fix: cell configuration

TIEcommerce/Sources/Filters/Protocols/FilterViewModelProtocol.swift

@@ -29,7 +29,6 @@ public protocol FilterViewModelProtocol: AnyObject {
 
     typealias Change = (indexPath: IndexPath, viewModel: CellViewModel)
 
-
     var properties: [Property] { get set }
     var selectedProperties: Set<Property> { get set }
 

TIEcommerce/Sources/Filters/ViewModels/BaseFilterViewModel.swift

@@ -31,8 +31,6 @@ open class BaseFilterViewModel<CellViewModelType: FilterCellViewModelProtocol &
     public typealias Property = PropertyValue
     public typealias CellViewModel = CellViewModelType
 
-    private var cellsViewModels: [CellViewModelType] = []
-
     public var properties: [PropertyValue] = [] {
         didSet {
             filtersCollection?.updateView()
@@ -58,21 +56,28 @@ open class BaseFilterViewModel<CellViewModelType: FilterCellViewModelProtocol &
             .filter { isFilterInArray($0.element, filters: selected) || isFilterInArray($0.element, filters: deselected) }
 
         for (offset, element) in changedFilters {
-            cellsViewModels[offset].isSelected = selectedProperties.contains(element)
+            guard !getCellsViewModels().isEmpty else { return [] }
+
+            setSelectedCell(atIndex: offset, isSelected: selectedProperties.contains(element))
             properties[offset].isSelected = selectedProperties.contains(element)
         }
 
         let changedItems = changedFilters
             .map {
                 Change(indexPath: IndexPath(item: $0.offset, section: .zero),
-                       viewModel: cellsViewModels[$0.offset])
+                       viewModel: getCellsViewModels()[$0.offset])
             }
 
         return changedItems
     }
 
+    open func setSelectedCell(atIndex index: Int, isSelected: Bool) {
+        // override in subclasses
+    }
+
     open func getCellsViewModels() -> [CellViewModelType] {
-        cellsViewModels
+        // override in subclasses
+        return []
     }
 
     // MARK: - Public methods

TIEcommerce/Sources/Filters/ViewModels/DefaultFilterViewModel.swift

@@ -32,4 +32,12 @@ open class DefaultFilterViewModel: BaseFilterViewModel<DefaultFilterCellViewMode
                                        isSelected: $0.isSelected)
         }
     }
+
+    open override func setSelectedCell(atIndex index: Int, isSelected: Bool) {
+        cellsViewModels[index].isSelected = isSelected
+    }
+
+    open override func getCellsViewModels() -> [DefaultFilterCellViewModel] {
+        cellsViewModels
+    }
 }