Stock history fix (#320)

* Improves quantity parsing from

* Add paginated history widget

* Refactor stock history widget as a paginated widget

* Allow paginated result list to handle results returned as list

- Some API endpoints (older ones most likely) don't paginate results correctly

* Fix code layout

* Render user information in "history" widget (not quantity)

* Hide filter button

* Update release notes

* remove unused import

lib/inventree/model.dart

@@ -575,10 +575,12 @@ class InvenTreeModel {
     // Construct the response
     InvenTreePageResponse page = InvenTreePageResponse();
 
-    var data = response.asMap();
+    var dataMap = response.asMap();
 
-    if (data.containsKey("count") && data.containsKey("results")) {
-       page.count = (data["count"] ?? 0) as int;
+    // First attempt is to look for paginated data, returned as a map
+
+    if (dataMap.isNotEmpty && dataMap.containsKey("count") && dataMap.containsKey("results")) {
+      page.count = (dataMap["count"] ?? 0) as int;
 
        page.results = [];
 
@@ -587,15 +589,28 @@ class InvenTreeModel {
        }
 
        return page;
-
-    } else {
-      return null;
     }
+
+    // Second attempt is to look for a list of data (not paginated)
+    var dataList = response.asList();
+
+    if (dataList.isNotEmpty) {
+      page.count = dataList.length;
+      page.results = [];
+
+      for (var result in dataList) {
+        page.addResult(createFromJson(result as Map<String, dynamic>));
+    }
+
+      return page;
+    }
+
+    // Finally, no results available
+    return null;
   }
 
   // Return list of objects from the database, with optional filters
   Future<List<InvenTreeModel>> list({Map<String, String> filters = const {}}) async {
-
     var params = defaultListFilters();
 
     for (String key in filters.keys) {

lib/inventree/stock.dart

@@ -23,9 +23,7 @@ class InvenTreeStockItemTestResult extends InvenTreeModel {
   @override
   Map<String, dynamic> formFields() {
     return {
-      "stock_item": {
-        "hidden": true
-      },
+      "stock_item": {"hidden": true},
       "test": {},
       "result": {},
       "value": {},
@@ -75,6 +73,7 @@ class InvenTreeStockItemHistory extends InvenTreeModel {
     // By default, order by decreasing date
     return {
       "ordering": "-date",
+      "user_detail": "true",
     };
   }
 
@@ -98,21 +97,31 @@ class InvenTreeStockItemHistory extends InvenTreeModel {
 
   String get label => (jsondata["label"] ?? "") as String;
 
-  String get quantityString {
-    Map<String, dynamic> deltas = (jsondata["deltas"] ?? {}) as Map<String, dynamic>;
+  // Return the "deltas" associated with this historical object
+  Map<String, dynamic> get deltas {
+    if (jsondata.containsKey("deltas")) {
+      return jsondata["deltas"] as Map<String, dynamic>;
+    } else {
+      return {};
+    }
+  }
 
-    // Serial number takes priority here
-    if (deltas.containsKey("serial")) {
-      var serial = (deltas["serial"] ?? "").toString();
-      return "# ${serial}";
-    } else if (deltas.containsKey("quantity")) {
-      double q = (deltas["quantity"] ?? 0) as double;
+  // Return the quantity string for this historical object
+  String get quantityString {
+    var _deltas = deltas;
+
+    if (_deltas.containsKey("quantity")) {
+      double q = double.tryParse(_deltas["quantity"].toString()) ?? 0;
 
       return simpleNumberString(q);
     } else {
       return "";
     }
   }
+
+  String get userString {
+    return (jsondata["user_detail"]?["username"] ?? "") as String;
+  }
 }