This is the core code.

func testLogDeletion() throws {
    let todo = Todo(type: .habit)
    for _ in 1...10 {
        let log = Log(fid: todo.id, title: todo.title, date: .now)
        context.insert(log)
    }
    let logs = context.fetchLogs(fid: todo.id)
    XCTAssertEqual(logs.count, 10, "There are already 10 habit logs.")
    let fid = todo.id
    try! context.delete(model: Log.self, where: #Predicate { $0.fid_ == fid })
    let logs1 = context.fetchLogs(fid: todo.id)
    XCTAssertEqual(logs1.count, 0, "All 10 habit logs have been deleted.")  // ERROR: still 10 logs
}

function context.delete(model: , where:) doesn’t work, and I found that context.delete(log) can work.

When I run my demo on a real device, everything works fine, but I don’t know where the problem lies. Has anyone encountered the same issue?