
</connection>
</filters_read>
-->
</resources>
Essentially, you are missing the <setup> tag that should wrap the resources <module> and <class> tags.
The contents of install-0.1.4.php should instead be:
$installer = $this;
$installer->startSetup();
$table = $installer->getTable('eav/attribute');
$installer->getConnection()
->addColumn($table, 'is_used_in_category', array(
'type' => 'could be Varien_Db_Ddl_Table::TYPE_TEXT or any you want it should be',
'nullable' => true, //could be true or false
'default' => null, //default value for this attribute
'unique' => true, //could be true or false
'comment' => 'Your comment here. Not important'
));
$installer->endSetup();
In your config.xml, make sure the version declared is same as 0.1.4. Clear your CACHE after these changes and run your application.
Hope it helps.