<?php
namespace Illuminate\Database\Eloquent\Concerns;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Database\Eloquent\Relations\HasOne;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\Relations\MorphTo;
use Illuminate\Database\Eloquent\Relations\MorphOne;
use Illuminate\Database\Eloquent\Relations\Relation;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\MorphMany;
use Illuminate\Database\Eloquent\Relations\MorphToMany;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\Relations\HasManyThrough;
trait HasRelationships
{
/**
* The loaded relationships for the model.
*
* @var array
*/
protected $relations = [];
/**
* The relationships that should be touched on save.
*
* @var array
*/
protected $touches = [];
/**
* The many to many relationship methods.
*
* @var array
*/
public static $manyMethods = [
'belongsToMany', 'morphToMany', 'morphedByMany',
'guessBelongsToManyRelation', 'findFirstMethodThatIsntRelation',
];
/**
* Define a one-to-one relationship.
*
* @param string $related
* @param string $foreignKey
* @param string $localKey
* @return \Illuminate\Database\Eloquent\Relations\HasOne
*/
public function hasOne($related, $foreignKey = null, $localKey = null)
{
$instance = $this->newRelatedInstance($related);
$foreignKey = $foreignKey ?: $this->getForeignKey();
$localKey = $localKey ?: $this->getKeyName();
return $this->newHasOne($instance->newQuery(), $this, $instance->getTable().'.'.$foreignKey, $localKey);
}
/**
* Instantiate a new HasOne relationship.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Model $parent
* @param string $foreignKey
* @param string $localKey
* @return \Illuminate\Database\Eloquent\Relations\HasOne
*/
protected function newHasOne(Builder $query, Model $parent, $foreignKey, $localKey)
{
return new HasOne($query, $parent, $foreignKey, $localKey);
}
/**
* Define a polymorphic one-to-one relationship.
*
* @param string $related
* @param string $name
* @param string $type
* @param string $id
* @param string $localKey
* @return \Illuminate\Database\Eloquent\Relations\MorphOne
*/
public function morphOne($related, $name, $type = null, $id = null, $localKey = null)
{
$instance = $this->newRelatedInstance($related);
list($type, $id) = $this->getMorphs($name, $type, $id);
$table = $instance->getTable();
$localKey = $localKey ?: $this->getKeyName();
return $this->newMorphOne($instance->newQuery(), $this, $table.'.'.$type, $table.'.'.$id, $localKey);
}
/**
* Instantiate a new MorphOne relationship.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Model $parent
* @param string $type
* @param string $id
* @param string $localKey
* @return \Illuminate\Database\Eloquent\Relations\MorphOne
*/
protected function newMorphOne(Builder $query, Model $parent, $type, $id, $localKey)
{
return new MorphOne($query, $parent, $type, $id, $localKey);
}
/**
* Define an inverse one-to-one or many relationship.
*
* @param string $related
* @param string $foreignKey
* @param string $ownerKey
* @param string $relation
* @return \Illuminate\Database\Eloquent\Relations\BelongsTo
*/
public function belongsTo($related, $foreignKey = null, $ownerKey = null, $relation = null)
{
// If no relation name was given, we will use this debug backtrace to extract
// the calling method's name and use that as the relationship name as most
// of the time this will be what we desire to use for the relationships.
if (is_null($relation)) {
$relation = $this->guessBelongsToRelation();
}
$instance = $this->newRelatedInstance($related);
// If no foreign key was supplied, we can use a backtrace to guess the proper
// foreign key name by using the name of the relationship function, which
// when combined with an "_id" should conventionally match the columns.
if (is_null($foreignKey)) {
$foreignKey = Str::snake($relation).'_'.$instance->getKeyName();
}
// Once we have the foreign key names, we'll just create a new Eloquent query
// for the related models and returns the relationship instance which will
// actually be responsible for retrieving and hydrating every relations.
