Symfony / Doctrine - SQL to Entity - symfony

Question

Can someone please help? I'm trying to create shopping cart and have this SQL, but I want it in Entity:
CREATE TABLE `customers` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`email` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`phone` varchar(15) COLLATE utf8_unicode_ci NOT NULL,
`address` text COLLATE utf8_unicode_ci NOT NULL,
`created` datetime NOT NULL,
`modified` datetime NOT NULL,
`status` enum('1','0') COLLATE utf8_unicode_ci NOT NULL DEFAULT '1',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE `products` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(200) COLLATE utf8_unicode_ci NOT NULL,
`description` text COLLATE utf8_unicode_ci NOT NULL,
`price` float(10,2) NOT NULL,
`created` datetime NOT NULL,
`modified` datetime NOT NULL,
`status` enum('1','0') COLLATE utf8_unicode_ci NOT NULL DEFAULT '1',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE `orders` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`customer_id` int(11) NOT NULL,
`total_price` float(10,2) NOT NULL,
`created` datetime NOT NULL,
`modified` datetime NOT NULL,
`status` enum('1','0') COLLATE utf8_unicode_ci NOT NULL DEFAULT '1',
PRIMARY KEY (`id`),
KEY `customer_id` (`customer_id`),
CONSTRAINT `orders_ibfk_1` FOREIGN KEY (`customer_id`) REFERENCES `customers` (`id`) ON DELETE CASCADE ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE `order_items` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`order_id` int(11) NOT NULL,
`product_id` int(11) NOT NULL,
`quantity` int(5) NOT NULL,
PRIMARY KEY (`id`),
KEY `order_id` (`order_id`),
CONSTRAINT `order_items_ibfk_1` FOREIGN KEY (`order_id`) REFERENCES `orders` (`id`) ON DELETE CASCADE ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
How could I create order_items in doctrine? It's many to many relation I think, but with 2 more columns.
Thank you

Answer 1

In Doctrine, if you want to have attributes attached to a Many To Many relationship, simply just create another entity. This entity will have two M-1 relationships linked to the other two entities, in the scenario of your question, you can have an OrderItem entity, which are associated with Orders and Products table via 1-M relationship (basically two foreign keys in SQL) and as many attributes for itself as you want.