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I need to check the validity of a coupon code on the checkout/cart page with server-side code.
Magento already ships with a similar check in place. However, I need to add one to see if a user is connected or not: what would be the best way to extend/override that action in Magento?
I know I can copy the controller PHP file to the /app/code/local/ folder tree, but I'm wondering whether there's a better way to do it.
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To override a controller, you have to create a subclass to define existing functions. Now select a function from the controller for overriding from the addons. For better understanding, I have selected the following Carousel Recently viewed function for overriding.
If we want to override controller file in magento 1 then we need to add create custom modules like following: Create a new module and declare it in “app/etc/modules” by adding a xml file.
Override module view-files in the app/code folder. Make the necessary changes to the newly created theme file. If your own theme is missing from your Magento installation, create new theme.
More specifically, in Magento 2, any module's or parent theme's layout, template, or web can be overridden with ease just by placing it in <theme_dir>/<Vendor>_<Module>/path/to/file . For instance, for the Magento_Theme module, you can place your template in <theme_dir>/Magento_Theme/templates/html/header.
Anything besides modifying the core is good in my opinion. With that said create a simple module with a controllers directory and etc with config.xml:
<config>
<frontend>
<routers>
<checkout>
<args>
<modules>
<My_Module before="Mage_Checkout">My_Module_Checkout</My_Module>
</modules>
</args>
</checkout>
</routers>
</frontend>
</config>
See here for more details on how to extend the frontend controller: http://prattski.com/2010/06/24/magento-overriding-core-files-blocks-models-resources-controllers/
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