$ownerKey = $ownerKey ?: $instance->getKeyName();
return $this->newBelongsTo(
$instance->newQuery(), $this, $foreignKey, $ownerKey, $relation
);
}
/**
* Instantiate a new BelongsTo relationship.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Model $child
* @param string $foreignKey
* @param string $ownerKey
* @param string $relation
* @return \Illuminate\Database\Eloquent\Relations\BelongsTo
*/
protected function newBelongsTo(Builder $query, Model $child, $foreignKey, $ownerKey, $relation)
{
return new BelongsTo($query, $child, $foreignKey, $ownerKey, $relation);
}
/**
* Define a polymorphic, inverse one-to-one or many relationship.
*
* @param string $name
* @param string $type
* @param string $id
* @param string $ownerKey
* @return \Illuminate\Database\Eloquent\Relations\MorphTo
*/
public function morphTo($name = null, $type = null, $id = null, $ownerKey = null)
{
// If no name is provided, we will use the backtrace to get the function name
// since that is most likely the name of the polymorphic interface. We can
// use that to get both the class and foreign key that will be utilized.
$name = $name ?: $this->guessBelongsToRelation();
list($type, $id) = $this->getMorphs(
Str::snake($name), $type, $id
);
// If the type value is null it is probably safe to assume we're eager loading
// the relationship. In this case we'll just pass in a dummy query where we
// need to remove any eager loads that may already be defined on a model.
return empty($class = $this->{$type})
? $this->morphEagerTo($name, $type, $id, $ownerKey)
: $this->morphInstanceTo($class, $name, $type, $id, $ownerKey);
}
/**
* Define a polymorphic, inverse one-to-one or many relationship.
*
* @param string $name
* @param string $type
* @param string $id
* @param string $ownerKey
* @return \Illuminate\Database\Eloquent\Relations\MorphTo
*/
protected function morphEagerTo($name, $type, $id, $ownerKey)
{
return $this->newMorphTo(
$this->newQuery()->setEagerLoads([]), $this, $id, $ownerKey, $type, $name
);
}
/**
* Define a polymorphic, inverse one-to-one or many relationship.
*
* @param string $target
* @param string $name
* @param string $type
* @param string $id
* @param string $ownerKey
* @return \Illuminate\Database\Eloquent\Relations\MorphTo
*/
protected function morphInstanceTo($target, $name, $type, $id, $ownerKey)
{
$instance = $this->newRelatedInstance(
static::getActualClassNameForMorph($target)
);
return $this->newMorphTo(
$instance->newQuery(), $this, $id, $ownerKey ?? $instance->getKeyName(), $type, $name
);
}
/**
* Instantiate a new MorphTo relationship.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Model $parent
* @param string $foreignKey
* @param string $ownerKey
* @param string $type
* @param string $relation
* @return \Illuminate\Database\Eloquent\Relations\MorphTo
*/
protected function newMorphTo(Builder $query, Model $parent, $foreignKey, $ownerKey, $type, $relation)
{
return new MorphTo($query, $parent, $foreignKey, $ownerKey, $type, $relation);
}
/**
* Retrieve the actual class name for a given morph class.
*
* @param string $class
* @return string
*/
public static function getActualClassNameForMorph($class)
{
return Arr::get(Relation::morphMap() ?: [], $class, $class);
}
/**
* Guess the "belongs to" relationship name.
*
* @return string
*/
protected function guessBelongsToRelation()
{
list($one, $two, $caller) = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3);
return $caller['function'];
}
/**
* Define a one-to-many relationship.
*
* @param string $related
* @param string $foreignKey
* @param string $localKey
* @return \Illuminate\Database\Eloquent\Relations\HasMany
*/
public function hasMany($related, $foreignKey = null, $localKey = null)
{
$instance = $this->newRelatedInstance($related);
$foreignKey = $foreignKey ?: $this->getForeignKey();
$localKey = $localKey ?: $this->getKeyName();
return $this->newHasMany(
$instance->newQuery(), $this, $instance->getTable().'.'.$foreignKey, $localKey
);
}
/**
* Instantiate a new HasMany relationship.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Model $parent
* @param string $foreignKey
* @param string $localKey
* @return \Illuminate\Database\Eloquent\Relations\HasMany
*/
protected function newHasMany(Builder $query, Model $parent, $foreignKey, $localKey)
{
return new HasMany($query, $parent, $foreignKey, $localKey);
}
/**
* Define a has-many-through relationship.
