Resolve broken fixtures in dev dataset script for local Dandi

DEVELOPMENT.md

@@ -93,7 +93,7 @@ When running the "Develop with Docker" configuration, all tox commands must be r
 Run `tox` to launch the full test suite.
 
 Individual test environments may be selectively run.
-This also allows additional options to be be added.
+This also allows additional options to be added.
 Useful sub-commands include:
 * `tox -e lint`: Run only the style checks
 * `tox -e type`: Run only the type checks
@@ -122,7 +122,7 @@ to call.
 
 ### Creating a Token
 Visit the URL `/admin` with a web browser, logging
-in with the credentials entered during the `createsuperuser` setup step..
+in with the credentials entered during the `createsuperuser` setup step.
 Then go to `/swagger` and use `GET /auth/token` end-point.
 
 ### Supplying the Token

dandiapi/api/management/commands/create_dev_dandiset.py

@@ -1,3 +1,4 @@
+import hashlib
 from uuid import uuid4
 
 from django.conf import settings
@@ -15,8 +16,13 @@
 @click.command()
 @click.option('--name', default='Development Dandiset')
 @click.option('--owner', 'email', required=True, help='The email address of the owner')
-def create_dev_dandiset(name: str, email: str):
+@click.option('--first_name', default='Randi')
+@click.option('--last_name', default='Dandi')
+def create_dev_dandiset(name: str, email: str, first_name: str, last_name: str):
     owner = User.objects.get(email=email)
+    owner.first_name = first_name
+    owner.last_name = last_name
+    owner.save()
 
     version_metadata = {
         'description': 'An informative description',
@@ -26,16 +32,19 @@ def create_dev_dandiset(name: str, email: str):
         user=owner, embargo=False, version_name=name, version_metadata=version_metadata
     )
 
-    uploaded_file = SimpleUploadedFile(name='foo/bar.txt', content=b'A' * 20)
+    file_size = 20
+    file_content = b'A' * file_size
+    uploaded_file = SimpleUploadedFile(name='foo/bar.txt', content=file_content)
     etag = '76d36e98f312e98ff908c8c82c8dd623-0'
+
     try:
         asset_blob = AssetBlob.objects.get(etag=etag)
     except AssetBlob.DoesNotExist:
+        # Since the SimpleUploadedFile is non-zarr asset, validation fails
+        # without a sha2_256 initially provided.
+        sha256_hash = hashlib.sha256(file_content).hexdigest()
         asset_blob = AssetBlob(
-            blob_id=uuid4(),
-            blob=uploaded_file,
-            etag=etag,
-            size=20,
+            blob_id=uuid4(), blob=uploaded_file, etag=etag, size=file_size, sha256=sha256_hash
         )
         asset_blob.save()
     asset_metadata = {