Swiftlint warning : For Where Violation: `where` clauses are preferred over a single `if` inside a `for`. (for_where)

The syntax preferred by your swiftlint configuration is:

for settingsKeys in searchResults where settingsKeys.key == settingsObject.key {
    settingsKeys.value = settingsObject.value
    try context.save()
}

Which is the similar to

for settingsKeys in (searchResults.filter { $0.key == settingsObject.key }) {
    settingsKeys.value = settingsObject.value
    try context.save()
}

If you know there is only one result with the same key, you might directly use

if let settingsKeys = (searchResults.first { $0.key == settingsObject.key }) {
    settingsKeys.value = settingsObject.value
    try context.save()
}

Looks like it's expecting the where to be part of the for…

for settingsKeys in searchResults where settingsKeys.key == settingsObject.key {
    settingsKeys.value = settingsObject.value
    try context.save()
}