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From: Matthieu Rakotojaona <matthieu.rakotojaona@gmail.com>
Date: Wed, 6 Mar 2013 16:26:08 +0100
Message-ID: 
 <CAMiZLn2jo5EQF+MHncY4AC8=pDzoCGdGMreths4gy+HJRx6tFw@mail.gmail.com>
Subject: Re: view crashes chrome
To: user@couchdb.apache.org
Content-Type: text/plain; charset=UTF-8

On Tue, Mar 5, 2013 at 5:22 PM, Alexander Gabriel <alex@barbalex.ch> wrote:
> Seems like this really is a Chrome issue and has nothing to do with
> CouchDb.

I think downloading the whole documents for each processing is a bad
idea, whatever the browser. You should try to better think your views;
Here are some simple thoughts on how to do it.

Basically, you have a document with multiple fields. I'll take [0] as
an example doc and build upon it.

(I have a question first: Why do you have 3 similar structures (I'm
talking about CSCF(2009), ZH Artengruppen and ZH GIS). When the user
wants a document, do you consider each of those as being different, or
should the 3 be merged and seen as 1 document in the output ?)

The view you will need will look like this:

for each doc:
   for each unitary output doc:  -> if the 3 docs are counted as 3
different ones
      for each field in Felder:
           emit(field, null)

This will give you a huge list of all the fields available for each
document. You will then retrieve it from the client; use a reduce
function (like _count) to group the fields if they are similar.

You now have a list of all possible fields on your client. You can
build the filter panel with this (ie you know what fields you can
filter from), and you can also prefill the export panel.

Now, the user can select the fields he wants to use as a filtering.
Don't send anything to the server yet ! Just build a list of all the
fields you want to keep. In parallel, you can also build the list of
fields you want to export in the appropriate panel.

Next step is to use a _list function to retrieve the documents that
have all the fields (and, if needed, transform to csv also in the
_list function). This _list function would accept a filter_list and an
export_list parameters, the first one being the fields a doc must have
to be exported, and the second one the list of fields to be exported.
You can then convert your documents and send them back to the client.

[0] http://www.barbalex.iriscouch.com/_utils/document.html?artendb/00005A48-816B-4A30-842F-3B1A5DAAAAC3

-- 
Matthieu RAKOTOJAONA