src/Entities/Entity.php
public function getFieldManager()
    {
        /* Verifica se existe Field Manager com prefixo igual a controller */
        if (! $this->fieldManager) {
            $pathClassExploded = explode('\\', get_class($this));
            $namespace = array_first($pathClassExploded);
            $resourceName = array_last($pathClassExploded);
            
            /* Verifica se existe o Field Manager para o recurso */
            if (! class_exists("{$namespace}\\FieldManagers\\{$resourceName}FieldManager")) {
                return null;
                echo "Crie o Field Manager {$resourceName}FieldManager em {$namespace}\\FieldManagers";
                exit();
            }
            
            $this->fieldManager = $namespace . "\\FieldManagers\\{$resourceName}FieldManager";
        }
        
        /* Ainda precisa instanciar o objeto */
        if (is_string($this->fieldManager)) {
            return new $this->fieldManager();
        }
        
        /* Objeto já instanciado, só retornar */
        return $this->fieldManager;
    }
public function getFieldManager()
    {
        /* Verifica se existe Field Manager com prefixo igual a controller */
        if (! $this->fieldManager) {
            $pathClassExploded = explode('\\', get_class($this));
            $namespace = array_first($pathClassExploded);
            $resourceName = array_last($pathClassExploded);
            
            /* Verifica se existe o Field Manager para o recurso */
            if (! class_exists("{$namespace}\\FieldManagers\\{$resourceName}FieldManager")) {
                return null;
                echo "Crie o Field Manager {$resourceName}FieldManager em {$namespace}\\FieldManagers";
                exit();
            }
            
            $this->fieldManager = $namespace . "\\FieldManagers\\{$resourceName}FieldManager";
        }
        
        /* Ainda precisa instanciar o objeto */
        if (is_string($this->fieldManager)) {
            return new $this->fieldManager();
        }
        
        /* Objeto já instanciado, só retornar */
        return $this->fieldManager;
    }
Return instance Field Manager of controller

@return object Lab123\Odin\FieldManager