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04 Sep 2014 00:12:31 UTC
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Bus factor: 1- License: apache_2_0
- Perl: v5.8.3
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NAME
Lucy::Docs::Tutorial::FieldType - Specify per-field properties and behaviors.
DESCRIPTION
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 eithertitle
orurl
mangles our results page, but since we're not displayingcontent
, turning it off forcontent
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.
Module Install Instructions
To install Lucy::Simple, copy and paste the appropriate command in to your terminal.
cpanm Lucy::Simple
perl -MCPAN -e shell install Lucy::Simple
For more information on module installation, please visit the detailed CPAN module installation guide.