Thanks Robert. It crossed my mind that I can use List function and expect say include-keys and exclude-keys query parameters thus filter out the undesired documents. 1. Do you think the performance of such function will be reasonable? 2. Can I still support pagination through a List function?
Cheers. On Tue, Oct 16, 2012 at 3:30 PM, Robert Newson-2 [via CouchDB Development] < [email protected]> wrote: > I can't speak about ElasticSearch, but the CouchDB-Lucene query would > certainly reflect the current state of your database (i.e, no "delay") > when you query. > > As for the original question, I don't think you can achieve it > directly with CouchDB views. If you emit each tag of a document as a > key, and null for value (e.g, emit("a",null)), then you could make two > concurrent queries for ?key=a and ?key=b, and read each, row by row, > filtering out as appropriate. It's not trivial. > > B. > > On 16 October 2012 05:50, boazc <[hidden > email]<http://user/SendEmail.jtp?type=node&node=7581300&i=0>> > wrote: > > > Hello, > > > > My documents contain tags which have a corresponding view. > > I want to retrieve all documents that contain a certain tag, but don't > > contain another one. > > (Note that I don't know about the possible tags in advance). > > > > Example: > > id: doc1, tags: [a, b] > > id: doc2, tags: [b, c] > > id: doc3, tags: [a, c] > > If I want all docs with tag=a but not tag=b I expect to get only doc3. > > > > Is there a way to achieve this on CouchDB side? > > Needless to say I cannot do it on the client side as I cannot benefit > from > > pagination and anyway might receive an extreme set of documents I need > to > > work on. > > > > I know I can turn to some search engines e.g. ElasticSearch or > > CouchDB-Lucene, but other than introducing a new component to the system > it > > also means an inherent delay between the "real" data and the indexed > data > > which in my domain is unacceptable. > > > > Thanks!! > > > > > > > > -- > > View this message in context: > http://couchdb-development.1959287.n2.nabble.com/Dynamically-excluding-documents-from-a-view-query-tp7581297.html > > Sent from the CouchDB Development mailing list archive at Nabble.com. > > > ------------------------------ > If you reply to this email, your message will be added to the discussion > below: > > http://couchdb-development.1959287.n2.nabble.com/Dynamically-excluding-documents-from-a-view-query-tp7581297p7581300.html > To unsubscribe from (Dynamically) excluding documents from a view query, > click > here<http://couchdb-development.1959287.n2.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=7581297&code=YmNpdHJpbkBnbWFpbC5jb218NzU4MTI5N3wtMTkyNTAwODYwOA==> > . > NAML<http://couchdb-development.1959287.n2.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> > -- View this message in context: http://couchdb-development.1959287.n2.nabble.com/Dynamically-excluding-documents-from-a-view-query-tp7581297p7581301.html Sent from the CouchDB Development mailing list archive at Nabble.com.
