ios developer ios developer - 1 month ago 9
iOS Question

Remove duplicate from nsmutablearray containing nsdictionary

I want to remove duplicates from nsmutablearray.

Array Structure :-


(
{
"act_end_date" = "";
"act_entry_date" = "13/11/2014";
"act_recurrrance_type" = Daily;
"act_start_date" = "2014-11-13";
"row_id" = 0;
"act_id" = 2;
}
{
"act_end_date" = "";
"act_entry_date" = "13/11/2014";
"act_recurrrance_type" = Daily;
"act_start_date" = "2014-11-13";
"row_id" = 1;
"act_id" = 2;
}
{
"act_end_date" = "";
"act_entry_date" = "16/11/2014";
"act_recurrrance_type" = Daily1;
"act_start_date" = "2014-11-15";
"row_id" = 2;
"act_id" = 3;
}
)



What I want is to check where array contain any dictionary which have same act_id.
If yes then remove 1st dictionary.
i.e the expected result for the above arrayis :-

(
{
"act_end_date" = "";
"act_entry_date" = "13/11/2014";
"act_recurrrance_type" = Daily;
"act_start_date" = "2014-11-13";
"row_id" = 1;
"act_id" = 2;
}
{
"act_end_date" = "";
"act_entry_date" = "16/11/2014";
"act_recurrrance_type" = Daily1;
"act_start_date" = "2014-11-15";
"row_id" = 2;
"act_id" = 3;
}
)


Is their any way?
Is it possible by using NSPREDICATE?

I Tries to do it in below way :-

NSMutableArray *filteredArray = [NSMutableArray array];

for (NSMutableDictionary* E1 in Event_Array)
{

BOOL hasDuplicate = [[filteredArray filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"act_id == %@", [E1 objectForKey:@"act_id"]]] count] > 0;

if (!hasDuplicate)
{
[filteredArray addObject:E1];
}
}


For it returns array :---

(
{
"act_end_date" = "";
"act_entry_date" = "13/11/2014";
"act_recurrrance_type" = Daily;
"act_start_date" = "2014-11-13";
"row_id" = 0;
"act_id" = 2;
}
)


What i want is

(
{
"act_end_date" = "";
"act_entry_date" = "13/11/2014";
"act_recurrrance_type" = Daily;
"act_start_date" = "2014-11-13";
"row_id" = 1;
"act_id" = 2;
}
)

Answer

Assuming you want the latest object to be in the list.

Solution 1: (Simple)

Reverse your array

NSMutableArray *filteredArray = [NSMutableArray array];
for (int i = Event_Array.count-1; i>= 0; i--)
{
    NSMutableDictionary* E1 = [Event_Array objectAtIndex:i];
    BOOL hasDuplicate = [[filteredArray filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"act_id == %@", [E1 objectForKey:@"act_id"]]] count] > 0;

    if (!hasDuplicate)
    {
        [filteredArray addObject:E1];
    }
}

Solution 2:

Use NSMutableDictionary instead of array.

//Keys are act_id(s)
"2" = {
    "act_end_date" = "";
    "act_entry_date" = "13/11/2014";
    "act_recurrrance_type" = Daily;
    "act_start_date" = "2014-11-13";
    "row_id" = 1;
    "act_id" = 2;
};
"3" = {
    "act_end_date" = "";
    "act_entry_date" = "16/11/2014";
    "act_recurrrance_type" = Daily1;
    "act_start_date" = "2014-11-15";
    "row_id" = 2;
    "act_id" = 3;
}
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