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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\elasticsearch;
use Yii;
use yii\base\Component;
use yii\base\NotSupportedException;
use yii\db\QueryInterface;
use yii\db\QueryTrait;
/**
* Query represents a query to the search API of elasticsearch.
*
* Query provides a set of methods to facilitate the specification of different parameters of the query.
* These methods can be chained together.
*
* By calling [[createCommand()]], we can get a [[Command]] instance which can be further
* used to perform/execute the DB query against a database.
*
* For example,
*
* ~~~
* $query = new Query;
* $query->fields('id, name')
* ->from('myindex', 'users')
* ->limit(10);
* // build and execute the query
* $command = $query->createCommand();
* $rows = $command->search(); // this way you get the raw output of elasticsearch.
* ~~~
*
* You would normally call `$query->search()` instead of creating a command as this method
* adds the `indexBy()` feature and also removes some inconsistencies from the response.
*
* Query also provides some methods to easier get some parts of the result only:
*
* - [[one()]]: returns a single record populated with the first row of data.
* - [[all()]]: returns all records based on the query results.
* - [[count()]]: returns the number of records.
* - [[scalar()]]: returns the value of the first column in the first row of the query result.
* - [[column()]]: returns the value of the first column in the query result.
* - [[exists()]]: returns a value indicating whether the query result has data or not.
*
* NOTE: elasticsearch limits the number of records returned to 10 records by default.
* If you expect to get more records you should specify limit explicitly.
*
* @author Carsten Brandt <mail@cebe.cc>
* @since 2.0
*/
class Query extends Component implements QueryInterface
{
use QueryTrait;
/**
* @var array the fields being retrieved from the documents. For example, `['id', 'name']`.
* If not set, this option will not be applied to the query and no fields will be returned.
* In this case the `_source` field will be returned by default which can be configured using [[source]].
* Setting this to an empty array will result in no fields being retrieved, which means that only the primaryKey
* of a record will be available in the result.
*
* For each field you may also add an array representing a [script field]. Example:
*
* ```php
* $query->fields = [
* 'id',
* 'name',
* 'value_times_two' => [
* 'script' => "doc['my_field_name'].value * 2",
* ],
* 'value_times_factor' => [
* 'script' => "doc['my_field_name'].value * factor",
* 'params' => [
* 'factor' => 2.0
* ],
* ],
* ]
* ```
*
* > Note: Field values are [always returned as arrays] even if they only have one value.
*
* [always returned as arrays]: http://www.elasticsearch.org/guide/en/elasticsearch/reference/1.x/_return_values.html#_return_values
* [script field]: http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-script-fields.html
*
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-fields.html#search-request-fields
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-script-fields.html
* @see fields()
* @see source
*/
public $fields;
/**
* @var array this option controls how the `_source` field is returned from the documents. For example, `['id', 'name']`
* means that only the `id` and `name` field should be returned from `_source`.
* If not set, it means retrieving the full `_source` field unless [[fields]] are specified.
* Setting this option to `false` will disable return of the `_source` field, this means that only the primaryKey
* of a record will be available in the result.
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-source-filtering.html
* @see source()
* @see fields
*/
public $source;
/**
* @var string|array The index to retrieve data from. This can be a string representing a single index
* or a an array of multiple indexes. If this is not set, indexes are being queried.
* @see from()
*/
public $index;
/**
* @var string|array The type to retrieve data from. This can be a string representing a single type
* or a an array of multiple types. If this is not set, all types are being queried.
* @see from()
*/
public $type;
/**
* @var integer A search timeout, bounding the search request to be executed within the specified time value
* and bail with the hits accumulated up to that point when expired. Defaults to no timeout.
* @see timeout()
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-body.html#_parameters_3
*/
public $timeout;
/**
* @var array|string The query part of this search query. This is an array or json string that follows the format of
* the elasticsearch [Query DSL](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl.html).
*/
public $query;
/**
* @var array|string The filter part of this search query. This is an array or json string that follows the format of
* the elasticsearch [Query DSL](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl.html).
