NAME
KinoSearch::Docs::Tutorial::FieldType - Specify per-field properties and behaviors.
DEPRECATED
The KinoSearch code base has been assimilated by the Apache Lucy project. The "KinoSearch" namespace has been deprecated, but development continues under our new name at our new home: http://lucy.apache.org/
DESCRIPTION
The Schema we used in the last chapter specifies three fields:
my $type = KinoSearch::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 = KinoSearch::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 = KinoSearch::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, KinoSearch::Docs::Tutorial::Analysis, we'll see how changing up the Analyzer changes search results.
COPYRIGHT AND LICENSE
Copyright 2008-2011 Marvin Humphrey
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.