<?php
namespace Illuminate\Database\Eloquent\Relations\Concerns;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Support\Collection as BaseCollection;
trait InteractsWithPivotTable
{
/**
* Toggles a model (or models) from the parent.
*
* Each existing model is detached, and non existing ones are attached.
*
* @param mixed $ids
* @param bool $touch
* @return array
*/
public function toggle($ids, $touch = true)
{
$changes = [
'attached' => [], 'detached' => [],
];
$records = $this->formatRecordsList($this->parseIds($ids));
// Next, we will determine which IDs should get removed from the join table by
// checking which of the given ID/records is in the list of current records
// and removing all of those rows from this "intermediate" joining table.
$detach = array_values(array_intersect(
$this->newPivotQuery()->pluck($this->relatedPivotKey)->all(),
array_keys($records)
));
if (count($detach) > 0) {
$this->detach($detach, false);
$changes['detached'] = $this->castKeys($detach);
}
// Finally, for all of the records which were not "detached", we'll attach the
// records into the intermediate table. Then, we will add those attaches to
// this change list and get ready to return these results to the callers.
$attach = array_diff_key($records, array_flip($detach));
if (count($attach) > 0) {
$this->attach($attach, [], false);
$changes['attached'] = array_keys($attach);
}
// Once we have finished attaching or detaching the records, we will see if we
// have done any attaching or detaching, and if we have we will touch these
// relationships if they are configured to touch on any database updates.
if ($touch && (count($changes['attached']) ||
count($changes['detached']))) {
$this->touchIfTouching();
}
return $changes;
}
/**
* Sync the intermediate tables with a list of IDs without detaching.
*
* @param \Illuminate\Database\Eloquent\Collection|\Illuminate\Support\Collection|array $ids
* @return array
*/
public function syncWithoutDetaching($ids)
{
return $this->sync($ids, false);
}
/**
* Sync the intermediate tables with a list of IDs or collection of models.
*
* @param \Illuminate\Database\Eloquent\Collection|\Illuminate\Support\Collection|array $ids
* @param bool $detaching
* @return array
*/
public function sync($ids, $detaching = true)
{
$changes = [
'attached' => [], 'detached' => [], 'updated' => [],
];
// First we need to attach any of the associated models that are not currently
// in this joining table. We'll spin through the given IDs, checking to see
// if they exist in the array of current ones, and if not we will insert.
$current = $this->newPivotQuery()->pluck(
$this->relatedPivotKey
)->all();
$detach = array_diff($current, array_keys(
$records = $this->formatRecordsList($this->parseIds($ids))
));
// Next, we will take the differences of the currents and given IDs and detach
// all of the entities that exist in the "current" array but are not in the
// array of the new IDs given to the method which will complete the sync.
if ($detaching && count($detach) > 0) {
$this->detach($detach);
$changes['detached'] = $this->castKeys($detach);
}
// Now we are finally ready to attach the new records. Note that we'll disable
// touching until after the entire operation is complete so we don't fire a
// ton of touch operations until we are totally done syncing the records.
$changes = array_merge(
$changes, $this->attachNew($records, $current, false)
);
// Once we have finished attaching or detaching the records, we will see if we
// have done any attaching or detaching, and if we have we will touch these
// relationships if they are configured to touch on any database updates.
if (count($changes['attached']) ||
count($changes['updated'])) {
$this->touchIfTouching();
}
return $changes;
}
/**
* Format the sync / toggle record list so that it is keyed by ID.
*
* @param array $records
* @return array
*/
protected function formatRecordsList(array $records)
{
return collect($records)->mapWithKeys(function ($attributes, $id) {
if (! is_array($attributes)) {
list($id, $attributes) = [$attributes, []];
}
return [$id => $attributes];
})->all();
}
/**
* Attach all of the records that aren't in the given current records.
