java - How to deal with aggregation and composition in RESTful web service -


i have created following entities, book, chapter , feedback. book have many chapter entities, , have many feedback entities. since no chapter entities live them self part of book composition. same applies feedback entitiy.

my question whether objects part of composition should have own uris in restful system? such as:

/books/1/chapters (with post, delete, put operations)  /books/1/feedback (with post, delete, put operations)

or should threated this:

/books/1 (with post, delete, put operations on book)

the last uri mean users of api have add feedback array of book , update whole book entity.

and make sense call relationship between books , chapters "composition + aggregation" since chapters doesn't belong other object , life cycle dependent of book?

my question whether objects part of composition should have own uris in restful system

yes, definitely. makes significantly easier access , manage specific parts of entity representation when parts independently addressable. rather requiring clients retrieve whole representation each time update small portions of it, can focus on 1 part needs modified. simplifies access control, endpoints may available particular callers not others.

the 1 constraint kept when defining sub-resource uri's defined within scope of parent resource (as showing in example).

and make sense call relationship between books , chapters "composition + aggregation" since chapters doesn't belong other object , life cycle dependent of book

it makes sense refer relationship composition. aggregation mean sub-resource (chapter) exist outside scope of parent (book), in case cannot. example of aggregation address, associated person, or organization.


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