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Date: Mon, 20 Sep 2010 09:52:20 -0600
Message-ID: <AANLkTi==ynkCEVRJ2NGFekC-P1hwo1_VYhaLY1daM8uw@mail.gmail.com>
Subject: Re: Muti-View support : feedback,issues, and question
From: Norman Barker <norman.barker@gmail.com>
To: cdr53x@free.fr
Cc: user@couchdb.apache.org, dev@couchdb.apache.org
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Hi,

thanks for testing this out, this looks like a configuration issue,
_multi should be a registered httpd_db_handler in local.ini as
follows.

[httpd_db_handlers]
_multi =3D {multiview_httpd, handle_request}

I will look into this and make sure it gets added.

In the test scripts the following code

    var ddocThree =3D {
      _id:"_design/three",
      views: {
        "test" : {map: "function (doc) {if (doc.integer % 3 =3D=3D 0)
emit(doc.integer, null)};"}
      }
    };

is emitting keys with the doc._id as an integer, in this case for
multiples of 3, the second view ddocFour is emitting the documents
with keys that are multiples of 4.

Hence when we do a multiview and find the intersections of these two
views we get the documents whose id (as integer keys) are multiples of
12.

Norman

On Mon, Sep 20, 2010 at 5:27 AM,  <cdr53x@free.fr> wrote:
>
>
>
> Hi,
>
> We successfully installed the multiview couchdb from the git, and there s=
eems to be some issues with the tests demonstrating the mutiview features.
>
> 1/ Issue #1 : muti view demonstration test is not available from Futon
>
> We can see it is included in the tests ( file share/couchdb/www/script/co=
uch_tests.js ), but not shown in Futon.
>
> This can be fixed by copying the multiview.js file in the share/couchdb/w=
ww/script/tests directory on install time.
>
> Adding the file in the share/Makefile.am should fix the build process.
>
>
> 2/ Issue #2 : the test fails
>
> When we finally add it the test fails with the following errors :
>
> 1.Assertion failed : results.row
> 2.Assertion failed : results.row
>
> The log is pretty verbose (with debug level), but basicaly there seems to=
 be a 400 error when views URL is queried.
>
> Here is an extract of the log, full log is attached (and gzipped) :
>
> [Mon, 20 Sep 2010 11:01:46 GMT] [debug] [<0.155.0>] httpd 400 error respo=
nse:
> =A0{"error":"bad_request","reason":"Only reserved document ids may start =
with underscore."}
>
> [Mon, 20 Sep 2010 11:01:46 GMT] [debug] [<0.599.0>] 'POST' /test_suite_db=
/_multi {1,1}
> Headers: [{'Accept',"application/json"},
> =A0 =A0 =A0 =A0 =A0{'Accept-Charset',"ISO-8859-1,utf-8;q=3D0.7,*;q=3D0.7"=
},
> =A0 =A0 =A0 =A0 =A0{'Accept-Encoding',"gzip,deflate"},
> =A0 =A0 =A0 =A0 =A0{'Accept-Language',"en-us,en;q=3D0.5"},
> =A0 =A0 =A0 =A0 =A0{'Cache-Control',"no-cache"},
> =A0 =A0 =A0 =A0 =A0{'Connection',"keep-alive"},
> =A0 =A0 =A0 =A0 =A0{'Content-Length',"52"},
> =A0 =A0 =A0 =A0 =A0{'Content-Type',"application/json; charset=3DUTF-8"},
> =A0 =A0 =A0 =A0 =A0{'Host',"127.0.0.1:5985"},
> =A0 =A0 =A0 =A0 =A0{'Keep-Alive',"115"},
> =A0 =A0 =A0 =A0 =A0{'Pragma',"no-cache"},
> =A0 =A0 =A0 =A0 =A0{'Referer',"http://127.0.0.1:5985/_utils/couch_tests.h=
tml?script/couch_tests.js"},
> =A0 =A0 =A0 =A0 =A0{'User-Agent',"Mozilla/5.0 (X11; U; Linux x86_64; en-U=
S; rv:1.9.2.10) Gecko/20100915 Ubuntu/10.04 (lucid) Firefox/3.6.10"}]
> [Mon, 20 Sep 2010 11:01:46 GMT] [debug] [<0.599.0>] OAuth Params: []
> [Mon, 20 Sep 2010 11:01:46 GMT] [debug] [<0.599.0>] Minor error in HTTP r=
equest: {bad_request,
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 <<"Only r=
eserved document ids may start with underscore.">>}
> [Mon, 20 Sep 2010 11:01:46 GMT] [debug] [<0.599.0>] Stacktrace: [{couch_d=
oc,validate_docid,1},
> =A0 =A0 =A0 =A0 =A0 =A0 {couch_httpd_db,db_doc_req,3},
> =A0 =A0 =A0 =A0 =A0 =A0 {couch_httpd_db,do_db_req,2},
> =A0 =A0 =A0 =A0 =A0 =A0 {couch_httpd,handle_request_int,5},
> =A0 =A0 =A0 =A0 =A0 =A0 {mochiweb_http,headers,5},
> =A0 =A0 =A0 =A0 =A0 =A0 {proc_lib,init_p_do_apply,3}]
>
>
> 3/ The demo test script is not clear
>
> Our understanding is that this feature returns =A0an intersection (on doc=
id) from several view queries. At least this is what we read on the mailing=
 list.
>
> However, it is not cleat at all how keys are sent to the distinct views. =
Especially, how can we use the multi view and send different keys for the d=
ifferent views.
>
> Let's say that :
>
> we have a view using =A0doc creation date as a key
> another view using doc author as =A0key
>
> We would like to get all the documents created by a particular author for=
 a given time range, how do we provide the appropriate key.
>
> A clear example would really be appreciated because currently, there are =
no keys provided in =A0the js example code.
>
> ( BTW we know that this particular example can be resolved using collatio=
n, however it seemed the simplest example we can find for the multi view cr=
iteria selection ).
>
> Regards,
>
> cdrx
>
>