Handling multiple currencies

Imagine a situation where you run an e-commerce site and sell your products all over the world. One day, you say that you want to calculate the currencies by yourself and have all the goodies that Solr gives you on all the currencies you support. You can, of course, add multiple fields, one for each currency. On the other hand, you can use the new functionality introduced in Solr 4 and create a field that will use the provided currency exchange rates. This recipe will show you how to configure and use multiple currencies using a single field in the index.

How to do it...

1. Let's start with creating a sample index structure by modifying the schema.xml file so that the field definition looks like this:

   <field name="id" type="string" indexed="true" stored="true" required="true" />
   <field name="name" type="text_general" indexed="true" stored="true" />
   <field name="price" type="currencyField" indexed="true" stored="true" />

2. In addition to this, we need...