Hi Rashmi,
Here is some more details on how to use PathHierarchyTokenizer that Oleg
provided the link to.
If this is your document:
> *Sample document*
> <doc>
> name=Pbook1
> category=NonFic/Sci/Phy/Quantum
> author=ABC
> price=20.00
> <doc>
Then, in your schema.xml:
<field name="category" type="tree" indexed="true" stored="true"
multiValued="true"/>
<fieldType name="tree" class="solr.TextField">
<analyzer type="index">
<tokenizer class="solr.PathHierarchyTokenizerFactory" delimiter="/" />
</analyzer>
<analyzer type="query">
<tokenizer class="solr.KeywordTokenizerFactory" />
</analyzer>
</fieldType>
Then, in your Solr query, you can simply add:
&facet=true
&facet.field=category
You should see a facet that contains each level of the taxonomy with counts.
To navigate the taxonomy you add filter queries using the part of the path
you want narrow the results down to (values from the category facet).
So, for example a user clicks on "NonFic"
&facet=true
&facet.field=category
&fq={!term f=category}NonFic
Then "NonFic/Sci"
&fq={!term f=category}NonFic/Sci
Then "NonFic/Sci/Phy"
&fq={!term f=category}NonFic/Sci/Phy
etc..
If you only want to display the leaf level category and indent child
categories you can easily do this in your UI by splitting the facet value
on your separator, "/" in this case.
Thanks,
Evan
On Nov 14, 2014 8:06 PM, "Oleg Savrasov" <osavra...@griddynamics.com> wrote:
> Hi Rashmi,
>
> I believe you are looking for PathHierarchyTokenizer,
> see
>
> https://lucene.apache.org/core/4_0_0/analyzers-common/org/apache/lucene/analysis/path/PathHierarchyTokenizer.html
>
> Oleg
>
> 2014-11-14 17:53 GMT-05:00 rashmy1 <rashmy.appanerava...@siemens.com>:
>
> > Hello,
> > I'm trying to setup Solr for fetching hierarchical facets.
> > Please advice which of the below approaches should be followed for my
> > scenario.
> > *Scenario:
> > *
> > NonFic
> > Hist
> > HistBook1
> > HistBook2
> > Sci
> > Phy
> > Quantum
> > Pbook1
> > Pbook2
> > Thermodynamics
> > Pbook3
> > Pbook4
> > Chem
> > Cbook1
> > Math
> > Mbook1
> > Fic
> > Mystery
> > Mybook1
> > Childrens
> > Chbook1
> > Chbook2
> >
> > *Sample document*
> > <doc>
> > name=Pbook1
> > category=NonFic/Sci/Phy/Quantum
> > author=ABC
> > price=20.00
> > <doc>
> >
> > *Requirements:*
> > -Show drill down facets
> > -If user searched for "*", the initial set of facets to be shown are
> > 'NonFic' and 'Fic'
> > -If user selects facet 'NonFic', we then show the facets 'Hist' and 'Sci'
> > only.
> >
> > *Option1:*
> > /Solr schema:/
> > <field indexed="true" multiValued="true" name="category" required="true"
> > stored="true" type="string"/>
> > /Document supplied for indexing:/
> > <doc>
> > name=Pbook1
> > category=0/NonFic
> > category=1/NonFic/Sci
> > category=2/NonFic/Sci/Phy
> > category=3/NonFic/Sci/Phy/Quantum
> > category=0/Other (a book can belong to multiple categories)
> > author=ABC
> > price=20.00
> > <doc>
> > With Option2, we can do a drill down facet query.
> > For example, if we give facet.prefix=NonFic/Sci/, the facet results are:
> > NonFic/Sci/Phy
> > NonFic/Sci/Chem
> > NonFic/Sci/Math
> > The only issue is that I have to take care of generating all possible
> path
> > information for 'category'
> >
> > *Option2:*
> > /Solr schema:/
> > <fieldType class="solr.TextField" name="path">
> > <analyzer type="index">
> > <tokenizer class="solr.PathHierarchyTokenizerFactory"
> > delimiter="/"/>
> > </analyzer>
> > </fieldType>
> > <field indexed="true" multiValued="true" name="category" required="true"
> > stored="true" type="path"/>
> > /Document supplied for indexing:/
> > <doc>
> > name=Pbook1
> > category=NonFic/Sci/Phy/Quantum
> > author=ABC
> > price=20.00
> > <doc>
> > With Option2, we can do facet query but it returns all possible
> combination
> > of paths.
> > For example, if we give facet.prefix=Fic, the facet results are:
> > Fic (3)
> > Fic/Mystery (1)
> > Fic/Childrens (2)
> >
> >
> > I'm looking to supply a doc with just a single entry (like
> > 'category=NonFic/Sci/Phy/Quantum' ) and be able to do a drill down query.
> > Is
> > there some existing Solr tokernizer which takes care of generating all
> > possibly combinations which indexing instead of having to generating them
> > as
> > part of <doc> creation?
> >
> > Thanks
> >
> >
> >
> >
> >
> > --
> > View this message in context:
> > http://lucene.472066.n3.nabble.com/Hierarchical-faceting-tp4169263.html
> > Sent from the Solr - User mailing list archive at Nabble.com.
> >
>
