332 lines
9.6 KiB
PHP
332 lines
9.6 KiB
PHP
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<?php
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namespace Illuminate\Database\Eloquent\Relations\Concerns;
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use Closure;
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use Illuminate\Database\Eloquent\Builder;
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use Illuminate\Database\Query\JoinClause;
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use Illuminate\Support\Arr;
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use InvalidArgumentException;
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trait CanBeOneOfMany
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{
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/**
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* Determines whether the relationship is one-of-many.
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*
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* @var bool
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*/
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protected $isOneOfMany = false;
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/**
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* The name of the relationship.
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*
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* @var string
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*/
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protected $relationName;
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/**
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* The one of many inner join subselect query builder instance.
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*
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* @var \Illuminate\Database\Eloquent\Builder|null
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*/
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protected $oneOfManySubQuery;
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/**
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* Add constraints for inner join subselect for one of many relationships.
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*
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* @param \Illuminate\Database\Eloquent\Builder $query
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* @param string|null $column
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* @param string|null $aggregate
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* @return void
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*/
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abstract public function addOneOfManySubQueryConstraints(Builder $query, $column = null, $aggregate = null);
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/**
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* Get the columns the determine the relationship groups.
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*
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* @return array|string
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*/
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abstract public function getOneOfManySubQuerySelectColumns();
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/**
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* Add join query constraints for one of many relationships.
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*
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* @param \Illuminate\Database\Query\JoinClause $join
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* @return void
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*/
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abstract public function addOneOfManyJoinSubQueryConstraints(JoinClause $join);
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/**
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* Indicate that the relation is a single result of a larger one-to-many relationship.
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*
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* @param string|array|null $column
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* @param string|\Closure|null $aggregate
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* @param string|null $relation
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* @return $this
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*
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* @throws \InvalidArgumentException
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*/
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public function ofMany($column = 'id', $aggregate = 'MAX', $relation = null)
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{
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$this->isOneOfMany = true;
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$this->relationName = $relation ?: $this->getDefaultOneOfManyJoinAlias(
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$this->guessRelationship()
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);
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$keyName = $this->query->getModel()->getKeyName();
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$columns = is_string($columns = $column) ? [
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$column => $aggregate,
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$keyName => $aggregate,
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] : $column;
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if (! array_key_exists($keyName, $columns)) {
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$columns[$keyName] = 'MAX';
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}
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if ($aggregate instanceof Closure) {
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$closure = $aggregate;
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}
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foreach ($columns as $column => $aggregate) {
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if (! in_array(strtolower($aggregate), ['min', 'max'])) {
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throw new InvalidArgumentException("Invalid aggregate [{$aggregate}] used within ofMany relation. Available aggregates: MIN, MAX");
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}
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$subQuery = $this->newOneOfManySubQuery(
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$this->getOneOfManySubQuerySelectColumns(),
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array_merge([$column], $previous['columns'] ?? []),
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$aggregate,
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);
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if (isset($previous)) {
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$this->addOneOfManyJoinSubQuery(
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$subQuery,
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$previous['subQuery'],
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$previous['columns'],
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);
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}
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if (isset($closure)) {
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$closure($subQuery);
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}
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if (! isset($previous)) {
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$this->oneOfManySubQuery = $subQuery;
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}
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if (array_key_last($columns) == $column) {
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$this->addOneOfManyJoinSubQuery(
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$this->query,
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$subQuery,
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array_merge([$column], $previous['columns'] ?? []),
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);
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}
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$previous = [
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'subQuery' => $subQuery,
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'columns' => array_merge([$column], $previous['columns'] ?? []),
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];
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}
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$this->addConstraints();
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$columns = $this->query->getQuery()->columns;
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if (is_null($columns) || $columns === ['*']) {
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$this->select([$this->qualifyColumn('*')]);
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}
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return $this;
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}
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/**
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* Indicate that the relation is the latest single result of a larger one-to-many relationship.
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*
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* @param string|array|null $column
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* @param string|null $relation
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* @return $this
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*/
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public function latestOfMany($column = 'id', $relation = null)
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{
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return $this->ofMany(collect(Arr::wrap($column))->mapWithKeys(function ($column) {
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return [$column => 'MAX'];
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})->all(), 'MAX', $relation);
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}
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/**
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* Indicate that the relation is the oldest single result of a larger one-to-many relationship.
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*
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* @param string|array|null $column
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* @param string|null $relation
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* @return $this
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*/
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public function oldestOfMany($column = 'id', $relation = null)
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{
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return $this->ofMany(collect(Arr::wrap($column))->mapWithKeys(function ($column) {
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return [$column => 'MIN'];
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})->all(), 'MIN', $relation);
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}
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/**
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* Get the default alias for the one of many inner join clause.
