incubator-couchdb-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From James Klo <jim....@sri.com>
Subject Re: Question about multiple keys with ranges
Date Mon, 13 Feb 2012 21:00:00 GMT
The problem is how: 
	"2012-02-11T22:00:00"

collates within:

	"2012-02-13T16:18:19.565+0000"

remember it's basically alphanumerical... so technically, it's following collation rules.

so you really need to using a startkey like:

	"2012-02-11T22:00:00.000+0000"

for it to work.

Jim Klo
Senior Software Engineer
Center for Software Engineering
SRI International

On Feb 13, 2012, at 11:11 AM, Mathieu Castonguay wrote:

> I tried that exact example with
> ?startKey=["26de9c438e5d1c0f075f2ae6ad0bcc82","2012-02-11T22:00:00"]&endkey=["26de9c438e5d1c0f075f2ae6ad0bcc82",{}]
> and I still get records in the past:
> 
> {"total_rows":3,"offset":0,"rows":[
> {"id":"344e921af796598bcd709ba973003c60","key":["26de9c438e5d1c0f075f2ae6ad0b39b2","2012-02-13T16:18:19.565+0000"],"value":"344e921af796598bcd709ba973003c60"},
> {"id":"344e921af796598bcd709ba973001d3f","key":["26de9c438e5d1c0f075f2ae6ad0bcc82","2012-02-10T21:44:14.920+0000"],"value":"344e921af796598bcd709ba973001d3f"},
> {"id":"344e921af796598bcd709ba973002c01","key":["26de9c438e5d1c0f075f2ae6ad0bcc82","2012-02-10T22:05:48.218+0000"],"value":"344e921af796598bcd709ba973002c01"}
> ]}
> 
> 
> The view's map function is:
> 
> function(doc) { if(doc.userId && doc.timeScheduled)
> {emit([doc.userId,doc.timeScheduled], doc._id)} }
> 
> 
> 
> 
> On Mon, Feb 13, 2012 at 1:55 PM, James Klo <jim.klo@sri.com> wrote:
> 
>> Not sure how you are querying, but are you doing the equivalent to this?
>> startkey and endkey should be expressed as JSON
>> 
>> curl -g '
>> http://localhost:5984/orders/_design/Order/_view/by_users_after_time?startkey=[
>> "f98ba9a518650a6c15c566fc6f00c157","2012-01-01T11:40:52.280Z"]&endkey=["userid",{}]'
>> 
>> 
>> *
>> Jim Klo
>> Senior Software Engineer
>> Center for Software Engineering
>> SRI International
>> e. jim.klo@sri.com
>> p. 805.542.9330 x121
>> m.  805.286.1350
>> f. 805.546.2444
>> *
>> 
>> On Feb 13, 2012, at 10:27 AM, Mathieu Castonguay wrote:
>> 
>> I tried reversing the keys with no luck. I still get timestamps that are in
>> the past (before the startKey).
>> 
>> On Sat, Feb 11, 2012 at 6:37 PM, James Klo <jim.klo@sri.com> wrote:
>> 
>> Reverse the key. [userid, time]
>> 
>> 
>> CouchDB is all about understanding collation. Basically views are
>> 
>> sorted/grouped from left to right alphanumeric. See
>> 
>> http://wiki.apache.org/couchdb/View_collation for the finer details as
>> 
>> there are more rules than the basics I mention.
>> 
>> 
>> so the reversal sorts the view by userid first, then date as string.
>> 
>> Instead of sorting by dates then userids.
>> 
>> 
>> You do it this way because you know the exact userid, but not the exact
>> 
>> date. If you knew the exact date, but not the userid, what you have
>> 
>> currently would be better.
>> 
>> 
>> - Jim
>> 
>> 
>> 
>> Sent from my iPad
>> 
>> 
>> On Feb 11, 2012, at 1:54 PM, "Mathieu Castonguay" <
>> 
>> mcastonguay@justlexit.com> wrote:
>> 
>> 
>> I have a simple document named Order structure with the fields id, name,
>> 
>> userId and timeScheduled.
>> 
>> 
>> What I would like to do is create a view where I can find the
>> 
>> document.idfor those who's userId is some value and timeScheduledis
>> 
>> after a given date.
>> 
>> 
>> My view:
>> 
>> 
>> "by_users_after_time": {
>> 
>>     "map": "function(doc) { if (doc.userId && doc.timeScheduled) {
>> 
>> emit([doc.timeScheduled, doc.userId], doc._id); }}"
>> 
>> }
>> 
>> 
>> If I do
>> 
>> 
>> 
>> localhost:5984/orders/_design/Order/_view/by_users_after_time?startKey="[2012-01-01T11:40:52.280Z,f98ba9a518650a6c15c566fc6f00c157]"
>> 
>> I get every result back. Is there a way to access key[1] to do an if
>> 
>> doc.userId == key[1] or something along those lines and simply emit on
>> 
>> the
>> 
>> time?
>> 
>> 
>> This would be the SQL equivalent of select id from Order where userId =
>> 
>> "f98ba9a518650a6c15c566fc6f00c157" and timeScheduled >
>> 
>> 2012-01-01T11:40:52.280Z;
>> 
>> 
>> I did quite a few Google searches but I can't seem to find a good
>> 
>> tutorial
>> 
>> on working with multiple keys. It's also possible that my approach is
>> 
>> entirely flawed so any guidance would be appreciated.
>> 
>> 
>> Thank you,
>> 
>> 
>> Matt
>> 
>> 
>> 
>> 


Mime
View raw message