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| 1 | <?php |
| 2 | declare(strict_types=1); |
| 3 | /** |
| 4 | * Pop PHP Framework (https://www.popphp.org/) |
| 5 | * |
| 6 | * @link https://github.com/popphp/popphp-framework |
| 7 | * @author Nick Sagona, III <nick@popphp.org> |
| 8 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 9 | * @license https://www.popphp.org/license New BSD License |
| 10 | */ |
| 11 | |
| 12 | /** |
| 13 | * @namespace |
| 14 | */ |
| 15 | namespace Pop\Db\Record\Relationships; |
| 16 | |
| 17 | use Pop\Db\Adapter\AbstractAdapter; |
| 18 | use Pop\Db\Record; |
| 19 | use Pop\Db\Sql; |
| 20 | use Pop\Db\Sql\Parser; |
| 21 | |
| 22 | /** |
| 23 | * Relationship class for "has many" relationships |
| 24 | * |
| 25 | * @category Pop |
| 26 | * @package Pop\Db |
| 27 | * @author Nick Sagona, III <nick@popphp.org> |
| 28 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 29 | * @license https://www.popphp.org/license New BSD License |
| 30 | * @version 7.0.0 |
| 31 | */ |
| 32 | class HasMany extends AbstractRelationship |
| 33 | { |
| 34 | |
| 35 | /** |
| 36 | * Parent record |
| 37 | * @var ?Record |
| 38 | */ |
| 39 | protected ?Record $parent = null; |
| 40 | |
| 41 | /** |
| 42 | * Constructor |
| 43 | * |
| 44 | * Instantiate the relationship object |
| 45 | * |
| 46 | * @param Record $parent |
| 47 | * @param string $foreignTable |
| 48 | * @param string|array $foreignKey |
| 49 | * @param ?array $options |
| 50 | */ |
| 51 | public function __construct(Record $parent, string $foreignTable, string|array $foreignKey, ?array $options = null) |
| 52 | { |
| 53 | parent::__construct($foreignTable, $foreignKey, $options); |
| 54 | $this->parent = $parent; |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * Get parent record |
| 59 | * |
| 60 | * @return ?Record |
| 61 | */ |
| 62 | public function getParent(): ?Record |
| 63 | { |
| 64 | return $this->parent; |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * Get children |
| 69 | * |
| 70 | * @param ?array $options |
| 71 | * @return Record\Collection |
| 72 | */ |
| 73 | public function getChildren(?array $options = null): Record\Collection |
| 74 | { |
| 75 | $table = $this->foreignTable; |
| 76 | |
| 77 | if (is_array($this->foreignKey)) { |
| 78 | $parentPrimaryKeys = $this->parent->getPrimaryKeys(); |
| 79 | $this->assertKeyCardinality($this->foreignKey, $parentPrimaryKeys); |
| 80 | $columns = []; |
| 81 | foreach ($this->foreignKey as $i => $fkColumn) { |
| 82 | $columns[$fkColumn] = $this->parent[$parentPrimaryKeys[$i]]; |
| 83 | } |
| 84 | } else { |
| 85 | $values = array_values($this->parent->getPrimaryValues()); |
| 86 | |
| 87 | if (count($values) == 1) { |
| 88 | $values = $values[0]; |
| 89 | } |
| 90 | |
| 91 | $columns = [$this->foreignKey => $values]; |
| 92 | } |
| 93 | |
| 94 | // An unloaded parent (e.g. Table::findById($missingId)) has no usable primary key |
| 95 | // value to look children up by - return the same empty result a real parent with no |
| 96 | // children would, without asking the database a degenerate question (RELATIONSHIP- |
| 97 | // GUARD-HANDOFF.md §1/§2). |
| 98 | if (!$this->hasUsableParentKey($columns)) { |
| 99 | return new Record\Collection(); |
| 100 | } |
| 101 | |
| 102 | if (!empty($options) && !empty($options['columns'])) { |
| 103 | $columns = array_merge($columns, $options['columns']); |
| 104 | } |
| 105 | |
| 106 | if (!empty($this->children)) { |
| 107 | return $table::with($this->children)->getBy($columns, $options); |
| 108 | } else { |
| 109 | return $table::findBy($columns, $options); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Get the value to use when no eager-loaded result exists for a given leaf record |
