Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like ActiveQuery often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use ActiveQuery, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 18 | class ActiveQuery extends Query implements ActiveQueryInterface |
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| 19 | { |
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| 20 | use ActiveQueryTrait; |
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| 21 | use ActiveRelationTrait; |
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| 22 | |||
| 23 | /** |
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| 24 | * @event Event an event that is triggered when the query is initialized via [[init()]]. |
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| 25 | */ |
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| 26 | const EVENT_INIT = 'init'; |
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| 27 | |||
| 28 | /** |
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| 29 | * @var array|null a list of relations that this query should be joined with |
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| 30 | */ |
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| 31 | public $joinWith = []; |
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| 32 | |||
| 33 | /** |
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| 34 | * Constructor. |
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| 35 | * @param string $modelClass the model class associated with this query |
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| 36 | * @param array $config configurations to be applied to the newly created query object |
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| 37 | */ |
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| 38 | 2 | public function __construct($modelClass, $config = []) |
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| 44 | |||
| 45 | /** |
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| 46 | * Initializes the object. |
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| 47 | * This method is called at the end of the constructor. The default implementation will trigger |
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| 48 | * an [[EVENT_INIT]] event. If you override this method, make sure you call the parent implementation at the end |
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| 49 | * to ensure triggering of the event. |
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| 50 | */ |
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| 51 | 2 | public function init() |
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| 56 | |||
| 57 | /** |
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| 58 | * Creates a DB command that can be used to execute this query. |
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| 59 | * @param AbstractConnection $db the DB connection used to create the DB command. |
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| 60 | * If null, the DB connection returned by [[modelClass]] will be used. |
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| 61 | * @return Command the created DB command instance |
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| 62 | */ |
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| 63 | 2 | public function createCommand($db = null) |
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| 97 | |||
| 98 | /** |
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| 99 | * Prepares query for use. See NOTE. |
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| 100 | * @param QueryBuilder $builder |
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| 101 | * @return static |
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| 102 | */ |
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| 103 | 2 | public function prepare($builder = null) |
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| 116 | |||
| 117 | /** |
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| 118 | * @param $with |
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| 119 | * @return static |
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| 120 | */ |
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| 121 | public function joinWith($with) |
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| 127 | |||
| 128 | private function buildJoinWith() |
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| 165 | |||
| 166 | /** |
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| 167 | * @param ActiveRecord $model |
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| 168 | * @param $with |
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| 169 | */ |
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| 170 | protected function joinWithRelations($model, $with) |
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| 193 | |||
| 194 | /** |
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| 195 | * Joins a parent query with a child query. |
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| 196 | * The current query object will be modified accordingly. |
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| 197 | * @param ActiveQuery $parent |
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| 198 | * @param ActiveQuery $child |
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| 199 | */ |
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| 200 | private function joinWithRelation($parent, $child) |
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| 208 | |||
| 209 | public function select($columns, $option = null) |
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| 215 | |||
| 216 | /** |
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| 217 | * @param array|string $columns |
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| 218 | * @return $this |
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| 219 | */ |
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| 220 | public function addSelect($columns) |
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| 234 | |||
| 235 | /** |
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| 236 | * Executes query and returns a single row of result. |
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| 237 | * |
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| 238 | * @param AbstractConnection $db the DB connection used to create the DB command. |
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| 239 | * If null, the DB connection returned by [[modelClass]] will be used. |
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| 240 | * @return ActiveRecord|array|null a single row of query result. Depending on the setting of [[asArray]], |
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| 241 | * the query result may be either an array or an ActiveRecord object. Null will be returned |
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| 242 | * if the query results in nothing. |
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| 243 | */ |
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| 244 | public function one($db = null) |
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| 257 | |||
| 258 | /** |
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| 259 | * Executes query and returns all results as an array. |
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| 260 | * @param AbstractConnection $db the DB connection used to create the DB command. |
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| 261 | * If null, the DB connection returned by [[modelClass]] will be used. |
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| 262 | * @return array|ActiveRecord[] the query results. If the query results in nothing, an empty array will be returned. |
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| 263 | */ |
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| 264 | 2 | public function all($db = null) |
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| 274 | |||
| 275 | 2 | public function populate($rows) |
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| 293 | |||
| 294 | 2 | private function createModels($rows) |
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| 317 | |||
| 318 | /** |
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| 319 | * Populates joined relations from [[join]] array. |
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| 320 | * |
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| 321 | * @param ActiveRecord $model |
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| 322 | * @param array $row |
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| 323 | */ |
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| 324 | 2 | public function populateJoinedRelations($model, array $row) |
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| 381 | |||
| 382 | /** |
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| 383 | * @param $relatedModel |
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| 384 | */ |
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| 385 | private function addInverseRelation($relatedModel) |
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| 394 | } |
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| 395 |
Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property.
Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property..