couchdb - How to link more documents in one view -


there 3 couchdb document types:

user

{ "_id: "user/author1", "type: "user", "name" : "joe doe"}

review

{ "_id: "review/review1", "type" : "review", "content" : "..." }

product

{ "_id": "product/awesomeproduct", "type" : "product", "reviews": [    {        "author": "author1",        "review_id": "review/review1"    },    {        "author": "author2",        "review_id": "review/review2"    }   ] }

how can data documents single view?

i try use linked documents, can use (with include_docs=true) 1 per emit:

(coffescript)

(doc) ->   if doc.type "product"     review in doc.reviews        emit [doc._id, review.author],{_id: "user/" + review.author}        emit [doc._id, review.author],{_id: review.review_id}

but want (get user , review doc in single emit):

 (doc) ->   if doc.type "product"     review in doc.reviews        key = [doc._id, review.author]        value = {"user:" {_id: "user/" + review.author},"review" :{_id: review.review_id}}        emit key, value

is there possible way how achieve it? how join these types of documents in single view?

i want result:

[   key : ["product/awesomeproduct", "author1"],    value : {user: {_id: "user/author1"},review :{_id: "review/review1"}}   doc:       {user: {"_id: "user/author1", "type: "user", "name" : "joe doe"},       review: {"_id: "review/review1", "type" : "review", "content" : "..."}      }  ]

short anwser...you can't. couchdb allows emit single document @ time.

there 2 approaches getting data need.

  1. keep structure as-is , perform join manually in client code.
  2. denormalize data. denormalizing here placing reviews inside product document.

data modeling considerations mongodb concepts how structure data in nosql environment same couchdb


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