Fixing no thumbnail generation in Shopware 6

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Fixing no thumbnail generation in Shopware 6

written: 3 years ago category: Programming Next

While struggling with importing images into a Shopware database, I found the column media.media_type has to have a certain value, depending on the file extension (jpg, png, gif). Without a value in it,
bin/console media:generate-thumbnails
won't generate a thumbnail for this image.

Now, normally you should run
bin/console media:generate-media-types --batch-size=5000
to populate this column with the right values. But this process can really eat your time - it took 2 hours for my 70,000 images. And it even gets slower on each batch offset. Be sure at least to use a bigger batch-size than the default ridiculous 50.

If you have at least one image of each file extension in your media table, you can achieve the same with a very quick SQL query:
```
UPDATE media m1
SET media_type=
	(SELECT media_type FROM media
	WHERE file_extension=m1.file_extension AND media_type IS NOT NULL
	LIMIT 1)
WHERE media_type IS NULL;
```
HeidiSQL just said:
```
/* Affected rows: 1.622  Found rows: 0  Warnings: 0  Duration for 1 query: 0,172 sec. */
```
Of course this is a hack, and there is no support for it. So be aware of what you're doing, plus make a backup before running the update

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