ruby on rails - Embedding IDs with active model serializers leaves out key names when using composite primary keys -

i using composite primary keys in ruby on rails api server. using active model serializers manage serialization of models. use embed: :ids feature in serializer embed ids. works composite primary keys, gives id's values. since there multiple ids single record, there no way know value belongs column.

my serializer

class postserializer < activemodel::serializer   attributes :id, :title, :body   has_many :comments, embed :ids end 

resulting json

{   "post": {     "id": 1,     "title": "new post",     "body": "a body!",     "comment_ids": [ [1, "v1"], [1, "v2"], [2, "v1"] ]   } } 

i able work around issue using active model serilizer's embed_key option along composite primary key's ids_hash method.

my serializer

class postserializer < activemodel::serializer   attributes :id, :title, :body   has_many :comments, embed :ids, embed_keys: :ids_hash end 

resulting json

{   "post": {     "id": 1,     "title": "new post",     "body": "a body!",     "comment_ids": [       {"comment_id": 1, "version_id": "v1"},       {"comment_id": 1, "version_id": "v2"},       {"comment_id": 2, "version_id": "v1"},     ]   } }