Hi, Martin:
I suspect the error is being thrown from your code from the
document.content.name path.
When you snippet, the first document is the search report, which does not have
a content key.
Only the actual document descriptors have the content key. (As noted
previously, you can suppress the actual documents if you only want the report
by specifying the categories:'none' option.)
By the way the best practice with Promises is to supply a catch callback, as in:
db.documents.query(...)
.then(function(successResponse){...})
.catch(function(failureError){...});
An error in your success callback will not call an error callback in the same
.then() clause but will call a subsequent error callback. That's why it's a
good idea to use the catch callback.
The only reason to use an error callback in a .then() clause is to provide
special handling for an error upstream of a catch callback.
The try/catch statement will only catch errors in the code that sets up the
promises and not errors when the callbacks are executed asynchronously. (In
addition, try/catch statements appear to cause the v8 JavaScript engine to
deoptimize the function at present.)
It's easy to confuse the try/catch statement with the catch callback, but
that's part of the Promises standard.
Hoping that helps,
Erik Hennum
________________________________
From: [email protected]
[[email protected]] on behalf of Martin Vollmix
[[email protected]]
Sent: Sunday, June 07, 2015 11:23 AM
To: 'MarkLogic Developer Discussion'
Subject: Re: [MarkLogic Dev General] snippet do not work in querybuilder node.js
For better documentation I send you my complete POST Request Handler
router.post('/search', function (req, res) {
try {
db.documents.query(
qb.where(
qb.parsedFrom(req.body.SearchString)
).slice(qb.snippet())
//.withOptions({categories: ['content', 'metadata']})
//.withOptions({categories: ['content']})
)
.result(function (documents) {
documents.forEach(function (document) {
console.log(document.content.name + " at " + document.uri);
})
res.render('index', { title: 'MVSearch', results : documents });
res.end();
}, function (error) {
console.dir(error);
res.render('index', { title: 'MVSearch', error : error });
res.end();
});
}
catch (e) {
res.render('index', { title: 'MVSearch', session : req.session, exp : e
});
console.log(e);
}
});
As soon as I use the slice I got the already mentioned error
Best Regards
Martin
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Martin Vollmix
Gesendet: Sonntag, 7. Juni 2015 17:24
An: 'MarkLogic Developer Discussion'
Betreff: [MarkLogic Dev General] snippet do not work in querybuilder node.js
Hi,
the next problem I have is that snippet does not work in my node.js app
my query looks like this:
db.documents.query(
qb.where(qb.parsedFrom(req.body.SearchString))
.slice(qb.snippet())
//.withOptions({categories: ['content', 'metadata']})
//.withOptions({categories: ['content']})
)
The error I get is this one:
E:\Git\ExpressTest\node_modules\marklogic\node_modules\bluebird\js\main\async.js
:43
fn = function () { throw arg; };
^
TypeError: Cannot read property 'name' of undefined
at E:\Git\ExpressTest\routes\index.js:40:41
at Array.forEach (native)
at E:\Git\ExpressTest\routes\index.js:39:19
at tryCatcher (E:\Git\ExpressTest\node_modules\marklogic\node_modules\bluebi
rd\js\main\util.js:24:31)
at Promise.module.exports.Promise._settlePromiseFromHandler (E:\Git\ExpressT
est\node_modules\marklogic\node_modules\bluebird\js\main\promise.js:454:31)
at Promise.module.exports.Promise._settlePromiseAt (E:\Git\ExpressTest\node_
modules\marklogic\node_modules\bluebird\js\main\promise.js:530:18)
at Promise.module.exports.Promise._settlePromises (E:\Git\ExpressTest\node_m
odules\marklogic\node_modules\bluebird\js\main\promise.js:646:14)
at Async._drainQueue (E:\Git\ExpressTest\node_modules\marklogic\node_modules
\bluebird\js\main\async.js:177:16)
at Async._drainQueues (E:\Git\ExpressTest\node_modules\marklogic\node_module
s\bluebird\js\main\async.js:187:10)
at Immediate.drainQueues [as _onImmediate] (E:\Git\ExpressTest\node_modules\
marklogic\node_modules\bluebird\js\main\async.js:15:14)
at processImmediate [as _immediateCallback] (timers.js:358:17)
What am I doing wrong?
Any hints
Best Regards
Martin
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