Multiple Indexes in same Solr Core..? - solr

Question

I am using Apache Solr..I have the following Scenario.. :
I have Two table in my PostGreSQL database. One is "Cars". Other is "Dealers"
Now i have a data-config file for Cars like the following :
<document name="offerings">
<entity name="jc_offerings" query="select * from jc_offerings" >
<field column="id" name="id" />
<field column="name" name="name" />
<field column="display_name" name="display_name" />
<field column="extra" name="extra" />
</entity>
</document>
I have a similar data--config.xml for "Dealers". It has the same fields as Cars : name, extra etc
Now in my Schema.xml , i have defined the following fields :
<fields>
<field name="id" type="string" indexed="true" />
<field name="name" type="name" indexed="true" />
<field name="extra" type="extra" indexed="true" />
<field name="CarsText" type="text_general" indexed="true"
stored="true" multiValued="true"/>
</fields>
<uniqueKey>id</uniqueKey>
<defaultSearchField>CarsText</defaultSearchField>
<copyField source="name" dest="CarsText"/>
<copyField source="extra" dest="CarsText"/>
Now i want to search like : "where name is Maruti"..So how will Solr know Whether to Search ::: Cars Field : name OR Dealer Field "name"..??
I have read to the following link : http://wiki.apache.org/solr/MultipleIndexes
But i am not able to understand how is works..??
After reading that link : I made another field in My Cars and Dealers *data-config.xml* .. Something like :
<field name="type" value="car" /> : in Cars date-config.xml
and
<field name="type" value="dealer" /> : in Cars date-config.xml
And then in Schema.xml i created a new field :
<field name="type" type="string" indexed="true" stored="true" />
And then i queried something like :
localhost:8983/solr/select?q=name:Maruti&fq=type:dealer
But it dint Worked..!!
So what should i do..??

Answer 1

if the fields are the same for both cars and dealers, you could use one index with an object defined like so:
<fields>
<field name="id" type="string" indexed="true" stored="true"/>
<field name="name" type="name" indexed="true" stored="true" />
<field name="extra" type="extra" indexed="true" stored="true" />
<field name="description_text" type="text_general" indexed="true" stored="true" multiValued="true"/>
<field name="type" type="string" indexed="true" stored="true" />
</fields>
this will work for both cars and dealers (so you don't need to have 2 indexes) and you'll use the "type" field to sort out if you want a "dealer" or a "car" (i'm using the same system to filter out similar types of objects with only a minor "semanthical" difference)
also you'll need to add stored="true" to the fields you want to retrieve, or you'll be only able to use them for searching (hence that index="true")

Answer 2

Adding a default value to the type field will ensure the type value being set to cars|dealer.
You will have to index the sources separately. Then use copy field and you can easily filter on either cars|dealer.
This does seem a bit tricky and is not explained well in the muti-indexes link referred to above.