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https://issues.apache.org/jira/browse/COUCHDB-1469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13259679#comment-13259679
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Robert Newson commented on COUCHDB-1469:
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You'll be getting an exception for each doc that doesn't have a doc.Location.
You should add guard clauses;
function(doc, req) {
return doc.Location && doc.Location.Region && doc.Location.Region ===
req.query.region;
}
http://wiki.apache.org/couchdb/Replication#Filtered_Replication
> Filtered replication dies with criteria values not "root"
> ---------------------------------------------------------
>
> Key: COUCHDB-1469
> URL: https://issues.apache.org/jira/browse/COUCHDB-1469
> Project: CouchDB
> Issue Type: Question
> Components: Replication
> Affects Versions: 1.2
> Reporter: Alexandre Paulo
> Priority: Minor
> Labels: replication, replication_crash_with_filter
>
> << Excuse my english... I am portuguese >>
> I have a document structure that goes like this:
> {
> "Location": {
> "City": ...,
> "Region": ...,
> "Country": ...
> }
> }
> I'd like to replicate my documents based on "Region", so, I wrote a filter
> function with
> if (doc.Location.Region && doc.Location.Region == ...) {
> return true;
> } else {
> return false;
> }
> But the replication dies with {"error":"changes_reader_died"}
> I tested my function as a Map function on a view, just replacion "return
> true" with "emit (true)" and "return false" with "emit (false)" and it works
> fine.
> After some testing I came to the conclusion that the replication filter
> function works fine with first-level fields (e.g. "doc.field") but dies with
> multi-level fields (e.g. "doc.parent.field")
> In other words it does not compute "doc.Location.Region" on my filter
> function. I had to change my document structure to have "doc.Region".
> Now my questions:
> - is this a bug or is it intended to work this way?
> - if it is intended why is it allowed on Map functions, but not on filter
> functions?
> Thanks a lot!
> << Excuse my english... I am portuguese >>
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