| 115 | * |
| 116 | * @return mixed |
| 117 | */ |
| 118 | public function getEmptyRelationshipValue(): mixed |
| 119 | { |
| 120 | return new Record\Collection(); |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * Get eager relationships |
| 125 | * |
| 126 | * @param array $ids |
| 127 | * @param bool $toArray |
| 128 | * @throws Exception |
| 129 | * @return array |
| 130 | */ |
| 131 | public function getEagerRelationships(array $ids, bool|array $toArray = false): array |
| 132 | { |
| 133 | if (($this->foreignTable === null) || ($this->foreignKey === null)) { |
| 134 | throw new Exception('Error: The foreign table and key values have not been set.'); |
| 135 | } |
| 136 | |
| 137 | // The foreign key columns on the foreign table mirror the declaring (parent) |
| 138 | // table's own primary key columns, so their counts must match — the same |
| 139 | // invariant the lazy getChildren() path asserts. |
| 140 | if (is_array($this->foreignKey)) { |
| 141 | $this->assertKeyCardinality($this->foreignKey, $this->parent->getPrimaryKeys()); |
| 142 | $this->assertTupleCardinality($ids, $this->foreignKey); |
| 143 | } |
| 144 | |
| 145 | $table = $this->foreignTable; |
| 146 | $db = $table::db(); |
| 147 | $sql = $db->createSql(); |
| 148 | $columns = null; |
| 149 | |
| 150 | if (!empty($this->options) && isset($this->options['select'])) { |
| 151 | $columns = $this->options['select']; |
| 152 | } |
| 153 | |
| 154 | $sql->select($columns)->from($table::table()); |
| 155 | |
| 156 | $params = []; |
| 157 | |
| 158 | // The options['columns'] filter is applied BEFORE the id filter so that the parameters |
| 159 | // are generated (and therefore numbered/named/ordered) in the same order the WHERE |
| 160 | // clause renders them: PredicateSet::render() always renders its top-level predicates |
| 161 | // (this filter) before its nested predicate sets (the composite tuple group), and for a |
| 162 | // single-column key both are top-level predicates rendered in insertion order. |
| 163 | $this->applyAdditionalColumnsFilter($sql, $params); |
| 164 | $this->applyEagerIdFilter($sql, $this->foreignKey, $ids, $params); |
| 165 | $this->applyQueryOptions($sql, $db); |
| 166 | |
| 167 | $db->prepare($sql) |
| 168 | ->bindParams($params) |
| 169 | ->execute(); |
| 170 | |
| 171 | return $this->hydrateRows($db->fetchAll(), $table, $toArray); |
| 172 | } |
| 173 | |
| 174 | /** |
| 175 | * Apply the options['columns'] additional WHERE filter (if any) and collect its bound values |
| 176 | * |
| 177 | * The parsed expressions carry their own dialect-correct placeholder tokens, so the SQL |
| 178 | * object's parameter counter is advanced by one per bound value to keep any placeholder |
| 179 | * generated afterward for the same statement in step with them. |
| 180 | * |
| 181 | * @param Sql $sql |
| 182 | * @param array $params |
| 183 | * @return void |
| 184 | */ |
| 185 | private function applyAdditionalColumnsFilter(Sql $sql, array &$params): void |
| 186 | { |
| 187 | if (empty($this->options) || !isset($this->options['columns'])) { |
| 188 | return; |
| 189 | } |
| 190 | |
| 191 | $additionalColumns = Parser\Expression::parseShorthand($this->options['columns'], $sql->getPlaceholder()); |
| 192 | |
| 193 | if (!empty($additionalColumns['expressions'])) { |
| 194 | foreach ($additionalColumns['expressions'] as $expression) { |
| 195 | $sql->select()->where($expression); |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | foreach ($additionalColumns['params'] as $key => $value) { |
| 200 | if (is_string($key)) { |
| 201 | $params[$key] = $value; |
