1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
<?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.
*
* @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, it means retrieving all fields. An empty array will result in no fields being
* retrieved. 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-fields.html#search-request-fields
* @see fields()
*/
public $fields;
/**
* @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;
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->getComponent('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 && $this->fields === null) {
return $rows;
}
$models = [];
foreach ($rows as $key => $row) {
if ($this->fields !== null) {
$row['_source'] = isset($row['fields']) ? $row['fields'] : [];
unset($row['fields']);
}
if ($this->indexBy !== null) {
if (is_string($this->indexBy)) {
$key = $row['_source'][$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)
{
$options['size'] = 1;
$result = $this->createCommand($db)->search($options);
if (empty($result['hits']['hits'])) {
return false;
}
$record = reset($result['hits']['hits']);
if ($this->fields !== null) {
$record['_source'] = isset($record['fields']) ? $record['fields'] : [];
unset($record['fields']);
}
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 || $this->fields === null)) {
$rows = [];
foreach ($result['hits']['hits'] as $key => $row) {
if ($this->fields !== null) {
$row['_source'] = isset($row['fields']) ? $row['fields'] : [];
unset($row['fields']);
}
if ($this->indexBy !== null) {
if (is_string($this->indexBy)) {
$key = $row['_source'][$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); // TODO limit fields to the one required
if ($record !== false && isset($record['_source'][$field])) {
return $record['_source'][$field];
} else {
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);
$command->queryParts['fields'] = [$field];
$result = $command->search();
if (empty($result['hits']['hits'])) {
return [];
}
$column = [];
foreach ($result['hits']['hits'] as $row) {
$column[] = isset($row['fields'][$field]) ? $row['fields'][$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 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;
}
}