def test_get_embed_hash(self):
url = "www.test.com/1234"
self.assertEqual(get_embed_hash(url),
"9a4cfc187266026cd68160b5db572629")
self.assertEqual(get_embed_hash(url, 0),
"946fb9597a6c74ab3cef1699eff7fde7")
self.assertEqual(get_embed_hash(url, 1),
"427830227a86093b50417e11dbd2f28e")
def migrate_forwards(apps, schema_editor):
Embed = apps.get_model("wagtailembeds.Embed")
# based each embed being ~500b, available memory being
# to 2MB, and leaving plenty of headway for app itself
batch_size = 1500
# allows small batches to be kept in memory in order
# to utilise bulk_update()
batch = []
for embed in Embed.objects.all().only("id", "url", "max_width").iterator():
embed.hash = get_embed_hash(embed.url, embed.max_width)
batch.append(embed)
if len(batch) == batch_size:
# save and reset current batch
Embed.objects.bulk_update(batch, ["hash"])
batch.clear()
# save any leftovers
if batch:
Embed.objects.bulk_update(batch, ["hash"])
# delete duplicates
duplicates = (Embed.objects.values("hash").annotate(
hash_count=Count("id"), min_id=Min("id")).filter(hash_count__gt=1))
for dup in duplicates:
# for each duplicated hash, delete all except the one with the lowest id
Embed.objects.filter(hash=dup["hash"]).exclude(
id=dup["min_id"]).delete()
def migrate_forwards(apps, schema_editor):
Embed = apps.get_model("wagtailembeds.Embed")
# based each embed being ~500b, available memory being
# to 2MB, and leaving plenty of headway for app itself
batch_size = 1500
# allows small batches to be kept in memory in order
# to utilise bulk_update()
batch = []
for embed in Embed.objects.all().only("id", "url", "max_width").iterator():
embed.hash = get_embed_hash(embed.url, embed.max_width)
batch.append(embed)
if len(batch) == batch_size:
# save and reset current batch
Embed.objects.bulk_update(batch, ["hash"])
batch.clear()
# save any leftovers
if batch:
Embed.objects.bulk_update(batch, ["hash"])