Question

I m using apache solr search engine for indexing my website database..

I m using django+http://haystacksearch.org/

So let s say I have document that have word "Chicken"

When I search for "chicken" - solr can find this document

But When I search "chick" - it does not find anything..

Is there a way to fix this ?

Answer 1

Note: The following solution is Solr 1.4 (and above) specific!

For more flexibility, I would recommend indexing your data with the NGramTokenizerFactory to do complete front and back wildcard searches. If you just want to search for substrings at the beginning or end of the string, consider using the EdgeNGramTokenizerFactory.

Here s a drop in replacement of the text field type which would accomodate your need:

<fieldType name="text" class="solr.TextField" >
<analyzer type="index">
    <tokenizer class="solr.NGramTokenizerFactory" minGramSize="3" maxGramSize="15" />
    <filter class="solr.LowerCaseFilterFactory"/>
</analyzer>
<analyzer type="query">
    <tokenizer class="solr.WhitespaceTokenizerFactory" />
    <filter class="solr.LowerCaseFilterFactory"/>
</analyzer>
</fieldType>

Answer 2

If you want to find all words that start with chick, search for chick*.

Answer 3

When I ve used

<tokenizer class="solr.NGramTokenizerFactory" minGramSize="3" maxGramSize="15" />

for making wildcard search from Brian s answer, Solr indexing time dramaticly increased. In more than 20 times! The other decision of wildcard searching problem I found here:

http://www.lucidimagination.com/blog/2009/09/08/auto-suggest-from-popular-queries-using-edgengrams/

You need just add filter

<filter class="solr.EdgeNGramFilterFactory" minGramSize="1" maxGramSize="25" />

(default tokenizer - solr.WhitespaceTokenizerFactory in index block of FieldType). For me result was the same with less system costs.

Answer 4

A different approach, if you are having trouble with a small set of words, would be to use the solr.SynonymFilterFactory

http://wiki.apache.org/solr/AnalyzersTokenizersTokenFilters#solr.SynonymFilterFactory

You just have to maintain a simple text file that contains synonyms:

chick peep chicken
dawg hound dog
moggie puss kitten cat

Plurals should take care of themselves with other filters.

Answer 5

I haven t changed any configuration. I am just using star in front and in the back of my searchString: *chicke * (without white space at the end -> it s because of SO formatting word as italic if you use * at the beginning and at the end)

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