*
* @param array $records
* @param array $current
* @param bool $touch
* @return array
*/
protected function attachNew(array $records, array $current, $touch = true)
{
$changes = ['attached' => [], 'updated' => []];
foreach ($records as $id => $attributes) {
// If the ID is not in the list of existing pivot IDs, we will insert a new pivot
// record, otherwise, we will just update this existing record on this joining
// table, so that the developers will easily update these records pain free.
if (! in_array($id, $current)) {
$this->attach($id, $attributes, $touch);
$changes['attached'][] = $this->castKey($id);
}
// Now we'll try to update an existing pivot record with the attributes that were
// given to the method. If the model is actually updated we will add it to the
// list of updated pivot records so we return them back out to the consumer.
elseif (count($attributes) > 0 &&
$this->updateExistingPivot($id, $attributes, $touch)) {
$changes['updated'][] = $this->castKey($id);
}
}
return $changes;
}
/**
* Update an existing pivot record on the table.
*
* @param mixed $id
* @param array $attributes
* @param bool $touch
* @return int
*/
public function updateExistingPivot($id, array $attributes, $touch = true)
{
if (in_array($this->updatedAt(), $this->pivotColumns)) {
$attributes = $this->addTimestampsToAttachment($attributes, true);
}
$updated = $this->newPivotStatementForId($this->parseId($id))->update(
$this->castAttributes($attributes)
);
if ($touch) {
$this->touchIfTouching();
}
return $updated;
}
/**
* Attach a model to the parent.
*
* @param mixed $id
* @param array $attributes
* @param bool $touch
* @return void
*/
public function attach($id, array $attributes = [], $touch = true)
{
// Here we will insert the attachment records into the pivot table. Once we have
// inserted the records, we will touch the relationships if necessary and the
// function will return. We can parse the IDs before inserting the records.
$this->newPivotStatement()->insert($this->formatAttachRecords(
$this->parseIds($id), $attributes
));
if ($touch) {
$this->touchIfTouching();
}
}
/**
* Create an array of records to insert into the pivot table.
*
* @param array $ids
* @param array $attributes
* @return array
*/
protected function formatAttachRecords($ids, array $attributes)
{
$records = [];
$hasTimestamps = ($this->hasPivotColumn($this->createdAt()) ||
$this->hasPivotColumn($this->updatedAt()));
// To create the attachment records, we will simply spin through the IDs given
// and create a new record to insert for each ID. Each ID may actually be a
// key in the array, with extra attributes to be placed in other columns.
foreach ($ids as $key => $value) {
$records[] = $this->formatAttachRecord(
$key, $value, $attributes, $hasTimestamps
);
}
return $records;
}
/**
* Create a full attachment record payload.
*
* @param int $key
* @param mixed $value
* @param array $attributes
* @param bool $hasTimestamps
* @return array
*/
protected function formatAttachRecord($key, $value, $attributes, $hasTimestamps)
{
list($id, $attributes) = $this->extractAttachIdAndAttributes($key, $value, $attributes);
return array_merge(
$this->baseAttachRecord($id, $hasTimestamps), $this->castAttributes($attributes)
);
}
/**
* Get the attach record ID and extra attributes.
*
* @param mixed $key
* @param mixed $value
* @param array $attributes
* @return array
*/
protected function extractAttachIdAndAttributes($key, $value, array $attributes)
{
return is_array($value)
? [$key, array_merge($value, $attributes)]
: [$value, $attributes];
}
/**
* Create a new pivot attachment record.
*
* @param int $id
* @param bool $timed
* @return array
*/
protected function baseAttachRecord($id, $timed)
{
$record[$this->relatedPivotKey] = $id;
$record[$this->foreignPivotKey] = $this->parent->{$this->parentKey};
// If the record needs to have creation and update timestamps, we will make
// them by calling the parent model's "freshTimestamp" method which will
// provide us with a fresh timestamp in this model's preferred format.
if ($timed) {
$record = $this->addTimestampsToAttachment($record);
}
foreach ($this->pivotValues as $value) {
$record[$value['column']] = $value['value'];
}
return $record;
}
/**
* Set the creation and update timestamps on an attach record.
*
* @param array $record
* @param bool $exists
* @return array
*/
protected function addTimestampsToAttachment(array $record, $exists = false)
{
$fresh = $this->parent->freshTimestamp();
if ($this->using) {
$pivotModel = new $this->using;
$fresh = $fresh->format($pivotModel->getDateFormat());
}
if (! $exists && $this->hasPivotColumn($this->createdAt())) {
$record[$this->createdAt()] = $fresh;
}
if ($this->hasPivotColumn($this->updatedAt())) {
$record[$this->updatedAt()] = $fresh;
}
return $record;
}
/**
* Determine whether the given column is defined as a pivot column.
