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CanBeOneOfMany.php
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CanBeOneOfMany.php
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<?php
namespace Illuminate\Database\Eloquent\Relations\Concerns;
use Closure;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Support\Str;
trait CanBeOneOfMany
{
/**
* Determines wether the relationship is one-of-many.
*
* @var bool
*/
protected $isOneOfMany = false;
/**
* The name of the relationship.
*
* @var string
*/
protected $relationName;
/**
* Wether the relation is a partial of a one-to-many relationship.
*
* @param string|array|null $column
* @param string|Closure|null $aggregate
* @param string|null $relation
* @return $this
*/
public function ofMany($column = 'id', $aggregate = 'MAX', $relation = null)
{
$this->isOneOfMany = true;
if (is_null($this->relationName = $relation)) {
$this->relationName = $this->guessRelationship();
}
$keyName = $this->query->getModel()->getKeyName();
if (is_string($columns = $column)) {
$columns = [
$column => $aggregate,
$keyName => $aggregate,
];
}
if ($aggregate instanceof Closure) {
$closure = $aggregate;
}
foreach ($columns as $column => $aggregate) {
$groupBy = isset($previous) ? $previous['column'] : $this->foreignKey;
$sub = $this->newSubQuery($groupBy, $column, $aggregate);
if (isset($previous)) {
$this->addJoinSub($sub, $previous['sub'], $previous['column']);
} elseif (isset($closure)) {
$closure($sub);
}
if (array_key_last($columns) == $column) {
$this->addJoinSub($this->query, $sub, $column);
}
$previous = [
'sub' => $sub,
'column' => $column,
];
}
return $this;
}
/**
* Get new grouped sub query for inner join clause.
*
* @param string $groupBy
* @param string|null $column
* @param string|null $aggregate
* @return void
*/
protected function newSubQuery($groupBy, $column = null, $aggregate = null)
{
$sub = $this->query->getModel()
->newQuery()
->groupBy($this->qualifyRelatedColumn($groupBy));
if (! is_null($column)) {
$sub->selectRaw($aggregate.'('.$column.') as '.$column.','.$this->foreignKey);
}
return $sub;
}
/**
* Add join sub.
*
* @param Builder $parent
* @param Builder $sub
* @param string $on
* @return void
*/
protected function addJoinSub(Builder $parent, Builder $sub, $on)
{
$parent->joinSub($sub, $this->relationName, function ($join) use ($on) {
$join
->on($this->qualifySubSelectColumn($on), '=', $this->qualifyRelatedColumn($on))
->on($this->qualifySubSelectColumn($this->foreignKey), '=', $this->qualifyRelatedColumn($this->foreignKey));
});
}
/**
* Guess the "hasOne" relationship name.
*
* @return string
*/
protected function guessRelationship()
{
[$one, $two, $caller] = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3);
return $caller['function'];
}
/**
* Get the name of the relationship.
*
* @return string
*/
public function getRelationName()
{
return $this->relationName;
}
/**
* Get related key name.
*
* @return string
*/
protected function getRelatedKeyName()
{
return $this->getRelatedTableName().'.'.$this->query->getModel()->getKeyName();
}
/**
* Get sub select alias.
*
* @return string
*/
public function getSubSelectAlias()
{
return $this->getRelationName()."_{$this->localKey}";
}
/**
* Determines wether the relationship is one-of-many.
*
* @return bool
*/
public function isOneOfMany()
{
return $this->isOneOfMany;
}
/**
* Get the subselect table alias.
*
* @return string
*/
public function getSubSelectTableAlias()
{
return $this->getRelationName();
}
/**
* Qualify related column.
*
* @param string $column
* @return string
*/
protected function qualifyRelatedColumn($column)
{
return Str::contains($column, '.') ? $column : $this->getRelatedTableName().'.'.$column;
}
/**
* Get the qualified column name for the one-of-many subselect.
*
* @param string $column
* @return string
*/
public function qualifySubSelectColumn($column)
{
$segments = explode('.', $column);
return $this->getSubSelectTableAlias().'.'.end($segments);
}
/**
* Get the related table name.
*
* @return string
*/
protected function getRelatedTableName()
{
return $this->query->getModel()->getTable();
}
/**
* Get the result query builder instance for the given query builder.
*
* @return \Illuminate\Database\Eloquent\Builder
*/
protected function newOneOfManyQuery()
{
return $this->query->getModel()->newQuery();
}
}