$key public property
The column that is used as the key of the data models. This can be either a column name, or a callable that returns the key value of a given data model.
If this is not set, the following rules will be used to determine the keys of the data models:
- If $query is an yii\db\ActiveQuery instance, the primary keys of yii\db\ActiveQuery::$modelClass will be used.
- Otherwise, the keys of the $models array will be used.
See also getKeys().
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