Consistent ordering of CSV fields (#1333)

Paired with https://github.com/rojo-rbx/rbx-dom/pull/668

This fixes a bug where the first sync of a place with LocalizationTables
would always fail diff, since Roblox computes it at runtime

CHANGELOG.md

@@ -31,6 +31,10 @@ Making a new release? Simply add the new header with the version and date undern
 
 ## Unreleased
 
+* LocalizationTables no longer report as changed when nothing changes. [(#1333)]
+
+[#1333]: https://github.com/rojo-rbx/rojo/pull/1333
+
 ## [7.7.1] (October 1st, 2026)
 
 * Fixed `$path` values that point outside the project folder failing to match `syncRule`s on Windows, which broke `rojo sourcemap` with a "could not be turned into a Roblox Instance" error. ([#1290])
@@ -38,6 +42,7 @@ Making a new release? Simply add the new header with the version and date undern
 * Fixed `rojo sourcemap --absolute` emitting verbatim (`\\?\`) paths on Windows, which broke require types in luau-lsp. ([#1290])
 * The plugin now disables the `Check for Updates` setting if you block access to `api.github.com`. ([#1297])
 
+[7.7.1]: https://github.com/rojo-rbx/rojo/releases/tag/v7.7.1
 [#1290]: https://github.com/rojo-rbx/rojo/pull/1290
 [#1297]: https://github.com/rojo-rbx/rojo/pull/1297
 
@@ -60,6 +65,7 @@ Making a new release? Simply add the new header with the version and date undern
 * `rojo serve` now validates the `Host`/`Origin` headers to protect the local/private server against DNS rebinding, gates `/api/open` to local clients, and warns when bound to a network-reachable address. The accepted hosts can be extended with the `--allowed-hosts` option or a project's `serveAllowedHosts` field, for example to reach a network-exposed server by hostname. ([#1270])
 * Fixed syncback not removing stale `$properties` entries when Studio resets a property to its engine default. ([#1244])
 
+[7.7.0]: https://github.com/rojo-rbx/rojo/releases/tag/v7.7.0
 [#1176]: https://github.com/rojo-rbx/rojo/pull/1176
 [#1179]: https://github.com/rojo-rbx/rojo/pull/1179
 [#1192]: https://github.com/rojo-rbx/rojo/pull/1192

rojo-test/build-test-snapshots/end_to_end__tests__build__csv_bug_145.snap

@@ -10,7 +10,7 @@ expression: contents
     <Item class="LocalizationTable" referent="1">
       <Properties>
         <string name="Name">normal</string>
-        <string name="Contents">[{"key":"Count","example":"A number demonstrating issue 145","source":"3","values":{"es":"7"}}]</string>
+        <string name="Contents">[{"example":"A number demonstrating issue 145","key":"Count","source":"3","values":{"es":"7"}}]</string>
       </Properties>
     </Item>
   </Item>

rojo-test/build-test-snapshots/end_to_end__tests__build__csv_bug_147.snap

@@ -10,7 +10,7 @@ expression: contents
     <Item class="LocalizationTable" referent="1">
       <Properties>
         <string name="Name">normal</string>
-        <string name="Contents">[{"key":"Language.Name","source":"English","values":{}},{"key":"Language.Region","source":"United States","values":{}},{"key":"Label.Thickness","source":"Thickness","values":{}},{"key":"Label.Opacity","source":"Opacity","values":{}},{"key":"Toolbar.Undo","source":"Undo","values":{}},{"key":"Toolbar.Redo","source":"Redo","values":{}},{"key":"Toolbar.Camera","source":"Top-down camera","values":{}},{"key":"Toolbar.Saves","source":"Saved drawings","values":{}},{"key":"Toolbar.Preferences","source":"Settings","values":{}},{"key":"Toolbar.Mode.Vector","source":"Vector mode","values":{}},{"key":"Toolbar.Mode.Pixel","source":"Pixel mode","values":{}}]</string>
+        <string name="Contents">[{"key":"Label.Opacity","source":"Opacity","values":{}},{"key":"Label.Thickness","source":"Thickness","values":{}},{"key":"Language.Name","source":"English","values":{}},{"key":"Language.Region","source":"United States","values":{}},{"key":"Toolbar.Camera","source":"Top-down camera","values":{}},{"key":"Toolbar.Mode.Pixel","source":"Pixel mode","values":{}},{"key":"Toolbar.Mode.Vector","source":"Vector mode","values":{}},{"key":"Toolbar.Preferences","source":"Settings","values":{}},{"key":"Toolbar.Redo","source":"Redo","values":{}},{"key":"Toolbar.Saves","source":"Saved drawings","values":{}},{"key":"Toolbar.Undo","source":"Undo","values":{}}]</string>
       </Properties>
     </Item>
   </Item>

