lib/components/dataInterface/connectors/file/DataSource.php
protected function loadForeignDataItems()
    {
        if (!$this->fileSource) {
            \d("boom");

            return false;
        }
        $foreignModelClass = $this->foreignModelClass;

        $lines = $this->fileSource->getLines($this->lazyForeign);
        $lineCount = 0;
        foreach ($lines as $id => $line) {
            if ($this->lazyForeign) {
                $this->createForeignDataItem(null, ['deferredModel' => $line]);
            } else {
                $model = $this->createModel($line->id, $line->attributes);
                $this->createForeignDataItem($model, ['deferredModel' => $line]);
            }
            $lineCount++;
        }
        $this->task->addInfo("Processed {$lineCount} lines from {$this->fileSource->id}");
    }
protected function loadForeignDataItems()
    {
        if (!$this->fileSource) {
            \d("boom");

            return false;
        }
        $foreignModelClass = $this->foreignModelClass;

        $lines = $this->fileSource->getLines($this->lazyForeign);
        $lineCount = 0;
        foreach ($lines as $id => $line) {
            if ($this->lazyForeign) {
                $this->createForeignDataItem(null, ['deferredModel' => $line]);
            } else {
                $model = $this->createModel($line->id, $line->attributes);
                $this->createForeignDataItem($model, ['deferredModel' => $line]);
            }
            $lineCount++;
        }
        $this->task->addInfo("Processed {$lineCount} lines from {$this->fileSource->id}");
    }
Load the data items from the file source.

@return bool|null False on fail, null on success (@todo change this to true)