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The course group aggregate only consist of the entity Course, which is a non-singleton. The create service for the aggregate CourseGroup is defined in such a way, that it is possible to save more than one course in such an aggregate. An exposed flow CourseGroupManagement is available to manage course group aggregates, as shown below.
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A course has a duration in number of days and a price in euros. Custom metadata fields have been defined within the course group aggregate to summarize the number of days and the price and count the number of courses for each course group aggregate. Versioning has been disabled in this part of the example, so only the latest version of each aggregate is available.
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