How to write nested schema.xml in solr?

Question

How to write nested schema.xml in solr

The document in schema.xml says

<!-- points to the root document of a block of nested documents. Required for nested
document support, may be removed otherwise
-->
<field name="_root_" type="string" indexed="true" stored="false"/>

http://svn.apache.org/viewvc/lucene/dev/trunk/solr/example/solr/collection1/conf/schema.xml?view=markup

Which can be used in

https://cwiki.apache.org/confluence/display/solr/Other+Parsers#OtherParsers-BlockJoinQueryParsers

What will be schema.xml for nesting the following items:

• Person string
• Address
  • city string
  • postcode string

Histopathology

Were you able to find a solution to this ? – Ocam

Answer 1

I know this is an old question, but I ran into a similar issue. Modifying my solution for yours, the fields you need to add to your schema.xml are as follows:

 <field name="person" type="string" indexed="true" stored="true" />
 <field name="address" type="string" indexed="true" stored="true" multiValued="true"/> 
 <field name="address.city" type="string" indexed="true" stored="true" />
 <field name="address.postcode" type="string" indexed="true" stored="true" />

Then when you run it you should be able to add the following JSON to your Solr instance and see the matching output in the query:

{
  "person": "John Smith",
  "address": {
      "city": "San Diego",
      "postcode": 92093
    }
}

Oubliette

if multivalued is true would it not be a list of addresses? – Ulberto

@Ulberto yes it will be, but thats the whole point right. It should have multiple childs. If there is only one child why to have even the child documents, just flatten child json. Something like: address_city and address_postcode – Pray

it's strange to declare a field as string when that (address) is another document – Groschen