*/
public $filter;
/**
* @var array The highlight part of this search query. This is an array that allows to highlight search results
* on one or more fields.
*/
public $highlight;
public $facets = [];
public function init()
{
parent::init();
// setting the default limit according to elasticsearch defaults
// http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-body.html#_parameters_3
if ($this->limit === null) {
$this->limit = 10;
}
}
/**
* Creates a DB command that can be used to execute this query.
* @param Connection $db the database connection used to execute the query.
* If this parameter is not given, the `elasticsearch` application component will be used.
* @return Command the created DB command instance.
*/
public function createCommand($db = null)
{
if ($db === null) {
$db = Yii::$app->get('elasticsearch');
}
$commandConfig = $db->getQueryBuilder()->build($this);
return $db->createCommand($commandConfig);
}
/**
* Executes the query and returns all results as an array.
* @param Connection $db the database connection used to execute the query.
* If this parameter is not given, the `elasticsearch` application component will be used.
* @return array the query results. If the query results in nothing, an empty array will be returned.
*/
public function all($db = null)
{
$result = $this->createCommand($db)->search();
if (empty($result['hits']['hits'])) {
return [];
}
$rows = $result['hits']['hits'];
if ($this->indexBy === null) {
return $rows;
}
$models = [];
foreach ($rows as $key => $row) {
if ($this->indexBy !== null) {
if (is_string($this->indexBy)) {
$key = isset($row['fields'][$this->indexBy]) ? reset($row['fields'][$this->indexBy]) : $row['_source'][$this->indexBy];
} else {
$key = call_user_func($this->indexBy, $row);
}
}
$models[$key] = $row;
}
return $models;
}
/**
* Executes the query and returns a single row of result.
* @param Connection $db the database connection used to execute the query.
* If this parameter is not given, the `elasticsearch` application component will be used.
* @return array|boolean the first row (in terms of an array) of the query result. False is returned if the query
* results in nothing.
*/
public function one($db = null)
{
$result = $this->createCommand($db)->search(['size' => 1]);
if (empty($result['hits']['hits'])) {
return false;
}
$record = reset($result['hits']['hits']);
return $record;
}
/**
* Executes the query and returns the complete search result including e.g. hits, facets, totalCount.
* @param Connection $db the database connection used to execute the query.
* If this parameter is not given, the `elasticsearch` application component will be used.
* @param array $options The options given with this query. Possible options are:
*
* - [routing](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search.html#search-routing)
* - [search_type](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-search-type.html)
*
* @return array the query results.
*/
public function search($db = null, $options = [])
{
$result = $this->createCommand($db)->search($options);
if (!empty($result['hits']['hits']) && $this->indexBy !== null) {
$rows = [];
foreach ($result['hits']['hits'] as $key => $row) {
if (is_string($this->indexBy)) {
$key = isset($row['fields'][$this->indexBy]) ? $row['fields'][$this->indexBy] : $row['_source'][$this->indexBy];
} else {
$key = call_user_func($this->indexBy, $row);
}
$rows[$key] = $row;
}
$result['hits']['hits'] = $rows;
}
return $result;
}
// TODO add query stats http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search.html#stats-groups
// TODO add scroll/scan http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-search-type.html#scan
/**
* Executes the query and deletes all matching documents.
*
* This will not run facet queries.
*
* @param Connection $db the database connection used to execute the query.
* If this parameter is not given, the `elasticsearch` application component will be used.
* @return array the query results. If the query results in nothing, an empty array will be returned.
*/
public function delete($db = null)
{
// TODO implement http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/docs-delete-by-query.html
throw new NotSupportedException('Delete by query is not implemented yet.');
}
/**
* Returns the query result as a scalar value.
* The value returned will be the specified field in the first document of the query results.
* @param string $field name of the attribute to select
* @param Connection $db the database connection used to execute the query.
* If this parameter is not given, the `elasticsearch` application component will be used.
* @return string the value of the specified attribute in the first record of the query result.
* Null is returned if the query result is empty or the field does not exist.
