64 lines
1.5 KiB
PHP
64 lines
1.5 KiB
PHP
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<?php
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namespace Illuminate\Database\Eloquent\Relations\Concerns;
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use Illuminate\Database\Eloquent\Model;
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trait SupportsDefaultModels
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{
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/**
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* Indicates if a default model instance should be used.
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*
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* Alternatively, may be a Closure or array.
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*
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* @var \Closure|array|bool
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*/
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protected $withDefault;
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/**
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* Make a new related instance for the given model.
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*
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* @param \Illuminate\Database\Eloquent\Model $parent
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* @return \Illuminate\Database\Eloquent\Model
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*/
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abstract protected function newRelatedInstanceFor(Model $parent);
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/**
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* Return a new model instance in case the relationship does not exist.
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*
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* @param \Closure|array|bool $callback
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* @return $this
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*/
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public function withDefault($callback = true)
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{
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$this->withDefault = $callback;
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return $this;
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}
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/**
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* Get the default value for this relation.
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*
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* @param \Illuminate\Database\Eloquent\Model $parent
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* @return \Illuminate\Database\Eloquent\Model|null
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*/
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protected function getDefaultFor(Model $parent)
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{
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if (! $this->withDefault) {
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return;
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}
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$instance = $this->newRelatedInstanceFor($parent);
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if (is_callable($this->withDefault)) {
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return call_user_func($this->withDefault, $instance, $parent) ?: $instance;
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}
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if (is_array($this->withDefault)) {
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$instance->forceFill($this->withDefault);
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}
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return $instance;
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}
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}
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