CODEWITHSUNDEEP
iosobjective-cpointersnsarray
mamadoo
mamadoo

Reputation: 43

copy nsobject custom class to array after edit it's properties

I do have a problem editing my custom class objects, I do have a custom class of product, when i pass it through next view where i can fix it's quantity and save it to my appdelegate array, everything OK! But if I try to add the same product with another quantity to same array, first object get overwritten and i do get second object twice in my array with same property values, my code is to messy to past it here, so here an pseudo example of problem:

view A: list of products

class product:
title
quantity

View B: product details
set quantity


let's say I choose product apple:
in view B quantity set to 2
added to array


if I select product apple again
set quantity to 1
added to array

as result I do get an array of 2 objects:
-apple quantity 1
-apple quantity 1

any help appreciated,

Upvotes: 0

Views: 224

Answers (1)

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 727047

The scenario points out to a simple root cause: you are not making a copy of the object before editing it. The two objects in your NSMutableArray are actually the same object.

It is hard to identify the problem without seeing the relevant code. However, you need to make sure that the products and quantities are not stored in the same object:

@interface Product
@property NSString *name;
@property NSDecimal *price;
@end

@interface OrderEntry
@property Product *product;
@property int quantity;
@end

You should be adding OrderEntry objects to your NSMutableArray. Each time that you add a new entry a new OrderEntry object needs to be created, rather than modifying an existing one.

Upvotes: 1

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