Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like Song often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Song, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 29 | class Song extends Model |
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| 30 | { |
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| 31 | use SupportsDeleteWhereIDsNotIn; |
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| 32 | |||
| 33 | protected $guarded = []; |
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| 34 | |||
| 35 | /** |
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| 36 | * Attributes to be hidden from JSON outputs. |
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| 37 | * Here we specify to hide lyrics as well to save some bandwidth (actually, lots of it). |
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| 38 | * Lyrics can then be queried on demand. |
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| 39 | * |
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| 40 | * @var array |
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| 41 | */ |
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| 42 | protected $hidden = ['lyrics', 'updated_at', 'path', 'mtime']; |
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| 43 | |||
| 44 | /** |
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| 45 | * @var array |
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| 46 | */ |
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| 47 | protected $casts = [ |
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| 48 | 'length' => 'float', |
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| 49 | 'mtime' => 'int', |
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| 50 | 'track' => 'int', |
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| 51 | ]; |
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| 52 | |||
| 53 | /** |
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| 54 | * Indicates if the IDs are auto-incrementing. |
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| 55 | * |
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| 56 | * @var bool |
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| 57 | */ |
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| 58 | public $incrementing = false; |
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| 59 | |||
| 60 | public function artist() |
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| 64 | |||
| 65 | public function album() |
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| 69 | |||
| 70 | public function playlists() |
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| 74 | |||
| 75 | /** |
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| 76 | * Scrobble the song using Last.fm service. |
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| 77 | * |
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| 78 | * @param User $user |
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| 79 | * @param string $timestamp The UNIX timestamp in which the song started playing. |
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| 80 | * |
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| 81 | * @return mixed |
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| 82 | */ |
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| 83 | public function scrobble(User $user, $timestamp) |
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| 103 | |||
| 104 | /** |
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| 105 | * Get a Song record using its path. |
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| 106 | * |
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| 107 | * @param string $path |
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| 108 | * |
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| 109 | * @return Song|null |
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| 110 | */ |
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| 111 | public static function byPath($path) |
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| 115 | |||
| 116 | /** |
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| 117 | * Update song info. |
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| 118 | * |
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| 119 | * @param array $ids |
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| 120 | * @param array $data The data array, with these supported fields: |
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| 121 | * - title |
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| 122 | * - artistName |
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| 123 | * - albumName |
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| 124 | * - lyrics |
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| 125 | * All of these are optional, in which case the info will not be changed |
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| 126 | * (except for lyrics, which will be emptied). |
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| 127 | * |
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| 128 | * @return array |
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| 129 | */ |
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| 130 | public static function updateInfo($ids, $data) |
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| 169 | |||
| 170 | /** |
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| 171 | * Update a single song's info. |
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| 172 | * |
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| 173 | * @param string $title |
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| 174 | * @param string $albumName |
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| 175 | * @param string $artistName |
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| 176 | * @param string $lyrics |
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| 177 | * @param int $track |
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| 178 | * @param int $compilationState |
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| 179 | * |
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| 180 | * @return self |
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| 181 | */ |
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| 182 | public function updateSingle($title, $albumName, $artistName, $lyrics, $track, $compilationState) |
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| 223 | |||
| 224 | /** |
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| 225 | * Scope a query to only include songs in a given directory. |
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| 226 | * |
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| 227 | * @param \Illuminate\Database\Eloquent\Builder $query |
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| 228 | * @param string $path Full path of the directory |
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| 229 | * |
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| 230 | * @return \Illuminate\Database\Eloquent\Builder |
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| 231 | */ |
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| 232 | public function scopeInDirectory($query, $path) |
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| 239 | |||
| 240 | /** |
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| 241 | * Get all songs favored by a user. |
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| 242 | * |
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| 243 | * @param User $user |
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| 244 | * @param bool $toArray |
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| 245 | * |
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| 246 | * @return \Illuminate\Database\Eloquent\Collection|array |
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| 247 | */ |
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| 248 | public static function getFavorites(User $user, $toArray = false) |
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| 257 | |||
| 258 | /** |
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| 259 | * Get the song's Object Storage url for streaming or downloading. |
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| 260 | * |
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| 261 | * @param AwsClient $s3 |
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| 262 | * |
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| 263 | * @return string |
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| 264 | */ |
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| 265 | public function getObjectStoragePublicUrl(AwsClient $s3 = null) |
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| 290 | |||
| 291 | public function getGcpObjectStoragePublicUrl(StorageClient $gcs = null) |
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| 308 | |||
| 309 | |||
| 310 | |||
| 311 | /** |
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| 312 | * Get the YouTube videos related to this song. |
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| 313 | * |
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| 314 | * @param string $youTubePageToken The YouTube page token, for pagination purpose. |
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| 315 | * |
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| 316 | * @return @return object|false |
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| 317 | */ |
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| 318 | public function getRelatedYouTubeVideos($youTubePageToken = '') |
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| 322 | |||
| 323 | /** |
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| 324 | * Sometimes the tags extracted from getID3 are HTML entity encoded. |
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| 325 | * This makes sure they are always sane. |
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| 326 | * |
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| 327 | * @param $value |
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| 328 | */ |
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| 329 | public function setTitleAttribute($value) |
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| 333 | |||
| 334 | /** |
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| 335 | * Some songs don't have a title. |
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| 336 | * Fall back to the file name (without extension) for such. |
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| 337 | * |
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| 338 | * @param $value |
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| 339 | * |
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| 340 | * @return string |
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| 341 | */ |
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| 342 | public function getTitleAttribute($value) |
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| 346 | |||
| 347 | /** |
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| 348 | * Prepare the lyrics for displaying. |
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| 349 | * |
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| 350 | * @param $value |
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| 351 | * |
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| 352 | * @return string |
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| 353 | */ |
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| 354 | public function getLyricsAttribute($value) |
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| 361 | |||
| 362 | /** |
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| 363 | * Determine if the song is an AWS S3 Object. |
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| 364 | * |
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| 365 | * @return bool |
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| 366 | */ |
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| 367 | public function isS3ObjectAttribute() |
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| 371 | |||
| 372 | /** |
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| 373 | * Get the bucket and key name of an S3 object. |
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| 374 | * |
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| 375 | * @return bool|array |
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| 376 | */ |
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| 377 | View Code Duplication | public function getS3ParamsAttribute() |
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| 387 | |||
| 388 | public function isGCPObjectAttribute() |
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| 392 | |||
| 393 | /** |
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| 394 | * Get the bucket and key name of an GCS object. |
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| 395 | * |
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| 396 | * @return bool|array |
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| 397 | */ |
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| 398 | View Code Duplication | public function getGCPParamsAttribute() |
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| 408 | } |
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| 409 |
It seems like the method you are trying to call exists only in some of the possible types.
Let’s take a look at an example:
Available Fixes
Add an additional type-check:
Only allow a single type to be passed if the variable comes from a parameter: