fix: set preserve order for serde (#93)

Closes #85.

Author: gadomski

CHANGELOG.md

@@ -11,7 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ### Fixed
 
-- Deterministic asset ordering ([rustac #709](https://github.com/stac-utils/rustac/pull/709))
+- Deterministic asset ordering ([rustac #709](https://github.com/stac-utils/rustac/pull/709), [#93](https://github.com/stac-utils/rustac-py/pull/93))
 
 ## [0.6.0] - 2025-04-18
 

Cargo.toml

@@ -23,7 +23,7 @@ pyo3-async-runtimes = { version = "0.24.0", features = [
 pyo3-arrow = "0.8.0"
 pythonize = "0.24.0"
 serde = "1.0.217"
-serde_json = "1.0.138"
+serde_json = { version = "1.0.138", features = ["preserve_order"] }
 stac = { features = [
     "geoparquet-compression",
     "object-store-all",

tests/test_read.py

@@ -7,3 +7,13 @@
 async def test_read(examples: Path) -> None:
     item = Item.from_dict(await rustac.read(str(examples / "simple-item.json")))
     item.validate()
+
+
+async def test_asset_ordering(examples: Path) -> None:
+    # Not a perfect test but should be good enough for https://github.com/stac-utils/rustac-py/issues/85
+    lists = []
+    for _ in range(10):
+        item = await rustac.read(str(examples / "extended-item.json"))
+        lists.append(list(item["assets"].keys()))
+    for sublist in lists[1:]:
+        assert lists[0] == sublist