Provided by: liblucy-perl_0.3.3-8build1_amd64
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 "url" field, a dubious choice. Some URLs contain meaningful information, but these don't, really: http://example.com/us_constitution/amend1.txt We may as well not bother indexing the URL content. To achieve that we need to assign the "url" field to a different FieldType. StringType 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->new( indexed => 0 ); $schema->spec_field( name => 'url', type => $url_type ); To observe the change in behavior, try searching for "us_constitution" both before and after changing the Schema and re-indexing. Toggling 'stored' For a taste of other FieldType possibilities, try turning off "stored" for one or more fields. my $content_type = Lucy::Plan::FullTextType->new( analyzer => $polyanalyzer, stored => 0, ); Turning off "stored" for either "title" or "url" mangles our results page, but since we're not displaying "content", turning it off for "content" has no effect -- except on index size. Analyzers up next 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.