Using both limit and sort functions simultaneously in YUI3 with YQL

Currently, I have a YQL query that successfully combines multiple RSS feeds and then sorts them by date. While this is effective, I am interested in implementing pagination to manage the results more efficiently.

Below is the existing query I'm working with:

select channel.item.title, channel.item.link, channel.item.pubDate, channel.item.description(0) from xml where url in(... urls go here ...) | unique(field='channel.item.link') | sort(field='channel.item.pubDate', descending='true')

The issue at hand is that YQL executes LIMIT and OFFSET before the sorting filter. Therefore, if I set a LIMIT of 5, I only retrieve the first 5 items from the initial RSS feed rather than the first 5 items across all combined feeds.

I am curious if there is a way to chain queries together so that I can first sort all my results and then apply a query to limit the number of results returned.

Any assistance on this matter would be greatly appreciated.

javascriptjsonyuiyqlyui3

Answer №1

To retrieve the initial 5 items from the refined feed, utilize the truncate(count=5) function.

select channel.item.title, channel.item.link, channel.item.pubDate, channel.item.description(0) from xml where url in(... urls go here ...) | unique(field='channel.item.link') | sort(field='channel.item.pubDate', descending='true') | truncate(count=5)

Alternatively, you can employ the tail() method with a reverse sort as outlined above.

For more information, visit http://developer.yahoo.com/yql/guide/sorting.html

Answer №2

Have you considered utilizing tail() combined with sort() but in reverse order?

Perhaps something along these lines:

select channel.item.title, channel.item.link, channel.item.pubDate, channel.item.description(0) from xml where url in(... urls go here ...) | unique(field='channel.item.link') | sort(field='channel.item.pubDate', descending='false') | tail(count=5)

I haven’t tested this method myself, and I’m uncertain about the specific sort order required, but definitely give tail() a try. It seems there isn't an equivalent head() function, so ensure that the latest items appear at the end after sorting.

For more details, please visit http://developer.yahoo.com/yql/guide/sorting.html

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