Searching in Array of Dictionaries - swift

Question

I'm trying to search values in array of dictionaries which I get from JSON. I have a tableViewController with UISearchResultsUpdating. I found an example with array of Strings:
func updateSearchResultsForSearchController(searchController: UISearchController)
{
filteredTableData.removeAll(keepCapacity: false)
let searchPredicate = NSPredicate(format: "SELF contains[c] %#", searchController.searchBar.text)
let array = tableData.filteredArrayUsingPredicate(searchPredicate)
filteredTableData = array as! [String]
self.tableView.reloadData()
}
And I really don't know how to made search in array like this:
(
{
id = 3;
name = TestNewYork;
},
{
id = 2;
name = TestLA;
},
{
id = 1;
name = TestWashington;
}
)
my tableData = [] and filteredTableData must be an array too
Please, help!

Answer 1

You can use a simple filter function to do this...
tableData : [[String : String]] = ... // your JSON array of String, String dictionaries...
filteredTableData = tableData.filter{
dictionary in
return dictionary["name"] == filterString
}
Something like that anyway, not written Swift for a while.
You can wrap it in a function too...
func filter(array : [[String : String]], byString filterString : String) -> [[String : String]] {
return array.filter{
dictionary in
return dictionary["name"] == filterString
}
}
Or something. Not checked the code yet. Will be back if it doesn't work.
Checked in Playground and this works...
UPDATE
Changed to this...
let data = [
[
"id" : 3,
"name" : "a"
],
[
"id" : 4,
"name" : "b"
],
[
"id" : 5,
"name" : "c"
]
]
let filteredData = data.filter{
return $0["name"] == "b"
}
And it works. Just can't work out how to wrap in a function.
If you want to match the beginning of words...
let data = [
[
"id" : 3,
"name" : "Hello"
],
[
"id" : 4,
"name" : "Goodbye"
],
[
"id" : 5,
"name" : "Everybody"
]
]
let filteredData = data.filter{
let string = $0["name"] as! String
return string.hasPrefix("Goo")
}
If you want a contains you just need to do a find in the string.
Again, I'm not lying here. I'm running it in a Playground to check...
For a contains search you can do this...
let filteredData = data.filter{
let string = $0["name"] as! String
return string.rangeOfString("db") != nil
}