*
* @param string $related
* @param string $through
* @param string|null $firstKey
* @param string|null $secondKey
* @param string|null $localKey
* @param string|null $secondLocalKey
* @return \Illuminate\Database\Eloquent\Relations\HasManyThrough
*/
public function hasManyThrough($related, $through, $firstKey = null, $secondKey = null, $localKey = null, $secondLocalKey = null)
{
$through = new $through;
$firstKey = $firstKey ?: $this->getForeignKey();
$secondKey = $secondKey ?: $through->getForeignKey();
return $this->newHasManyThrough(
$this->newRelatedInstance($related)->newQuery(), $this, $through,
$firstKey, $secondKey, $localKey ?: $this->getKeyName(),
$secondLocalKey ?: $through->getKeyName()
);
}
/**
* Instantiate a new HasManyThrough relationship.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Model $farParent
* @param \Illuminate\Database\Eloquent\Model $throughParent
* @param string $firstKey
* @param string $secondKey
* @param string $localKey
* @param string $secondLocalKey
* @return \Illuminate\Database\Eloquent\Relations\HasManyThrough
*/
protected function newHasManyThrough(Builder $query, Model $farParent, Model $throughParent, $firstKey, $secondKey, $localKey, $secondLocalKey)
{
return new HasManyThrough($query, $farParent, $throughParent, $firstKey, $secondKey, $localKey, $secondLocalKey);
}
/**
* Define a polymorphic one-to-many relationship.
*
* @param string $related
* @param string $name
* @param string $type
* @param string $id
* @param string $localKey
* @return \Illuminate\Database\Eloquent\Relations\MorphMany
*/
public function morphMany($related, $name, $type = null, $id = null, $localKey = null)
{
$instance = $this->newRelatedInstance($related);
// Here we will gather up the morph type and ID for the relationship so that we
// can properly query the intermediate table of a relation. Finally, we will
// get the table and create the relationship instances for the developers.
list($type, $id) = $this->getMorphs($name, $type, $id);
$table = $instance->getTable();
$localKey = $localKey ?: $this->getKeyName();
return $this->newMorphMany($instance->newQuery(), $this, $table.'.'.$type, $table.'.'.$id, $localKey);
}
/**
* Instantiate a new MorphMany relationship.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Model $parent
* @param string $type
* @param string $id
* @param string $localKey
* @return \Illuminate\Database\Eloquent\Relations\MorphMany
*/
protected function newMorphMany(Builder $query, Model $parent, $type, $id, $localKey)
{
return new MorphMany($query, $parent, $type, $id, $localKey);
}
/**
* Define a many-to-many relationship.
*
* @param string $related
* @param string $table
* @param string $foreignPivotKey
* @param string $relatedPivotKey
* @param string $parentKey
* @param string $relatedKey
* @param string $relation
* @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
*/
public function belongsToMany($related, $table = null, $foreignPivotKey = null, $relatedPivotKey = null,
$parentKey = null, $relatedKey = null, $relation = null)
{
// If no relationship name was passed, we will pull backtraces to get the
// name of the calling function. We will use that function name as the
// title of this relation since that is a great convention to apply.
if (is_null($relation)) {
$relation = $this->guessBelongsToManyRelation();
}
// First, we'll need to determine the foreign key and "other key" for the
// relationship. Once we have determined the keys we'll make the query
// instances as well as the relationship instances we need for this.
