Hierarchy component

10 Oct '14, 03:57 PM
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Forum Forum Starter - Level 2

In my WebRatio 7.2.0 project I'm using a hierarchical list, but it dosn't display what I expect.

I defined the entity Titolario in domain model with a 1-N relationship to itself. In the database table, I've inserted some records with NULL in titolario_oid column if they are parents and the parent's oid if they are children. In a site view I put a Hierarchy Component with these parameters: Entity, Display Attributes, Sort Attributes, Level Order. I put also a level under the hierarchy, with the same entity and attributes and Rel. Role equal to ChildToParent relationship.

What I get is a list where I see parent records one time (correct) but children records twice.

What am I doing wrong?

Thanks.

Luciano Sulis
 

 
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Forum Starter - Level 3

Hi Luciano,


the Hierarchy Component is thought to display a nested list of elements coming from different entities connected by relationships.
The behaviour you described is correct, because in your case, the Hierarchy Component displays all the records in Titolario and then, it display a child element for those having one. 
In this way children elements are displayed twice: once because they belong to the entity Titolario, and twice because they belong to the Level you defined on the Hierarchy.

If you want to obtain a proper result, you should use the Recursive Hierarchy Component, that allows to display a nested list of elements coming from the same entity and connected by a recursive relationship.

 

You can fine more details in the following online lesson:

http://www.webratio.com/learn/learningobject/advanced-master-detail

 
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Forum Starter - Level 2

Thanks Antonella. I didn't understand the hierarchy behavior. I tried to use recursive hierarchy, but I got no record. If I mark "Show all as root" I got all the records, but in a flat format of course. I put in Child to Parent Role my ChildToParent relationship. I didn't put any conditional expression.

Luciano

 
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Forum Starter - Level 3

Using the "Show all as root" property you should obtain the same result as using the Hierarchy Component. So, you should uncheck that property.

When you set the "Entity" property for the Recursive Component, WebRatio Platform automatically set the "Child To Parent Role" property (if there is a unique recursive relationship on your entity). So I think that property is properly set.

According to what you wrote, I think that you should check if the "Display Attribute" property is empty, or if something is changed in your data.

 
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