*
* @param string $column
* @return bool
*/
protected function hasPivotColumn($column)
{
return in_array($column, $this->pivotColumns);
}
/**
* Detach models from the relationship.
*
* @param mixed $ids
* @param bool $touch
* @return int
*/
public function detach($ids = null, $touch = true)
{
$query = $this->newPivotQuery();
// If associated IDs were passed to the method we will only delete those
// associations, otherwise all of the association ties will be broken.
// We'll return the numbers of affected rows when we do the deletes.
if (! is_null($ids)) {
$ids = $this->parseIds($ids);
if (empty($ids)) {
return 0;
}
$query->whereIn($this->relatedPivotKey, (array) $ids);
}
// Once we have all of the conditions set on the statement, we are ready
// to run the delete on the pivot table. Then, if the touch parameter
// is true, we will go ahead and touch all related models to sync.
$results = $query->delete();
if ($touch) {
$this->touchIfTouching();
}
return $results;
}
/**
* Create a new pivot model instance.
*
* @param array $attributes
* @param bool $exists
* @return \Illuminate\Database\Eloquent\Relations\Pivot
*/
public function newPivot(array $attributes = [], $exists = false)
{
$pivot = $this->related->newPivot(
$this->parent, $attributes, $this->table, $exists, $this->using
);
return $pivot->setPivotKeys($this->foreignPivotKey, $this->relatedPivotKey);
}
/**
* Create a new existing pivot model instance.
*
* @param array $attributes
* @return \Illuminate\Database\Eloquent\Relations\Pivot
*/
public function newExistingPivot(array $attributes = [])
{
return $this->newPivot($attributes, true);
}
/**
* Get a new plain query builder for the pivot table.
*
* @return \Illuminate\Database\Query\Builder
*/
public function newPivotStatement()
{
return $this->query->getQuery()->newQuery()->from($this->table);
}
/**
* Get a new pivot statement for a given "other" ID.
*
* @param mixed $id
* @return \Illuminate\Database\Query\Builder
*/
public function newPivotStatementForId($id)
{
return $this->newPivotQuery()->where($this->relatedPivotKey, $id);
}
/**
* Create a new query builder for the pivot table.
*
* @return \Illuminate\Database\Query\Builder
*/
protected function newPivotQuery()
{
$query = $this->newPivotStatement();
foreach ($this->pivotWheres as $arguments) {
call_user_func_array([$query, 'where'], $arguments);
}
foreach ($this->pivotWhereIns as $arguments) {
call_user_func_array([$query, 'whereIn'], $arguments);
}
return $query->where($this->foreignPivotKey, $this->parent->{$this->parentKey});
}
/**
* Set the columns on the pivot table to retrieve.
*
* @param array|mixed $columns
* @return $this
*/
public function withPivot($columns)
{
$this->pivotColumns = array_merge(
$this->pivotColumns, is_array($columns) ? $columns : func_get_args()
);
return $this;
}
/**
* Get all of the IDs from the given mixed value.
*
* @param mixed $value
* @return array
*/
protected function parseIds($value)
{
if ($value instanceof Model) {
return [$value->getKey()];
}
if ($value instanceof Collection) {
return $value->modelKeys();
}
if ($value instanceof BaseCollection) {
return $value->toArray();
}
return (array) $value;
}
/**
* Get the ID from the given mixed value.
*
* @param mixed $value
* @return mixed
*/
protected function parseId($value)
{
return $value instanceof Model ? $value->getKey() : $value;
}
/**
* Cast the given keys to integers if they are numeric and string otherwise.
*
* @param array $keys
* @return array
*/
protected function castKeys(array $keys)
{
return (array) array_map(function ($v) {
return $this->castKey($v);
}, $keys);
}
/**
* Cast the given key to an integer if it is numeric.
*
* @param mixed $key
* @return mixed
*/
protected function castKey($key)
{
return is_numeric($key) ? (int) $key : (string) $key;
}
/**
* Cast the given pivot attributes.
*
* @param array $attributes
* @return array
*/
protected function castAttributes($attributes)
{
return $this->using
? $this->newPivot()->fill($attributes)->getAttributes()
: $attributes;
}
}