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*
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* @param string $relation
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* @return string
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*/
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protected function getDefaultOneOfManyJoinAlias($relation)
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{
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return $relation == $this->query->getModel()->getTable()
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? $relation.'_of_many'
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: $relation;
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}
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/**
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* Get a new query for the related model, grouping the query by the given column, often the foreign key of the relationship.
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*
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* @param string|array $groupBy
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* @param array<string>|null $columns
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* @param string|null $aggregate
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* @return \Illuminate\Database\Eloquent\Builder
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*/
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protected function newOneOfManySubQuery($groupBy, $columns = null, $aggregate = null)
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{
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$subQuery = $this->query->getModel()
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->newQuery()
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->withoutGlobalScopes($this->removedScopes());
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foreach (Arr::wrap($groupBy) as $group) {
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$subQuery->groupBy($this->qualifyRelatedColumn($group));
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}
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if (! is_null($columns)) {
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foreach ($columns as $key => $column) {
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$aggregatedColumn = $subQuery->getQuery()->grammar->wrap($subQuery->qualifyColumn($column));
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if ($key === 0) {
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$aggregatedColumn = "{$aggregate}({$aggregatedColumn})";
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} else {
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$aggregatedColumn = "min({$aggregatedColumn})";
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}
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$subQuery->selectRaw($aggregatedColumn.' as '.$subQuery->getQuery()->grammar->wrap($column.'_aggregate'));
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}
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}
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$this->addOneOfManySubQueryConstraints($subQuery, $groupBy, $columns, $aggregate);
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return $subQuery;
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}
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/**
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* Add the join subquery to the given query on the given column and the relationship's foreign key.
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*
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* @param \Illuminate\Database\Eloquent\Builder $parent
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* @param \Illuminate\Database\Eloquent\Builder $subQuery
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* @param array<string> $on
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* @return void
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*/
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protected function addOneOfManyJoinSubQuery(Builder $parent, Builder $subQuery, $on)
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{
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$parent->beforeQuery(function ($parent) use ($subQuery, $on) {
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$subQuery->applyBeforeQueryCallbacks();
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$parent->joinSub($subQuery, $this->relationName, function ($join) use ($on) {
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foreach ($on as $onColumn) {
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$join->on($this->qualifySubSelectColumn($onColumn.'_aggregate'), '=', $this->qualifyRelatedColumn($onColumn));
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}
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$this->addOneOfManyJoinSubQueryConstraints($join, $on);
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});
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});
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}
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/**
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* Merge the relationship query joins to the given query builder.
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*
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* @param \Illuminate\Database\Eloquent\Builder $query
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* @return void
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*/
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protected function mergeOneOfManyJoinsTo(Builder $query)
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{
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$query->getQuery()->beforeQueryCallbacks = $this->query->getQuery()->beforeQueryCallbacks;
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$query->applyBeforeQueryCallbacks();
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}
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/**
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* Get the query builder that will contain the relationship constraints.
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*
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* @return \Illuminate\Database\Eloquent\Builder
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*/
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protected function getRelationQuery()
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{
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return $this->isOneOfMany()
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? $this->oneOfManySubQuery
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: $this->query;
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}
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/**
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* Get the one of many inner join subselect builder instance.
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*
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* @return \Illuminate\Database\Eloquent\Builder|void
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*/
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public function getOneOfManySubQuery()
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{
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return $this->oneOfManySubQuery;
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}
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/**
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* Get the qualified column name for the one-of-many relationship using the subselect join query's alias.
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*
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* @param string $column
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* @return string
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*/
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public function qualifySubSelectColumn($column)
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{
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return $this->getRelationName().'.'.last(explode('.', $column));
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}
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/**
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* Qualify related column using the related table name if it is not already qualified.
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*
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* @param string $column
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* @return string
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*/
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protected function qualifyRelatedColumn($column)
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{
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return str_contains($column, '.') ? $column : $this->query->getModel()->getTable().'.'.$column;
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}
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/**
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* Guess the "hasOne" relationship's name via backtrace.
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*
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* @return string
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*/
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protected function guessRelationship()
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{
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return debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3)[2]['function'];
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}
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/**
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* Determine whether the relationship is a one-of-many relationship.
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*
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* @return bool
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*/
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public function isOneOfMany()
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{
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return $this->isOneOfMany;
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}
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/**
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* Get the name of the relationship.
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*
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* @return string
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*/
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public function getRelationName()
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{
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return $this->relationName;
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}
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}
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