rojo-test/build-test-snapshots/end_to_end__tests__build__csv_in_folder.snap

@@ -10,7 +10,7 @@ expression: contents
     <Item class="LocalizationTable" referent="1">
       <Properties>
         <string name="Name">normal</string>
-        <string name="Contents">[{"key":"Ack","example":"An exclamation of despair","source":"Ack!","values":{"es":"¡Ay!"}}]</string>
+        <string name="Contents">[{"example":"An exclamation of despair","key":"Ack","source":"Ack!","values":{"es":"¡Ay!"}}]</string>
       </Properties>
     </Item>
   </Item>

src/snapshot_middleware/csv.rs

@@ -162,13 +162,11 @@ pub fn syncback_csv_init<'sync>(
 ///
 /// We manually deserialize into this table from CSV, but let serde_json handle
 /// serialization.
-#[derive(Debug, Default, Serialize, Deserialize)]
+#[derive(Debug, Default, Deserialize)]
 #[serde(rename_all = "camelCase")]
 struct LocalizationEntry<'a> {
-    #[serde(skip_serializing_if = "Option::is_none")]
     key: Option<Cow<'a, str>>,
 
-    #[serde(skip_serializing_if = "Option::is_none")]
     context: Option<Cow<'a, str>>,
 
     // Roblox writes `examples` for LocalizationTable's Content property, which
@@ -176,16 +174,77 @@ struct LocalizationEntry<'a> {
     // This is reported here: https://devforum.roblox.com/t/2908720.
     //
     // To support their mistake, we support an alias named `examples`.
-    #[serde(skip_serializing_if = "Option::is_none", alias = "examples")]
+    #[serde(alias = "examples")]
     example: Option<Cow<'a, str>>,
 
-    #[serde(skip_serializing_if = "Option::is_none")]
     source: Option<Cow<'a, str>>,
 
     // We use a BTreeMap here to get deterministic output order.
     values: BTreeMap<Cow<'a, str>, Cow<'a, str>>,
 }
 
+// Guarantee a specific order of both fields and entries so that diff always match up
+impl<'a> Serialize for LocalizationEntry<'a> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        let mut btree = BTreeMap::new();
+
+        if let Some(key) = &self.key {
+            btree.insert(
+                "key",
+                serde_json::to_value(key).map_err(serde::ser::Error::custom)?,
+            );
+        }
+
+        if let Some(context) = &self.context {
+            btree.insert(
+                "context",
+                serde_json::to_value(context).map_err(serde::ser::Error::custom)?,
+            );
+        }
+
+        if let Some(example) = &self.example {
+            btree.insert(
+                "example",
+                serde_json::to_value(example).map_err(serde::ser::Error::custom)?,
+            );
+        }
+
+        if let Some(source) = &self.source {
+            btree.insert(
+                "source",
+                serde_json::to_value(source).map_err(serde::ser::Error::custom)?,
+            );
+        }
+
+        btree.insert(
+            "values",
+            serde_json::to_value(&self.values).map_err(serde::ser::Error::custom)?,
+        );
+
+        btree.serialize(serializer)
+    }
+}
+
+fn sort_localization_entries(mut entries: Vec<LocalizationEntry>) -> Vec<LocalizationEntry> {
+    entries.sort_by(|a, b| {
+        a.key
+            .as_deref()
+            .unwrap_or_default()
+            .cmp(&b.key.as_deref().unwrap_or_default())
+            .then_with(|| {
+                a.source
+                    .as_deref()
+                    .unwrap_or_default()
+                    .cmp(&b.source.as_deref().unwrap_or_default())
+            })
+    });
+
+    entries
+}
+
 /// Normally, we'd be able to let the csv crate construct our struct for us.
 ///
 /// However, because of a limitation with Serde's 'flatten' feature, it's not
@@ -236,8 +295,8 @@ fn convert_localization_csv(contents: &[u8]) -> anyhow::Result<String> {
         entries.push(entry);
     }
 
