async Task EnrollStudent(StudentEnrollCommand command)
{
Student student = await _students.GetStudentAsync(command.StudentEmail);
if (student == null)
{
throw new DomainException($"Student email '{command.StudentEmail}' doens't exist");
}
bool suceed;
do
{
CourseEnrollment enrollment = await _courses.GetCourseEnrollmentAsync(command.CourseTitle);
if (enrollment == null)
{
throw new DomainException($"Course {command.CourseTitle} doesn't exist");
}
int version = enrollment.CourseVersion;
enrollment.AddStudent(student);
suceed = await _courses.SetCourseEnrollmentAsync(version, enrollment);
} while(!suceed);
}
public void AddStudent_Test()
{
var enrollment = new CourseEnrollment(
courseId: "Course_1",
courseVersion: 0,
courseTitle: "Course 1",
capacity: 2,
students: new string[0],
summary: new CourseSummary()
);
var student = TestHelpers.CreateStudent(id: 1, age: 30);
enrollment.AddStudent(student);
enrollment.CourseId.Should().Be("Course_1");
enrollment.CourseVersion.Should().Be(1);
enrollment.CourseTitle.Should().Be("Course 1");
enrollment.Capacity.Should().Be(2);
enrollment.Students.Should().BeEquivalentTo(new[] { "Student_1" });
enrollment.Summary.StudentCount.Should().Be(1);
}