$instance = $this->newRelatedInstance($related);
$foreignPivotKey = $foreignPivotKey ?: $this->getForeignKey();
$relatedPivotKey = $relatedPivotKey ?: $instance->getForeignKey();
// If no table name was provided, we can guess it by concatenating the two
// models using underscores in alphabetical order. The two model names
// are transformed to snake case from their default CamelCase also.
if (is_null($table)) {
$table = $this->joiningTable($related);
}
return $this->newBelongsToMany(
$instance->newQuery(), $this, $table, $foreignPivotKey,
$relatedPivotKey, $parentKey ?: $this->getKeyName(),
$relatedKey ?: $instance->getKeyName(), $relation
);
}
/**
* Instantiate a new BelongsToMany relationship.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Model $parent
* @param string $table
* @param string $foreignPivotKey
* @param string $relatedPivotKey
* @param string $parentKey
* @param string $relatedKey
* @param string $relationName
* @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
*/
protected function newBelongsToMany(Builder $query, Model $parent, $table, $foreignPivotKey, $relatedPivotKey,
$parentKey, $relatedKey, $relationName = null)
{
return new BelongsToMany($query, $parent, $table, $foreignPivotKey, $relatedPivotKey, $parentKey, $relatedKey, $relationName);
}
/**
* Define a polymorphic many-to-many relationship.
*
* @param string $related
* @param string $name
* @param string $table
* @param string $foreignPivotKey
* @param string $relatedPivotKey
* @param string $parentKey
* @param string $relatedKey
* @param bool $inverse
* @return \Illuminate\Database\Eloquent\Relations\MorphToMany
*/
public function morphToMany($related, $name, $table = null, $foreignPivotKey = null,
$relatedPivotKey = null, $parentKey = null,
$relatedKey = null, $inverse = false)
{
$caller = $this->guessBelongsToManyRelation();
// First, we will need to determine the foreign key and "other key" for the
// relationship. Once we have determined the keys we will make the query
// instances, as well as the relationship instances we need for these.
$instance = $this->newRelatedInstance($related);
$foreignPivotKey = $foreignPivotKey ?: $name.'_id';
$relatedPivotKey = $relatedPivotKey ?: $instance->getForeignKey();
// Now we're ready to create a new query builder for this related model and
// the relationship instances for this relation. This relations will set
// appropriate query constraints then entirely manages the hydrations.
$table = $table ?: Str::plural($name);
return $this->newMorphToMany(
$instance->newQuery(), $this, $name, $table,
$foreignPivotKey, $relatedPivotKey, $parentKey ?: $this->getKeyName(),
$relatedKey ?: $instance->getKeyName(), $caller, $inverse
);
}
/**
* Instantiate a new MorphToMany relationship.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Model $parent
* @param string $name
* @param string $table
* @param string $foreignPivotKey
* @param string $relatedPivotKey
* @param string $parentKey
* @param string $relatedKey
* @param string $relationName
* @param bool $inverse
* @return \Illuminate\Database\Eloquent\Relations\MorphToMany
*/
protected function newMorphToMany(Builder $query, Model $parent, $name, $table, $foreignPivotKey,
$relatedPivotKey, $parentKey, $relatedKey,
$relationName = null, $inverse = false)
{
return new MorphToMany($query, $parent, $name, $table, $foreignPivotKey, $relatedPivotKey, $parentKey, $relatedKey,
$relationName, $inverse);
}
/**
* Define a polymorphic, inverse many-to-many relationship.
*
* @param string $related
* @param string $name
* @param string $table
* @param string $foreignPivotKey
* @param string $relatedPivotKey
* @param string $parentKey
* @param string $relatedKey
* @return \Illuminate\Database\Eloquent\Relations\MorphToMany
*/
public function morphedByMany($related, $name, $table = null, $foreignPivotKey = null,
$relatedPivotKey = null, $parentKey = null, $relatedKey = null)
{
$foreignPivotKey = $foreignPivotKey ?: $this->getForeignKey();
// For the inverse of the polymorphic many-to-many relations, we will change
// the way we determine the foreign and other keys, as it is the opposite
// of the morph-to-many method since we're figuring out these inverses.
