Complex classes like JsonApiController 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 JsonApiController, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 16 | abstract class JsonApiController extends Controller  | 
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| 17 | { | 
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| 18 | use JsonApiErrors, JsonApiTransforms;  | 
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| 19 | |||
| 20 | /**  | 
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| 21 | * Return the Eloquent Model for the resource.  | 
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| 22 | *  | 
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| 23 | * @return Model  | 
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| 24 | */  | 
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| 25 | abstract protected function getModel();  | 
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| 26 | |||
| 27 | /**  | 
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| 28 | * Return the type name of the resource.  | 
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| 29 | *  | 
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| 30 | * @return string  | 
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| 31 | */  | 
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| 32 | protected function getModelType()  | 
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| 36 | |||
| 37 | /**  | 
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| 38 | * The model relationships that can be updated.  | 
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| 39 | *  | 
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| 40 | * @return string  | 
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| 41 | */  | 
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| 42 | protected function getModelRelationships()  | 
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| 46 | |||
| 47 | /**  | 
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| 48 | * Return a listing of the resource.  | 
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| 49 | *  | 
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| 50 | * @param Request $request  | 
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| 51 | * @param \Illuminate\Database\Eloquent\Builder|null $query Custom resource query  | 
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| 52 | *  | 
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| 53 | * @return JsonApiResponse  | 
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| 54 | */  | 
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| 55 | public function indexAction(Request $request, $query = null)  | 
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| 71 | |||
| 72 | /**  | 
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| 73 | * Store a new record.  | 
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| 74 | *  | 
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| 75 | * @param Request $request  | 
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| 76 | *  | 
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| 77 | * @return JsonApiResponse  | 
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| 78 | */  | 
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| 79 | public function storeAction(Request $request)  | 
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| 89 | |||
| 90 | /**  | 
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| 91 | * Return a specified record.  | 
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| 92 | *  | 
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| 93 | * @param Request $request  | 
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| 94 | * @param Model|int $record  | 
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| 95 | *  | 
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| 96 | * @return JsonApiResponse  | 
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| 97 | */  | 
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| 98 | public function showAction(Request $request, $record)  | 
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| 105 | |||
| 106 | /**  | 
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| 107 | * Update a specified record.  | 
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| 108 | *  | 
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| 109 | * @param Request $request  | 
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| 110 | * @param Model|int $record  | 
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| 111 | *  | 
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| 112 | * @return JsonApiResponse  | 
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| 113 | */  | 
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| 114 | public function updateAction(Request $request, $record)  | 
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| 125 | |||
| 126 | /**  | 
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| 127 | * Destroy a specified record.  | 
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| 128 | *  | 
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| 129 | * @param Request $request  | 
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| 130 | * @param Model|int $record  | 
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| 131 | *  | 
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| 132 | * @return JsonApiResponse  | 
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| 133 | */  | 
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| 134 | public function destroyAction(Request $request, $record)  | 
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| 141 | |||
| 142 | /**  | 
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| 143 | * Return a specified record relationship.  | 
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| 144 | *  | 
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| 145 | * @param Request $request  | 
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| 146 | * @param Model|int $record  | 
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| 147 | * @param string $relation  | 
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| 148 | *  | 
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| 149 | * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException  | 
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| 150 | *  | 
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| 151 | * @return JsonApiResponse  | 
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| 152 | */  | 
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| 153 | public function relationshipAction(Request $request, $record, $relation)  | 
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| 175 | |||
| 176 | /**  | 
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| 177 | * Update a named many-to-one relationship association on a specified record.  | 
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| 178 | * http://jsonapi.org/format/#crud-updating-to-one-relationships  | 
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| 179 | *  | 
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| 180 | * @param Request $request  | 
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| 181 | * @param Model|int $record  | 
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| 182 | * @param string $relation  | 
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| 183 | * @param string|null $foreignKey  | 
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| 184 | *  | 
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| 185 | * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException  | 
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| 186 | *  | 
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| 187 | * @return JsonApiResponse  | 
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| 188 | */  | 
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| 189 | public function updateToOneRelationshipAction(Request $request, $record, $relation, $foreignKey = null)  | 
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| 200 | |||
| 201 | /**  | 
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| 202 | * Update named many-to-many relationship entries on a specified record.  | 
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| 203 | * http://jsonapi.org/format/#crud-updating-to-many-relationships  | 
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| 204 | *  | 
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| 205 | * @param Request $request  | 
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| 206 | * @param Model|int $record  | 
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| 207 | * @param string $relation  | 
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| 208 | *  | 
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| 209 | * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException  | 
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| 210 | *  | 
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| 211 | * @return JsonApiResponse  | 
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| 212 | */  | 
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| 213 | public function updateToManyRelationshipAction(Request $request, $record, $relation)  | 
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| 242 | |||
| 243 | /**  | 
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| 244 | * Return an instance of the resource by primary key.  | 
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| 245 | *  | 
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| 246 | * @param int $key  | 
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| 247 | *  | 
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| 248 | * @throws \Illuminate\Database\Eloquent\ModelNotFoundException  | 
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| 249 | *  | 
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| 250 | * @return Model  | 
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| 251 | */  | 
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| 252 | protected function findModelInstance($key)  | 
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| 256 | |||
| 257 | /**  | 
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| 258 | * Return any JSON API resource parameters from a request.  | 
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| 259 | *  | 
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| 260 | * @param Request $request  | 
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| 261 | *  | 
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| 262 | * @return array  | 
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| 263 | */  | 
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| 264 | protected function getRequestParameters($request)  | 
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| 273 | |||
| 274 | /**  | 
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| 275 | * Return any comma separated values in a request query field as an array.  | 
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| 276 | *  | 
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| 277 | * @param Request $request  | 
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| 278 | * @param string $key  | 
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| 279 | *  | 
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| 280 | * @return array  | 
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| 281 | */  | 
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| 282 | protected function getRequestQuerySet($request, $key)  | 
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| 286 | |||
| 287 | /**  | 
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| 288 | * Sort a resource query by one or more attributes.  | 
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| 289 | *  | 
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| 290 | * @param \Illuminate\Database\Eloquent\Builder $query  | 
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| 291 | * @param array $attributes  | 
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| 292 | *  | 
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| 293 | * @return \Illuminate\Database\Eloquent\Builder  | 
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| 294 | */  | 
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| 295 | protected function sortQuery($query, $attributes)  | 
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| 305 | |||
| 306 | /**  | 
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| 307 | * Filter a resource query by one or more attributes.  | 
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| 308 | *  | 
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| 309 | * @param \Illuminate\Database\Eloquent\Builder $query  | 
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| 310 | * @param array $attributes  | 
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| 311 | *  | 
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| 312 | * @return \Illuminate\Database\Eloquent\Builder  | 
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| 313 | */  | 
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| 314 | protected function filterQuery($query, $attributes)  | 
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| 331 | |||
| 332 | /**  | 
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| 333 | * Update one or more relationships on a model instance.  | 
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| 334 | *  | 
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| 335 | * @param Model $record  | 
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| 336 | * @param array $relationships  | 
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| 337 | */  | 
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| 338 | protected function updateRecordRelationships($record, array $relationships)  | 
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| 353 | }  | 
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| 354 | 
This check looks from parameters that have been defined for a function or method, but which are not used in the method body.