SectionedResults-10

SectionedResults.swift

import SwiftData

struct SectionedResults<SectionIdentifier, Result>: RandomAccessCollection
where SectionIdentifier: Hashable, Result: PersistentModel {
    
    // ...
    
    init(sectionIdentifier: KeyPath<Result, SectionIdentifier>,
         results: [Result]) {
        let groupedResults = Dictionary(grouping: results) { result in
            result[keyPath: sectionIdentifier]
        }

        let identifiers = results.map { result in
            result[keyPath: sectionIdentifier]
        }.uniqued()
        
        self.elements = identifiers.compactMap { identifier in
            guard let elements = groupedResults[identifier] else { return nil }
            return Section(id: identifier, elements: elements)
        }
    }

    // ...

}