*/
public function scalar($field, $db = null)
{
$record = self::one($db);
if ($record !== false) {
if ($field === '_id') {
return $record['_id'];
} elseif (isset($record['_source'][$field])) {
return $record['_source'][$field];
} elseif (isset($record['fields'][$field])) {
return count($record['fields'][$field]) == 1 ? reset($record['fields'][$field]) : $record['fields'][$field];
}
}
return null;
}
/**
* Executes the query and returns the first column of the result.
* @param string $field the field to query over
* @param Connection $db the database connection used to execute the query.
* If this parameter is not given, the `elasticsearch` application component will be used.
* @return array the first column of the query result. An empty array is returned if the query results in nothing.
*/
public function column($field, $db = null)
{
$command = $this->createCommand($db);
$command->queryParts['_source'] = [$field];
$result = $command->search();
if (empty($result['hits']['hits'])) {
return [];
}
$column = [];
foreach ($result['hits']['hits'] as $row) {
$column[] = isset($row['_source'][$field]) ? $row['_source'][$field] : null;
}
return $column;
}
/**
* Returns the number of records.
* @param string $q the COUNT expression. This parameter is ignored by this implementation.
* @param Connection $db the database connection used to execute the query.
* If this parameter is not given, the `elasticsearch` application component will be used.
* @return integer number of records
*/
public function count($q = '*', $db = null)
{
// TODO consider sending to _count api instead of _search for performance
// only when no facety are registerted.
// http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-count.html
$options = [];
$options['search_type'] = 'count';
return $this->createCommand($db)->search($options)['hits']['total'];
}
/**
* Returns a value indicating whether the query result contains any row of data.
* @param Connection $db the database connection used to execute the query.
* If this parameter is not given, the `elasticsearch` application component will be used.
* @return boolean whether the query result contains any row of data.
*/
public function exists($db = null)
{
return self::one($db) !== false;
}
/**
* Adds a facet search to this query.
* @param string $name the name of this facet
* @param string $type the facet type. e.g. `terms`, `range`, `histogram`...
* @param string|array $options the configuration options for this facet. Can be an array or a json string.
* @return static the query object itself
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-facets-query-facet.html
*/
public function addFacet($name, $type, $options)
{
$this->facets[$name] = [$type => $options];
return $this;
}
/**
* The `terms facet` allow to specify field facets that return the N most frequent terms.
* @param string $name the name of this facet
* @param array $options additional option. Please refer to the elasticsearch documentation for details.
* @return static the query object itself
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-facets-terms-facet.html
*/
public function addTermFacet($name, $options)
{
return $this->addFacet($name, 'terms', $options);
}
/**
* Range facet allows to specify a set of ranges and get both the number of docs (count) that fall
* within each range, and aggregated data either based on the field, or using another field.
* @param string $name the name of this facet
* @param array $options additional option. Please refer to the elasticsearch documentation for details.
* @return static the query object itself
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-facets-range-facet.html
*/
public function addRangeFacet($name, $options)
{
return $this->addFacet($name, 'range', $options);
}
/**
* The histogram facet works with numeric data by building a histogram across intervals of the field values.
* Each value is "rounded" into an interval (or placed in a bucket), and statistics are provided per
* interval/bucket (count and total).
* @param string $name the name of this facet
* @param array $options additional option. Please refer to the elasticsearch documentation for details.
* @return static the query object itself
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-facets-histogram-facet.html
*/
public function addHistogramFacet($name, $options)
{
return $this->addFacet($name, 'histogram', $options);
}
/**
* A specific histogram facet that can work with date field types enhancing it over the regular histogram facet.
* @param string $name the name of this facet
* @param array $options additional option. Please refer to the elasticsearch documentation for details.
* @return static the query object itself
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-facets-date-histogram-facet.html
*/
public function addDateHistogramFacet($name, $options)
{
return $this->addFacet($name, 'date_histogram', $options);
}
/**
* A filter facet (not to be confused with a facet filter) allows you to return a count of the hits matching the filter.
* The filter itself can be expressed using the Query DSL.
