public function updateVirtualRuleBackend(\Magento\Eav\Setup\EavSetup $eavSetup)
    {
        // Fix the attribute backend model.
        $eavSetup->updateAttribute(
            Category::ENTITY,
            'virtual_rule',
            'backend_model',
            null
        );
    }
public function updateVirtualRuleBackend(\Magento\Eav\Setup\EavSetup $eavSetup)
    {
        // Fix the attribute backend model.
        $eavSetup->updateAttribute(
            Category::ENTITY,
            'virtual_rule',
            'backend_model',
            null
        );
    }
public function updateVirtualRuleBackend ( \ Magento \ Eav \ Setup \ EavSetup $ eavSetup ) { // Fix the attribute backend model. $ eavSetup -> updateAttribute ( Category :: ENTITY , 'virtual_rule' , 'backend_model' , null ) ; }
Remove the backend model of the 'virtual_rule' attribute.

@param \Magento\Eav\Setup\EavSetup $eavSetup EAV module Setup

@return void
Remove the backend model of the virtual_rule attribute .