Nicolas Steenlant > Catmandu-Store-ElasticSearch-0.0206 > Catmandu::Store::ElasticSearch

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Module Version: 0.0206   Source  

NAME ^

Catmandu::Store::ElasticSearch - A searchable store backed by Elasticsearch

DEPRECIATION NOTICE ^

This is the last version of Catmandu::Store::ElasticSearch. Development will continue as Catmandu::Store::Elasticsearch using the official Search::Elasticsearch client.

VERSION ^

Version 0.0206

SYNOPSIS ^

    use Catmandu::Store::ElasticSearch;

    my $store = Catmandu::Store::ElasticSearch->new(index_name => 'catmandu');

    my $obj1 = $store->bag->add({ name => 'Patrick' });

    printf "obj1 stored as %s\n" , $obj1->{_id};

    # Force an id in the store
    my $obj2 = $store->bag->add({ _id => 'test123' , name => 'Nicolas' });

    # Commit all changes
    $store->bag->commit;

    my $obj3 = $store->bag->get('test123');

    $store->bag->delete('test123');

    $store->bag->delete_all;

    # All bags are iterators
    $store->bag->each(sub { ... });
    $store->bag->take(10)->each(sub { ... });

    # Some stores can be searched
    my $hits = $store->bag->search(query => 'name:Patrick');

    # Catmandu::Store::ElasticSearch supports CQL...
    my $hits = $store->bag->search(cql_query => 'name any "Patrick"');

METHODS ^

new(index_name => $name)

new(index_name => $name , bags => { data => { cql_mapping => \%mapping } })

new(index_name => $name , index_mapping => $mapping)

Create a new Catmandu::Store::ElasticSearch store connected to index $name.

The store supports CQL searches when a cql_mapping is provided. This hash contains a translation of CQL fields into Elasticsearch searchable fields.

 # Example mapping
 $cql_mapping = {
      title => {
        op => {
          'any'   => 1 ,
          'all'   => 1 ,
          '='     => 1 ,
          '<>'    => 1 ,
          'exact' => {field => [qw(mytitle.exact myalttitle.exact)]}
        } ,
        sort  => 1,
        field => 'mytitle',
        cb    => ['Biblio::Search', 'normalize_title']
      }
 }

The CQL mapping above will support for the 'title' field the CQL operators: any, all, =, <> and exact.

For all the operators the 'title' field will be mapping into the Elasticsearch field 'mytitle', except for the 'exact' operator. In case of 'exact' we will search both the 'mytitle.exact' and 'myalttitle.exact' fields.

The CQL mapping allows for sorting on the 'title' field. If, for instance, we would like to use a special Elasticsearch field for sorting we could have written "sort => { field => 'mytitle.sort' }".

The CQL has an optional callback field 'cb' which contains a reference to subroutines to rewrite or augment the search query. In this case, in the Biblio::Search package there is a normalize_title subroutine which returns a string or an ARRAY of string with augmented title(s). E.g.

    package Biblio::Search;

    sub normalize_title {
       my ($self,$title) = @_;
       my $new_title =~ s{[^A-Z0-9]+}{}g;
       $new_title;
    }

    1;

Optionally, index_mappings contain Elastic Search schema mappings. E.g.

    # The 'data' index can ony contain one field 'title' of type 'string'
    index_mappings => {
        data => {
            dynamic => 'strict',
            properties => {
                title => { type => 'string' }
            }
        }
    }

drop

Deletes the elasticsearch index backing this store. Calling functions after this may fail until this class is reinstantiated, creating a new index.

ERROR HANDLING ^

Error handling can be activated by specifying an error handling callback for index when creating a store. E.g. to create an error handler for the bag 'data' index use:

    my $store = Catmandu::Store::ElasticSearch->new(
                    index_name => 'catmandu'
                    bags => { data => { on_error => \&error_handler } }
                 });

    sub error_handler {
        my ($action, $document, $error, $req_no ) = @_;

    }

See: http://search.cpan.org/~drtech/ElasticSearch-0.68/lib/ElasticSearch.pm#Error_handlers for more information.

SEE ALSO ^

Catmandu::Store

AUTHOR ^

Nicolas Steenlant, <nicolas.steenlant at ugent.be>

CONTRIBUTORS ^

Dave Sherohman, dave.sherohman at ub.lu.se
Robin Sheat, robin at kallisti.net.nz
Patrick Hochstenbach, patrick.hochstenbach at ugent.be

LICENSE AND COPYRIGHT ^

This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.

See http://dev.perl.org/licenses/ for more information.

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