* @param string $name the name of this facet
* @param string $filter the query in Query DSL
* @return static the query object itself
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-facets-filter-facet.html
*/
public function addFilterFacet($name, $filter)
{
return $this->addFacet($name, 'filter', $filter);
}
/**
* A facet query allows to return a count of the hits matching the facet query.
* The query itself can be expressed using the Query DSL.
* @param string $name the name of this facet
* @param string $query the query in Query DSL
* @return static the query object itself
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-facets-query-facet.html
*/
public function addQueryFacet($name, $query)
{
return $this->addFacet($name, 'query', $query);
}
/**
* Statistical facet allows to compute statistical data on a numeric fields. The statistical data include count,
* total, sum of squares, mean (average), minimum, maximum, variance, and standard deviation.
* @param string $name the name of this facet
* @param array $options additional option. Please refer to the elasticsearch documentation for details.
* @return static the query object itself
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-facets-statistical-facet.html
*/
public function addStatisticalFacet($name, $options)
{
return $this->addFacet($name, 'statistical', $options);
}
/**
* The `terms_stats` facet combines both the terms and statistical allowing to compute stats computed on a field,
* per term value driven by another field.
* @param string $name the name of this facet
* @param array $options additional option. Please refer to the elasticsearch documentation for details.
* @return static the query object itself
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-facets-terms-stats-facet.html
*/
public function addTermsStatsFacet($name, $options)
{
return $this->addFacet($name, 'terms_stats', $options);
}
/**
* The `geo_distance` facet is a facet providing information for ranges of distances from a provided `geo_point`
* including count of the number of hits that fall within each range, and aggregation information (like `total`).
* @param string $name the name of this facet
* @param array $options additional option. Please refer to the elasticsearch documentation for details.
* @return static the query object itself
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-facets-geo-distance-facet.html
*/
public function addGeoDistanceFacet($name, $options)
{
return $this->addFacet($name, 'geo_distance', $options);
}
// TODO add suggesters http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-suggesters.html
// TODO add validate query http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-validate.html
// TODO support multi query via static method http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-multi-search.html
/**
* Sets the querypart of this search query.
* @param string $query
* @return static the query object itself
*/
public function query($query)
{
$this->query = $query;
return $this;
}
/**
* Sets the filter part of this search query.
* @param string $filter
* @return static the query object itself
*/
public function filter($filter)
{
$this->filter = $filter;
return $this;
}
/**
* Sets the index and type to retrieve documents from.
* @param string|array $index The index to retrieve data from. This can be a string representing a single index
* or a an array of multiple indexes. If this is `null` it means that all indexes are being queried.
* @param string|array $type The type to retrieve data from. This can be a string representing a single type
* or a an array of multiple types. If this is `null` it means that all types are being queried.
* @return static the query object itself
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-search.html#search-multi-index-type
*/
public function from($index, $type = null)
{
$this->index = $index;
$this->type = $type;
return $this;
}
/**
* Sets the fields to retrieve from the documents.
* @param array $fields the fields to be selected.
* @return static the query object itself
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-fields.html
*/
public function fields($fields)
{
if (is_array($fields) || $fields === null) {
$this->fields = $fields;
} else {
$this->fields = func_get_args();
}
return $this;
}
/**
* Sets a highlight parameters to retrieve from the documents.
* @param array $highlight array of parameters to highlight results.
* @return static the query object itself
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-highlighting.html
*/
public function highlight($highlight)
{
$this->highlight = $highlight;
return $this;
}
/**
* Sets the source filtering, specifying how the `_source` field of the document should be returned.
* @param array $source the source patterns to be selected.
* @return static the query object itself
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-source-filtering.html
*/
public function source($source)
{
if (is_array($source) || $source === null) {
$this->source = $source;
} else {
$this->source = func_get_args();
}
return $this;
}
/**
* Sets the search timeout.
* @param integer $timeout A search timeout, bounding the search request to be executed within the specified time value
* and bail with the hits accumulated up to that point when expired. Defaults to no timeout.
* @return static the query object itself
* @see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-body.html#_parameters_3
*/
public function timeout($timeout)
{
$this->timeout = $timeout;
return $this;
}
}