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From "Roger Binns (JIRA)" <>
Subject [jira] Commented: (COUCHDB-582) _changes filter missing updates
Date Sun, 29 Nov 2009 03:54:20 GMT


Roger Binns commented on COUCHDB-582:

Not quite as good as tests, but here is an exact description of what they should do.

Create a filter function:

function(doc, req) {
  // log("filter "+toJSON(doc));  -- useful for debugging and confirming filter was even called
 return doc.type=="A" || doc._deleted;

Now watch _changes with that filter function.  You should verify that there is always at least
one row returned.  Create several docs in a row with doc.type="A".  Delete them.  There should
always be at least one row returned.  (Bonus points for matching up returned rows with creation/deletion

A related issue is that _changes requests return based on if there was data before filtering.
 Consequently running the above will return no rows if you create doc.type="B".  It would
be more efficient to only return if there are rows *after* filtering in which the above test
can continue to run and should not return if you create doc.type="B".

> _changes filter missing updates
> -------------------------------
>                 Key: COUCHDB-582
>                 URL:
>             Project: CouchDB
>          Issue Type: Bug
>          Components: JavaScript View Server
>            Reporter: Chris Anderson
>            Assignee: Chris Anderson
>             Fix For: 0.11
> reported on the user mailing list: 
> I know there is work to be done on the filter mechanism (specifically around process
reuse and concurrency)
> The current implementation requires a process per connected user. This should be not
that hard to patch.

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