CODEWITHSUNDEEP
core-datansmanagedobjectnsmanagedobjectcontext
Alish
Alish

Reputation: 133

NSManagedObject stop updating

In my model I have: Product <<---> Order

Product Attributes: productName productPrice Product Relationships: order

Order Attributes: orderName salePerson Order Relationships: products

Imagine I have a Product (call it product1): productName: MacBook productPrice: 1200

The application in general used to sale products. So after add and done the sale. Automatically create an Order (call it currentOrder) which contain product1.

[currentOrder addProductsObject:product1];

Next I changed product1 price to: productPrice: 1000

After I recheck the product inside the currentOrder, I'll see the productPrice is UPDATED to: 1000 Which I need to not change and still be exactly like the previous (1200).

Basically I would to do something do NOT update the previous object.

Upvotes: 0

Views: 53

Answers (1)

Mark Kryzhanouski
Mark Kryzhanouski

Reputation: 7241

Your business model is not suitable for your case. You need to have another entity 'Sale' or so. Your model should look like: Order <--->>Sale, Product <---> Sale. Product Attributes: productName. Order Attributes: orderName salePerson Order Relationships: sales. Save Attributes: productPrice Sale Relationships: order. So in this way you decouple price from product and will be able store different prices in different orders.

Upvotes: 3

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