Switch Query Parser - quick look | Solr Enterprise Search

Switch Query Parser – quick look | Solr Enterprise Search

Logic behind the parser

The logic of the SwitchQueryParser is quite simple – allow processing a simple logic on the Solr side and add it as a sub-query. For example let’s say that we have an application that understand the following four values of the priceRangefield:

• cheap – when the price of the product (indexed in the price field) is lower than 10$,
• average – when the price is between 10 and 30$,
• expensive – when the product price is higher than  30$,
• all – in case we want to return all the documents without looking at the price.

We want to have this logic stored in Solr somehow in order not to change our application or its configuration every time we want to change the above ranges.

http://localhost:8983/solr/collection1/price?q=*:*&priceRange=cheap

<requestHandler name="/price">

2	<lst name="defaults">

3	<str name="priceRange">all</str>

4

</lst>

5	<lst name="appends">

6	<str name="fq">{!switch case.all='price:[* TO *]' case.cheap='price:[0 TO 10]' case.average='price:[10 TO 30]' case.expensive='price:[30 TO *]' v=$priceRange}</str>

7

</lst>

8	</requestHandler>

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