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    <h3>Editing: MorphOneOrMany.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

namespace Illuminate\Database\Eloquent\Relations;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;

abstract class MorphOneOrMany extends HasOneOrMany
{
    /**
     * The foreign key type for the relationship.
     *
     * @var string
     */
    protected $morphType;

    /**
     * The class name of the parent model.
     *
     * @var string
     */
    protected $morphClass;

    /**
     * Create a new morph one or many relationship instance.
     *
     * @param  \Illuminate\Database\Eloquent\Builder  $query
     * @param  \Illuminate\Database\Eloquent\Model  $parent
     * @param  string  $type
     * @param  string  $id
     * @param  string  $localKey
     * @return void
     */
    public function __construct(Builder $query, Model $parent, $type, $id, $localKey)
    {
        $this-&gt;morphType = $type;

        $this-&gt;morphClass = $parent-&gt;getMorphClass();

        parent::__construct($query, $parent, $id, $localKey);
    }

    /**
     * Set the base constraints on the relation query.
     *
     * @return void
     */
    public function addConstraints()
    {
        if (static::$constraints) {
            $this-&gt;getRelationQuery()-&gt;where($this-&gt;morphType, $this-&gt;morphClass);

            parent::addConstraints();
        }
    }

    /**
     * Set the constraints for an eager load of the relation.
     *
     * @param  array  $models
     * @return void
     */
    public function addEagerConstraints(array $models)
    {
        parent::addEagerConstraints($models);

        $this-&gt;getRelationQuery()-&gt;where($this-&gt;morphType, $this-&gt;morphClass);
    }

    /**
     * Set the foreign ID and type for creating a related model.
     *
     * @param  \Illuminate\Database\Eloquent\Model  $model
     * @return void
     */
    protected function setForeignAttributesForCreate(Model $model)
    {
        $model-&gt;{$this-&gt;getForeignKeyName()} = $this-&gt;getParentKey();

        $model-&gt;{$this-&gt;getMorphType()} = $this-&gt;morphClass;
    }

    /**
     * Get the relationship query.
     *
     * @param  \Illuminate\Database\Eloquent\Builder  $query
     * @param  \Illuminate\Database\Eloquent\Builder  $parentQuery
     * @param  array|mixed  $columns
     * @return \Illuminate\Database\Eloquent\Builder
     */
    public function getRelationExistenceQuery(Builder $query, Builder $parentQuery, $columns = ['*'])
    {
        return parent::getRelationExistenceQuery($query, $parentQuery, $columns)-&gt;where(
            $query-&gt;qualifyColumn($this-&gt;getMorphType()), $this-&gt;morphClass
        );
    }

    /**
     * Get the foreign key &quot;type&quot; name.
     *
     * @return string
     */
    public function getQualifiedMorphType()
    {
        return $this-&gt;morphType;
    }

    /**
     * Get the plain morph type name without the table.
     *
     * @return string
     */
    public function getMorphType()
    {
        return last(explode('.', $this-&gt;morphType));
    }

    /**
     * Get the class name of the parent model.
     *
     * @return string
     */
    public function getMorphClass()
    {
        return $this-&gt;morphClass;
    }
}
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