Yuhao,
Ok, let me think about this. A term can have multiple parents. Each of
those parents would be 'different', yes?
In this case, use a multivalued field for the parent and add all the parent
names or id's to it. The relations should be unique.
Your UI will associate the correct parent id to build the facet query from and
return the correct children because the user
is descending down a specific path in the UI and the parent node unique id's
are returned along the way.
Now, if you are having parent names/id's that themselves can appear in multiple
locations (vs. just terms 'the leafs'),
then perhaps your hierarchy needs refactoring for redundancy?
Happy to help with more details.
Darren
On 01/24/2012 11:22 AM, Yuhao wrote:
Darren,
One challenge for me is that a term can appear in multiple places of the hierarchy. So it's not safe to
simply use the term as it appears to get its children; I probably need to include the entire tree path up
to this term. For example, if the hierarchy is "Cardiovascular Diseases> Arteriosclerosis>
Coronary Artery Disease", and I'm getting the children of the middle term Arteriosclerosi, I need to
filter on something like "parent:Cardiovascular Diseases/Arteriosclerosis".
I'm having trouble figuring out how I can get the complete path per above to add to the URL of each facet term. I
know "velocity/facet_field.vm" is where I build the URL. I know how to simply add a
"parent:<term>" filter to the URL. But I don't know how to access a document field, like the
complete parent path, in "facet_field.vm". Any help would be great.
Yuhao
________________________________
From: "dar...@ontrenet.com"<dar...@ontrenet.com>
To: Yuhao<nfsvi...@yahoo.com>
Cc: solr-user@lucene.apache.org
Sent: Monday, January 23, 2012 7:16 PM
Subject: Re: Hierarchical faceting in UI
On Mon, 23 Jan 2012 14:33:00 -0800 (PST), Yuhao<nfsvi...@yahoo.com>
wrote:
Programmatically, something like this might work: for each facet field,
add another hidden field that identifies its parent. Then, program
additional logic in the UI to show only the facet terms at the currently
selected level. For example, if one filters on "cat:electronics", the
new
UI logic would apply the additional filter "cat_parent:electronics".
Can
this be done?
Yes. This is how I do it.
Would it be a lot of work?
No. Its not a lot of work, simply represent your hierarchy as parent/child
relations in the document fields and in your UI drill down by issuing new
faceted searches. Use the current facet (tree level) as the parent:<level>
in the next query. Its much easier than other suggestions for this.
Is there a better way?
Not in my opinion, there isn't. This is the simplest to implement and
understand.
By the way, Flamenco (another faceted browser) has built-in support for
hierarchies, and it has worked well for my data in this aspect (but less
well than Solr in others). I'm looking for the same kind of
hierarchical
UI feature in Solr.
