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Giacomo Masseroni
Giacomo Masseroni

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PHPDocs for Laravel relationships

#php #laravel #programming #productivity

Context

The context: you have a Laravel 10/11/12 project, and you want to use PHPStan.

You use a PHPStan level 6 (or higher), because it's cool! (and you're right about that).

You execute the PHPStan command, and this is one of the error you get:

------ -----------------------------------------------------------------------------------------------------------------------------
  Line   Models\Base\Comment.php
 ------ -----------------------------------------------------------------------------------------------------------------------------
  82     Method App\Models\Base\Comment::commentable() return type with generic class Illuminate\Database\Eloquent\Relations\MorphTo
         does not specify its types: TRelatedModel, TDeclaringModel
         🪪  missingType.generics
 ------ -----------------------------------------------------------------------------------------------------------------------------
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What happened?
You have a model defined like this:

public function commentable(): MorphTo  
{  
    return $this->morphTo(__FUNCTION__, 'commentable_type', 'commentable_id');  
}
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Without PHPDoc, PHPStan is unable to check your code to verify if everything is correct.

How can you fix this?

Add this PHPDoc to the function:

/**  
 * @return MorphTo<Model, $this>  
 */
 public function commentable(): MorphTo  
 {  
     return $this->morphTo(__FUNCTION__, 'commentable_type', 'commentable_id');  
 }
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Following are all PHPDocs you need to add to Laravel relationships to pass PHPStan level > 6 check.

Laravel Relationships

HasOne 

/**  
 * @return HasOne<PostFollowingPost, $this>  
 */
public function postFollowingPostsAsFollowing(): HasOne
{  
    return $this->hasOne(PostFollowingPost::class, 'following_id', 'id');  
}
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BelongsTo 

/**  
 * @return BelongsTo<Post, $this>  
 */
public function post(): BelongsTo  
{  
    return $this->belongsTo(Post::class, 'id_post');  
}
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HasMany 

/**  
 * @return HasMany<PostFollowingPost, $this>  
 */
public function postFollowingPostsAsFollowing(): HasMany  
{  
    return $this->hasMany(PostFollowingPost::class, 'following_id', 'id');  
}
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HasOneThrough 

/**  
 * @return HasOneThrough<Post, Pivot, $this>
 */
public function posts(): HasOneThrough
{  
    return $this->hasOneThrough(Post::class, Pivot::class, 'post_id', 'id');  
}
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HasManyThrough 

/**  
 * @return HasManyThrough<Post, Pivot, $this> 
 */
public function posts(): HasManyThrough
{  
    return $this->hasManyThrough(Post::class, Pivot::class, 'post_id', 'id');  
}
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BelongsToMany 

/**  
 * @return BelongsToMany<Post, $this>
 */
public function posts(): BelongsToMany
{  
    return $this->belongsToMany(Post::class, 'post_id', 'id');  
}
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MorphTo 

/**  
 * @return MorphTo<Model, $this>  
 */
 public function commentable(): MorphTo  
 {  
     return $this->morphTo(__FUNCTION__, 'commentable_type', 'commentable_id');  
 }
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MorphOne 

/**  
 * @return MorphOne<Post, $this>  
 */
public function post(): MorphOne
{  
    return $this->morphOne(Post::class, 'postable');  
}
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MorphMany 

/**  
 * @return MorphMany<Post, $this>
 */
public function posts(): MorphMany
{  
    return $this->morphMany(Post::class, 'postable');  
}
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MorphToMany 

/**  
* @return MorphToMany<Post, $this>  
*/
public function posts(): MorphToMany
{  
    return $this->morphToMany(Post::class, 'name');  
}
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I developed a package to generate Laravel Models from an existing database.

The package generates code PHPStan level max compliant:

https://github.com/giacomomasseron/laravel-models-generator

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