Filter array of objects if property value exists in another array of objects swift

Question

I have two array of objects that look like this:

MeetingRoomSuggestions:

init(suggestionReason: String, organizerAvailability: String,
startTime: String, endTime: String, dStart: Date, availability: String,
emailAddress: String, displayName: String, roomEmail: String,
occupancy: Int, building: String)

and Bookings:

init(startTime: String, endTime: String, dStart: Date, organizer :
String, location : String, subject : String)

I want to be able to filter / exclude MeetingRoomSuggestion objects from my array if the dStart property exists in the Bookings array.

My Code:

  let filteredArr = meetingRoomSuggestions.filter { meeting in
        return bookingArray!.contains(where: { booking in
            return booking.dStart == meeting.dStart
        })
    }

I also tried filtering on the start string - which is the same in both. When I print out both the arrays before filtering - you can clearly see there is a booking that exists with the same dStart. How can I exclude this?

After filtering and printing out using the code:

print("meetings:")
        for meeting in self.meetingRoomSuggestions {
            print(meeting.roomEmail)
            print(meeting.dStart)
            print(meeting.startTime)
        }
        print()
        print("bookings:")
        for booking in self.bookingArray! {
            print(booking.location)
            print(booking.dStart!)
            print(booking.start)
        }            

        print("filtered array: ", filteredArr)

        for items in filteredArr {
            print("email: ", items.roomEmail)
            print("dstart: ", items.dStart)
        }

Returns:

    meetings:
[email protected]
2019-02-20 15:00:00 +0000
2019-02-20T15:00:00.0000000
[email protected]
2019-02-20 15:00:00 +0000
2019-02-20T15:00:00.0000000

bookings:
[email protected]
2019-02-20 15:00:00 +0000
2019-02-20T15:00:00.0000000
[email protected]
2019-02-21 10:00:00 +0000
2019-02-21T10:00:00.0000000
[email protected]
2019-02-21 16:00:00 +0000
2019-02-21T16:00:00.0000000

filtered array:  [QUBook.MeetingSuggestion, QUBook.MeetingSuggestion]
email:  [email protected]
dstart:  2019-02-20 15:00:00 +0000
email:  [email protected]
dstart:  2019-02-20 15:00:00 +0000

For some reason, the filtered array is the same as the original meetingRoomSuggestions array - it doesn't filter out the occurrence of an object with the same dStart. I suspect the filter is wrong? I have previously been able to filter array of objects by comparing them with array of strings etc but not like this.

In MeetingRoomSuggestions init where are you initializing dstart ?? — Pankaj Teckchandani
– Pankaj Teckchandani, Commented Feb 20, 2019 at 14:32

pckill · Accepted Answer · 2019-02-20 15:02:16Z

7

You are using some kind of reverse logic here. What you should be doing is this:

let filteredArr = meetingRoomSuggestions.filter { meeting in
    return !bookingArray.contains(where: { booking in
        return booking.dStart == meeting.dStart
    })
}

In plain english: filter meetings, leaving those that do not have their dStart values equal to the dStart value of any object in the bookingArray.

answered Feb 20, 2019 at 15:02

pckill

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8 Comments

Liam Over a year ago

edited my answer. I tried this way of filtering firstly and it wouldn't filter out the meeting I wanted.. Does not pick up / filter even though there is a booking with the same dStart? ^ See prints above

pckill Over a year ago

@Liam, I think you forgot the !, as in !bookingArray.contains

pckill Over a year ago

@LeoDabus, well, I do not think so. At least not when explaining something to someone.

pckill Over a year ago

@LeoDabus, no, I would not. This is not a place where it would be elegant, which kinda defeats the only purpose implicit returns have.

pckill Over a year ago

@Liam, sure, feel free to adjust the filter logic according to your requirements

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