| 202 | } else { |
| 203 | $params[] = $value; |
| 204 | } |
| 205 | $sql->incrementParameterCount(); |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Apply the limit, offset, join, and order options (if any) |
| 211 | * |
| 212 | * @param Sql $sql |
| 213 | * @param AbstractAdapter $db |
| 214 | * @return void |
| 215 | */ |
| 216 | private function applyQueryOptions(Sql $sql, AbstractAdapter $db): void |
| 217 | { |
| 218 | if (empty($this->options)) { |
| 219 | return; |
| 220 | } |
| 221 | |
| 222 | if (isset($this->options['limit'])) { |
| 223 | $sql->select()->limit((int)$this->options['limit']); |
| 224 | } |
| 225 | |
| 226 | if (isset($this->options['offset'])) { |
| 227 | $sql->select()->offset((int)$this->options['offset']); |
| 228 | } |
| 229 | |
| 230 | if (isset($this->options['join'])) { |
| 231 | $joins = (is_array($this->options['join']) && isset($this->options['join']['table'])) ? |
| 232 | [$this->options['join']] : $this->options['join']; |
| 233 | |
| 234 | foreach ($joins as $join) { |
| 235 | if (isset($join['type']) && method_exists($sql->select(), $join['type'])) { |
| 236 | $joinMethod = $join['type']; |
| 237 | $sql->select()->{$joinMethod}($join['table'], $join['columns']); |
| 238 | } else { |
| 239 | $sql->select()->leftJoin($join['table'], $join['columns']); |
| 240 | } |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | if (isset($this->options['order'])) { |
| 245 | if (!is_array($this->options['order'])) { |
| 246 | $orders = (str_contains($this->options['order'], ',')) ? |
| 247 | explode(',', $this->options['order']) : [$this->options['order']]; |
| 248 | } else { |
| 249 | $orders = $this->options['order']; |
| 250 | } |
| 251 | foreach ($orders as $order) { |
| 252 | $ord = Parser\Order::parse(trim($order)); |
| 253 | $sql->select()->orderBy($ord['by'], $db->escape($ord['order'])); |
| 254 | } |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | /** |
| 259 | * Hydrate the fetched rows into a per-parent-key map of Collections (or raw arrays), and |
| 260 | * eager-load any nested child relationships on the resulting leaf records |
| 261 | * |
| 262 | * @param array $rows |
| 263 | * @param string $table |
| 264 | * @param bool|array $toArray |
| 265 | * @return array |
| 266 | */ |
| 267 | private function hydrateRows(array $rows, string $table, bool|array $toArray): array |
| 268 | { |
| 269 | $results = []; |
| 270 | $leafRecords = []; |
| 271 | |
| 272 | // The leaf records are rows of the foreign table, so their own primary key |
| 273 | // columns (NOT this relationship's foreign key columns, which name columns |
| 274 | // on the declaring side) are what nested child relationships look them up by. |
| 275 | $primaryKey = (new $table())->getPrimaryKeys(); |
| 276 | $primaryKey = (count($primaryKey) == 1) ? reset($primaryKey) : $primaryKey; |
| 277 | |
| 278 | foreach ($rows as $row) { |
| 279 | $key = is_array($this->foreignKey) ? |
| 280 | self::buildCompositeKey(array_map(fn($col) => $row[$col], $this->foreignKey)) : |
| 281 | $row[$this->foreignKey]; |
| 282 | |
| 283 | if ($toArray === false) { |
| 284 | if (!isset($results[$key])) { |
| 285 | $results[$key] = new Record\Collection(); |
| 286 | } |
| 287 | $record = new $table(); |
| 288 | $record->setColumns($row); |
| 289 | $results[$key]->push($record); |
| 290 | $leafRecords[] = $record; |
| 291 | } else { |
| 292 | if (!isset($results[$key])) { |
| 293 | $results[$key] = []; |
| 294 | } |
| 295 | $results[$key][] = $row; |
| 296 | } |
| 297 | } |
| 298 | |
| 299 | $this->hydrateChildRelationships($leafRecords, $primaryKey); |
| 300 | |
| 301 | return $results; |
| 302 | } |
| 303 | |
| 304 | } |