fix: autoincrement collection (#337)

arango/database.py

@@ -1442,10 +1442,11 @@ def create_collection(
         :raise arango.exceptions.CollectionCreateError: If create fails.
         """
         key_options: Json = {"type": key_generator, "allowUserKeys": user_keys}
-        if key_increment is not None:
-            key_options["increment"] = key_increment
-        if key_offset is not None:
-            key_options["offset"] = key_offset
+        if key_generator == "autoincrement":
+            if key_increment is not None:
+                key_options["increment"] = key_increment
+            if key_offset is not None:
+                key_options["offset"] = key_offset
 
         data: Json = {
             "name": name,

tests/test_collection.py

@@ -190,14 +190,21 @@ def test_collection_management(db, bad_db, cluster):
         }
     ]
 
+    col = db.create_collection(
+        name=col_name, key_generator="autoincrement", key_increment=9, key_offset=100
+    )
+    key_options = col.properties()["key_options"]
+    assert key_options["key_generator"] == "autoincrement"
+    assert key_options["key_increment"] == 9
+    assert key_options["key_offset"] == 100
+    db.delete_collection(col_name)
+
     col = db.create_collection(
         name=col_name,
         sync=True,
         system=False,
         key_generator="traditional",
         user_keys=False,
-        key_increment=9,
-        key_offset=100,
         edge=True,
         shard_count=2,
         shard_fields=["test_attr:"],