$relatedPivotKey = $relatedPivotKey ?: $name.'_id';
return $this->morphToMany(
$related, $name, $table, $foreignPivotKey,
$relatedPivotKey, $parentKey, $relatedKey, true
);
}
/**
* Get the relationship name of the belongs to many.
*
* @return string
*/
protected function guessBelongsToManyRelation()
{
$caller = Arr::first(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS), function ($trace) {
return ! in_array($trace['function'], Model::$manyMethods);
});
return ! is_null($caller) ? $caller['function'] : null;
}
/**
* Get the joining table name for a many-to-many relation.
*
* @param string $related
* @return string
*/
public function joiningTable($related)
{
// The joining table name, by convention, is simply the snake cased models
// sorted alphabetically and concatenated with an underscore, so we can
// just sort the models and join them together to get the table name.
$models = [
Str::snake(class_basename($related)),
Str::snake(class_basename($this)),
];
// Now that we have the model names in an array we can just sort them and
// use the implode function to join them together with an underscores,
// which is typically used by convention within the database system.
sort($models);
return strtolower(implode('_', $models));
}
/**
* Determine if the model touches a given relation.
*
* @param string $relation
* @return bool
*/
public function touches($relation)
{
return in_array($relation, $this->touches);
}
/**
* Touch the owning relations of the model.
*
* @return void
*/
public function touchOwners()
{
foreach ($this->touches as $relation) {
$this->$relation()->touch();
if ($this->$relation instanceof self) {
$this->$relation->fireModelEvent('saved', false);
$this->$relation->touchOwners();
} elseif ($this->$relation instanceof Collection) {
$this->$relation->each(function (Model $relation) {
$relation->touchOwners();
});
}
}
}
/**
* Get the polymorphic relationship columns.
*
* @param string $name
* @param string $type
* @param string $id
* @return array
*/
protected function getMorphs($name, $type, $id)
{
return [$type ?: $name.'_type', $id ?: $name.'_id'];
}
/**
* Get the class name for polymorphic relations.
*
* @return string
*/
public function getMorphClass()
{
$morphMap = Relation::morphMap();
if (! empty($morphMap) && in_array(static::class, $morphMap)) {
return array_search(static::class, $morphMap, true);
}
return static::class;
}
/**
* Create a new model instance for a related model.
*
* @param string $class
* @return mixed
*/
protected function newRelatedInstance($class)
{
return tap(new $class, function ($instance) {
if (! $instance->getConnectionName()) {
$instance->setConnection($this->connection);
}
});
}
/**
* Get all the loaded relations for the instance.
*
* @return array
*/
public function getRelations()
{
return $this->relations;
}
/**
* Get a specified relationship.
*
* @param string $relation
* @return mixed
*/
public function getRelation($relation)
{
return $this->relations[$relation];
}
/**
* Determine if the given relation is loaded.
*
* @param string $key
* @return bool
*/
public function relationLoaded($key)
{
return array_key_exists($key, $this->relations);
}
/**
* Set the given relationship on the model.
*
* @param string $relation
* @param mixed $value
* @return $this
*/
public function setRelation($relation, $value)
{
$this->relations[$relation] = $value;
return $this;
}
/**
* Unset a loaded relationship.
*
* @param string $relation
* @return $this
*/
public function unsetRelation($relation)
{
unset($this->relations[$relation]);
return $this;
}
/**
* Set the entire relations array on the model.
*
* @param array $relations
* @return $this
*/
public function setRelations(array $relations)
{
$this->relations = $relations;
return $this;
}
/**
* Get the relationships that are touched on save.
*
* @return array
*/
public function getTouchedRelations()
{
return $this->touches;
}
/**
* Set the relationships that are touched on save.
*
* @param array $touches
* @return $this
*/
public function setTouchedRelations(array $touches)
{
$this->touches = $touches;
return $this;
}
}