iOS- swift 3- Nested sorting and union with flatmap, map, filter or formUnion - dictionary

Question

class Flight{
var name:String?
var vocabulary:Vocabulary?
}
class Vocabulary{
var seatMapPlan:[Plan] = []
var foodPlan:[Plan] = []
}
class Plan{
var planName:String?
var planId:String?
}
var flightList:[Flight] = []
var plan1 = Plan()
plan1.planId = "planId1"
plan1.planName = "Planname1"
var plan2 = Plan()
plan2.planId = "planId2"
plan2.planName = "Planname2"
var plan3 = Plan()
plan3.planId = "planId3"
plan3.planName = "Planname3"
var plan4 = Plan()
plan4.planId = "planId4"
plan4.planName = "Planname4"
var plan5 = Plan()
plan5.planId = "planId5"
plan5.planName = "Planname5"
var plan6 = Plan()
plan6.planId = "planId6"
plan6.planName = "Planname6"
var flight1 = Flight()
flight1.name = "Flight1"
flight1.vocabulary = Vocabulary()
flight1.vocabulary?.seatMapPlan = [plan1, plan2]
flight1.vocabulary?.foodPlan = [plan3, plan4, plan5]
var flight2 = Flight()
flight2.name = "Flight2"
flight2.vocabulary = Vocabulary()
flight2.vocabulary?.seatMapPlan = [plan2, plan3]
flight2.vocabulary?.foodPlan = [plan3, plan4, plan5]
flightList=[flight1, flight2]
Problem 1:
I want to use flatmap,filter,custom unique func or Sets.formUnion to achieve a union of seatMapPlans. For this particular example it is
seatMapUnion = [plan1,plan2,plan3]
Because of nesting with the help of answered questions I am unable to achieve this.
Please give me a combination of filter,flatMap and map for resolving this particular problem.
Problem 2:
I have vice-versa scenarios too were i have to sort this array flightList on basis of plan(plan1 or multiple) selected. I want to sort this on basis of filter and map, but the nesting is making it difficult to achieve.
e.g. 1:
if the search parameter is plan1 for seatMapPlan. Then the result is flight1.
e.g. 2:
And if the search parameter is plan2 for seatMapPlan. Then the result is flight1,flight2.

Answer 1

For the first problem I would use sets. So first make Plan implement Hashable :
class Plan : Hashable {
var planName:String?
var planId:String?
public var hashValue: Int { return planName?.hashValue ?? 0 }
public static func ==(lhs: Plan, rhs: Plan) -> Bool { return lhs.planId == rhs.planId }
}
Then it's straightforward :
let set1 = Set<Plan>(flight1.vocabulary!.seatMapPlan)
let set2 = Set<Plan>(flight2.vocabulary!.seatMapPlan)
let union = set1.union(set2)
print(union.map { $0.planName! } )
It'll print:
["Planname2", "Planname1", "Planname3"]
Not sure I understand your second problem.