Replace an Dictionary object in Array using NSPredicate - ios

Question

I have one dictionary object in Array.
I want to replace this object with new dictionary.
Both have same order_id.
Currently I am doing it like, How can I do it with NSPredicate.
NSMutableArray *orderList=[[NSUserDefaults standardUserDefaults] objectForKey:#"Orders"];
//2. Find and replace the object/OrdeDetails.
for(int i=0;i<orderList.count;i++){
NSDictionary *dictionary=orderList[i];
if([dictionary[#"order_id"] isEqualToString:OrderDetails[#"order_id"]]){
[orderList replaceObjectAtIndex:i withObject:OrderDetails];
break;
}
}

Answer 1

Check this code:
NSPredicate *resultPredicate = [NSPredicate
predicateWithFormat:#"SELF.order_id contains[cd] %#",OrderDetails[#"order_id"]];
NSMutableArray *arrOrders = [[NSMutableArray alloc]init];
[arrOrders addObjectsFromArray:[[NSUserDefaults standardUserDefaults] objectForKey:#"Orders"]];
NSArray *filteredOrder = [arrOrders filteredArrayUsingPredicate:resultPredicate];
if ([filteredOrder count] > 0) {
NSUInteger index = [arrOrders indexOfObject:[filteredOrder objectAtIndex:0]];
if (index != NSNotFound) {
[arrOrders replaceObjectAtIndex:index withObject:OrderDetails];
}
}

Answer 2

You cannot replace an object with NSPredicate you can however search for it then do the replacement afterwards.
Well just made this up without testing but I do think it has a valid syntax.
You can use this as the foundation or hope you get the logic in using the predicate.
// construct the predicate with the given condition
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"order_id = %#",dictionary[#"order_id"]];
// this will filter the array according to the given predicate. if there are more than 1 entries with the given condition then you should handle that this only handle unique entries
NSArray *array = [orderList filteredArrayUsingPredicate:predicate];
// assuming that order_id is unique
NSInteger index = [orderList indexOfObject:[array lastObject]];
if (index != NSNotFound) // check if index is existing
[orderList replaceObjectAtIndex:index withObject:orderDetails]; // replace the object with the desired object

Answer 3

If I want to match perfect then I used, LIKE. Although I am not sure.
Got from the linkcheat sheet
NSPredicate *predicateSearchOrder=[NSPredicate predicateWithFormat:#"SELF.order_id LIKE[cd] %#",[responsedDict valueForKey:#"order_id"]];
//
// //It will be only one object with order id.
NSArray *searchedArray=[orderList filteredArrayUsingPredicate:predicateSearchOrder];
if(searchedArray.count>0){
NSDictionary *toModiFyDictionary=searchedArray[0];
toModiFyDictionary=OrderDetails;
}
This is also working

Answer 4

If you were using Swift, It's very simple.
public class Test : NSObject {
class func test() -> Void {
var array : [Dictionary<String, String>] = []
let dic: Dictionary<String, String> = ["order_id" : "111", "name" : "good1"]
let dic2: Dictionary<String, String> = ["order_id" : "222", "name" : "good2"]
let dic3: Dictionary<String, String> = ["order_id" : "111", "name" : "good3"]
array.append(dic)
array.append(dic2)
let result = array.map { (elem) -> [String : String] in
if elem["order_id"] == "111" {
return dic3
}
return elem
}
print("result = \(result)")
}
}