-    let encoded =
-        serde_json::to_string(&entries).context("Could not encode JSON for localization table")?;
+    let encoded = serde_json::to_string(&sort_localization_entries(entries))
+        .context("Could not encode JSON for localization table")?;
 
     Ok(encoded)
 }
@@ -249,11 +308,9 @@ fn localization_to_csv(csv_contents: &str) -> anyhow::Result<Vec<u8>> {
     let mut out = Vec::new();
     let mut writer = csv::Writer::from_writer(&mut out);
 
-    let mut csv: Vec<LocalizationEntry> =
-        serde_json::from_str(csv_contents).context("cannot decode JSON from localization table")?;
-
-    // TODO sort this better
-    csv.sort_by(|a, b| a.source.partial_cmp(&b.source).unwrap());
+    let csv: Vec<LocalizationEntry> = sort_localization_entries(
+        serde_json::from_str(csv_contents).context("cannot decode JSON from localization table")?,
+    );
 
     let mut headers = vec!["Key", "Source", "Context", "Example"];
     // We want both order and a lack of duplicates, so we use a BTreeSet.

src/snapshot_middleware/snapshots/librojo__snapshot_middleware__csv__test__csv_from_vfs.snap

@@ -20,5 +20,5 @@ name: foo
 class_name: LocalizationTable
 properties:
   Contents:
-    String: "[{\"key\":\"Ack\",\"example\":\"An exclamation of despair\",\"source\":\"Ack!\",\"values\":{\"es\":\"¡Ay!\"}}]"
+    String: "[{\"example\":\"An exclamation of despair\",\"key\":\"Ack\",\"source\":\"Ack!\",\"values\":{\"es\":\"¡Ay!\"}}]"
 children: []

src/snapshot_middleware/snapshots/librojo__snapshot_middleware__csv__test__csv_init.snap

@@ -29,5 +29,5 @@ name: root
 class_name: LocalizationTable
 properties:
   Contents:
-    String: "[{\"key\":\"Ack\",\"example\":\"An exclamation of despair\",\"source\":\"Ack!\",\"values\":{\"es\":\"¡Ay!\"}}]"
+    String: "[{\"example\":\"An exclamation of despair\",\"key\":\"Ack\",\"source\":\"Ack!\",\"values\":{\"es\":\"¡Ay!\"}}]"
 children: []

src/snapshot_middleware/snapshots/librojo__snapshot_middleware__csv__test__csv_init_with_meta.snap

@@ -29,5 +29,5 @@ name: root
 class_name: LocalizationTable
 properties:
   Contents:
-    String: "[{\"key\":\"Ack\",\"example\":\"An exclamation of despair\",\"source\":\"Ack!\",\"values\":{\"es\":\"¡Ay!\"}}]"
+    String: "[{\"example\":\"An exclamation of despair\",\"key\":\"Ack\",\"source\":\"Ack!\",\"values\":{\"es\":\"¡Ay!\"}}]"
 children: []

src/snapshot_middleware/snapshots/librojo__snapshot_middleware__csv__test__csv_with_meta.snap

@@ -20,5 +20,5 @@ name: foo
 class_name: LocalizationTable
 properties:
   Contents:
-    String: "[{\"key\":\"Ack\",\"example\":\"An exclamation of despair\",\"source\":\"Ack!\",\"values\":{\"es\":\"¡Ay!\"}}]"
+    String: "[{\"example\":\"An exclamation of despair\",\"key\":\"Ack\",\"source\":\"Ack!\",\"values\":{\"es\":\"¡Ay!\"}}]"
 children: []