How to add only one quantity of one product in cart in opencart website - opencart2.x

I am using opencart 2.0. I want to add only one quantity of one product in a cart and if somebody tries to add same product in cart which is already in cart, Then there should be custom message on screen.

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What is the best way to create cart in nodejs,expressjs with hbs?

My question meaning is that what should we use to create cart in e-commerce site in nodejs. Should we direct add the data in mongodb or first use to create session from collected items. What should we do. If the session is the best way to create cart then please suggest me a best way to create cart in sessions thanks
Creating an entry in db would be great because you may need to access user cart at any point of time so instead of managing session, managing db would be good idea.
one more suggestion I would like to give is that when user is checking out the cart then before checkout validate the cart.
suppose, user has added any product to the cart and then does not checkout the cart but after some days, user is checking out the cart and the product in the user cart is out of stock then you need to remove that product from user cart or may be the price of that product is changed then also you need to notify user for this before checkout. This type of validations are included in validate cart.
Hope this helps!
Thank you

Programmatically create order in shopware plugin

I need to create ShopWare 6 plugin that creates new orders from products that are received via AJAX POST request. I don't know how to do that. I googled and checked documentation but I couldn't find any info on how can it be done.
Does someone know how can it be done?
In my opinion, the best solution would be to create Cart object from products that you get from request probably you know context token so you can use the current customer's cart and add products to it, but also you can create a new cart and then call \Shopware\Core\Checkout\Cart\Order\OrderPersister::persist() method to persist order from your cart.
Take a look here how to load/create a Cart
\Shopware\Core\Checkout\Cart\SalesChannel\CartLoadRoute::load()

Creating products dynamically in Hybris

We have a hybris set up without any product data,Products are stored in MDM and displayed on front-end using another system(Java app).The request is sent to hybris when the user clicks checkout on the upstream system to create products in Hybris .
Is there an OOTB API in hybris which allows us to create the products with all mandatory fields dynamically.
You have different options to import new products within Hybris :
Use OCC, and update the existing ProductController to have a new API method to add a new product
Use the ant 'importimpex' target (Hybris V6)
Use the hot folder (CSV to Impex)
Use Hybris Data-Hub
Are you using Hybris to place the orders only ? Why are your products not already synchronized with Hybris ?
"we do not want to store any products in Hybris " - You can probably fetch product detail information from MDM, on Demand, either by lazy loading or by the hybris server acting as proxy to the MDM server. You will still need to maintain atleast a few product attributes in Hybris to be able to add a product to a cart/order, like product id or name.

Creating custom product page in drupal 6 using ubercart

I am using drupal 6 and ubercart module for selling products online.
I have created a page content type and in html code i also added a the source of the buy now button from google . Now i want this button to function same as the buy now button works in product content type. Simply redirecting it to cart/checkout doesnt works
First, there's aren't using it's cart.
All your catalogue using Views and CCK.
If you Google buy button is unique foar every good you sell you can jyst create a CCK-field to input it and render on page display.

How to make User Interface of add contact detail same like in iPhone Contact List?

I am making an app, in which I am making custom contact list for this application, now I made add button to add contact in my custom contact list.
Now I want to add all the detail (name, mobile, email, photo etc..) of contact, same like iPhone new contact detail has, and with same userInterface that apple use in add contact...
I think its custom group table view but still I can not get how they use it, and I want to do like exactly same...

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