public async Task <(int, int, int)> InsertInstances(List <CourseInstance> courseInstances)
{
int newCourses = 0;
int newCourseInstances = 0;
foreach (CourseInstance c in courseInstances)
{
bool courseExists = false;
bool courseInstanceExists = false;
(c.Course, courseExists) = await _courseRepository.AddIfNotExists(c.Course);
courseInstanceExists = (await _courseInstanceRepository.AddIfNotExists(c)).exists;
if (!courseExists)
{
newCourses++;
}
if (!courseInstanceExists)
{
newCourseInstances++;
}
}
return(newCourses, newCourseInstances, (courseInstances.Count - newCourseInstances));
}
