James Dingwall wrote:
Hi,
I am experiencing some problems with update functions which I use to
create documents in CouchDB when they are using require() to load a
common library. It seems that after publishing the design document
then the first update function to be called works well but any
subsequent ones do not call require(). With the log() call in the
require I see this appear in the call to the first update but it does
not appear with any others, they print a stack trace such as:
[Thu, 12 Dec 2013 13:20:55 GMT] [error] [<0.6458.0>] httpd 500 error
response:
{"error":"render_error","reason":"function raised error: (new
ReferenceError(\"docUtil is not defined\", \"updates.template\", 54))
stacktrace: (null,[object Object])@updates.template:54
runUpdate(<<<body of update function>>>),[object Object],[object
Array])@/usr/local/share/couchdb/server/main.js:1033
(\"_design/provision\",[object Array],[object
Array])@/usr/local/share/couchdb/server/main.js:1517
()@/usr/local/share/couchdb/server/main.js:1562
@/usr/local/share/couchdb/server/main.js:1573
"}
As far as I can tell by require()d code is ok since the same structure
is working for other things. What it seems to me is that it is loaded
by CouchDB for the first update function and is then recorded as
loaded but a second update function needing the same code has its
require ignored but cannot reference the in memory copy produce by the
require from the first update.
I have tested versions CouchDB 1.3.1, 1.4.0 and 1.5.0 all with the
same behaviour. I am running on Ubuntu precise with esl-erlang
1:16.b.3-1.
Any suggestions on where to look next?
Thanks,
James
As an example:
The updates are all of the form:
function(doc, req) {
require('views/lib/docUtil');
if(!doc) {
doc = {some: defaults}
}
// some other code
doc.meta = docUtil.metaCreate(req);
return([doc, JSON.stringify(doc, undefined, 2)]);
}
views/lin/docUtil is similar too:
(function(global) {
var _metaCreate = function(req) {
...
};
var _metaModify = function(req) {
...
};
log('docUtil loaded')
global.docUtil = {
metaCreate = _metaCreate,
metaModify = metaModify
};
})(exports.docUtil = this)
Here is a complete test case design document which demonstrates the problem.
{
"_id": "_design/ptest",
"updates": {
"two": "function(doc, req)
{\n\trequire('views/lib/docUtil');\n\n\tif(!doc) {\n\t\tdoc =
{};\n\t}\n\n\tdoc._id = 'two';\n\n\tdoc.meta =
docUtil.metaCreate();\n\n\treturn([doc, JSON.stringify(doc, undefined,
2)]);\n}",
"one": "function(doc, req)
{\n\trequire('views/lib/docUtil');\n\n\tif(!doc) {\n\t\tdoc =
{};\n\t}\n\n\tdoc._id = 'one';\n\n\tdoc.meta =
docUtil.metaCreate();\n\n\treturn([doc, JSON.stringify(doc, undefined,
2)]);\n}"
},
"language": "javascript",
"views": {
"lib": {
"docUtil": "(function(global) {\n\nvar _metaCreate =
function() {\n\treturn({\n\t\ta: 'create',\n\t\tb:
'bbbb'\n\t});\n};\n\nvar _metaModify = function() {\n\treturn({\n\t\ta:
'modify',\n\t\tb: 'bbbb'\n\t});\n};\n\nglobal.docUtil = {\n\tmetaCreate:
_metaCreate,\n\tmetaModify: _metaModify\n};\n\nlog('require
docUtil');\n\n})(exports.docUtil = this)"
}
},
"type": "design/ptest"
}
Call the update functions like:
curl -X POST http://couchdb:5984/zydev/_design/ptest/_update/one -
creates a document
curl -X POST http://couchdb:5984/zydev/_design/ptest/_update/two - fails
