11 Aug 2011 02:55:56 UTC
- Distribution: Lucy
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- Latest version++ed by:6 non-PAUSE usersCREAMYG Marvin Humphreyand 1 contributors
- The Apache Lucy Project <lucy-dev at incubator dot apache dot org>
Lucy::Docs::Tutorial::FieldType - Specify per-field properties and behaviors.
The Schema we used in the last chapter specifies three fields:
my $type = Lucy::Plan::FullTextType->new( analyzer => $polyanalyzer, ); $schema->spec_field( name => 'title', type => $type ); $schema->spec_field( name => 'content', type => $type ); $schema->spec_field( name => 'url', type => $type );
Since they are all defined as "full text" fields, they are all searchable -- including the
urlfield, a dubious choice. Some URLs contain meaningful information, but these don't, really:
We may as well not bother indexing the URL content. To achieve that we need to assign the
urlfield to a different FieldType.
Instead of FullTextType, we'll use a StringType, which doesn't use an Analyzer to break up text into individual fields. Furthermore, we'll mark this StringType as unindexed, so that its content won't be searchable at all.
my $url_type = Lucy::Plan::StringType( indexed => 0 ); $schema->spec_field( name => 'url', type => $url_type );
To observe the change in behavior, try searching for
us_constitutionboth before and after changing the Schema and re-indexing.
For a taste of other FieldType possibilities, try turning off
storedfor one or more fields.
my $content_type = Lucy::Plan::FullTextType->new( analyzer => $polyanalyzer, stored => 0, );
urlmangles our results page, but since we're not displaying
content, turning it off for
contenthas no effect -- except on index size.
Analyzers play a crucial role in the behavior of FullTextType fields. In our next tutorial chapter, Lucy::Docs::Tutorial::Analysis, we'll see how changing up the Analyzer changes search results.