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Tutorial: Using StreamMerge and ItemFilterDuplicates in 2sxc 9.10

Two new data-sources help with manipulating lists like never before - let's discover:

  1. StreamMerge
  2. ItemFilterDuplicates

The StreamMerge DataSource

This data-source will take multiple streams of data, and combine them into one single stream - like this:

Common use cases are

  • combining results of different conditions
  • combining streams based on relationships 

This is something you need a lot - here some real-life examples:

  1. A query should retrieve news-items like this:
    1. of the last 10 days...
    2. but on top of that we also want to show "pinned" news, even if they are older. ...so one filter is date-based, the other category based. 
  2. You want to show images:
    1. all which contain any of the words "ocean,sea,wate" in the title
    2. ...and all which are tagged "island"
  3. You want to show employees...
    1. all of a certain team
    2. ...and the management above them (which may not be marked as part of the team)

The ItemFilterDuplicates DataSource

This datasource will find duplicate items, and remove them - and optionally give you all the duplicates in another list, in case you need them for further processing. 

The example above shows the results of two filters which were merged - resulting in one item "2sic" included twice. The ItemFilterDuplicates will remove all duplicates on the Default stream, and also offer a stream Duplicates containing all the items which were duplicate. Note that if an item exists 7 times, it will still only be provided once in the Duplicates stream. 

Enhancement to String-Dropdown

There are many cases today where a drop-down is the preferred input-type, but because advanced scenarios require a custom input (like if you want to use a url-parameter to provide the value, requiring you to input [QueryString:SortOrder] instead of asc, it needed an open text field. To better cater to these scenarios, we added a new parameter:

If you set the Enable Free Text to true, the normal dropdown receives a new button on the right side - like this:

If you press that I-bar button, the dropdown will switch into a normal text-box, allowing you to enter a custom value:

Keep Coding

Exiting new features are coming up, hope you love it!

Daniel


Daniel Mettler grew up in the jungles of Indonesia and is founder and CEO of 2sic internet solutions in Switzerland and Liechtenstein, an 20-head web specialist with over 800 DNN projects since 1999. He is also chief architect of 2sxc (see github), an open source module for creating attractive content and DNN Apps.



Read more posts by Daniel Mettler

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