REST get resource by two ids -

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i have 2 entities: articles , users. users may write comment articles, specified user may write 1 comment specified article. so, comment can identified article_id , user_id.

the classic rest request comment is: /comment/:id. in case don't have comment_id because useless. think /comment/:article_id/:user_id or /comment/:article_id!:user_id requests.

what best practice such cases?

i wouldn't call missing commentid 'useless', situation when need it. if @ possible, should create surrogate primary key (with no business meaning , created automatically db) in comments table - instead of compound key of userid + articleid.

this allow more flexibility when/if requirements change. perhaps users allowed post more comments or comments need threaded.

if database unchangeable legacy, agree urls given @gerino


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