saving original field order on dumping (#247)

docs/changelog/fragments/247.bugfix.rst

@@ -0,0 +1 @@
+Model dumping now trying to save the original order of fields inside the dict

src/adaptix/_internal/morphing/name_layout/crown_builder.py

@@ -1,3 +1,4 @@
+import math
 from abc import ABC, abstractmethod
 from dataclasses import dataclass
 from itertools import groupby
@@ -35,13 +36,17 @@ class PathWithLeaf(Generic[LeafCr]):
 
 
 class BaseCrownBuilder(ABC, Generic[LeafCr, DictCr, ListCr]):
+    def __init__(self, paths_to_leaves: PathsTo[LeafCr]):
+        self._paths_to_leaves = paths_to_leaves
+        self._paths_to_order = {path: i for i, path in enumerate(paths_to_leaves)}
+
     def build_empty_crown(self, *, as_list: bool) -> Union[DictCr, ListCr]:
         if as_list:
             return self._make_list_crown(current_path=(), paths_with_leaves=[])
         return self._make_dict_crown(current_path=(), paths_with_leaves=[])
 
-    def build_crown(self, paths_to_leaves: PathsTo[LeafCr]) -> Union[DictCr, ListCr]:
-        paths_with_leaves = [PathWithLeaf(path, leaf) for path, leaf in paths_to_leaves.items()]
+    def build_crown(self) -> Union[DictCr, ListCr]:
+        paths_with_leaves = [PathWithLeaf(path, leaf) for path, leaf in self._paths_to_leaves.items()]
         paths_with_leaves.sort(key=lambda x: x.path)
         return cast(Union[DictCr, ListCr], self._build_crown(paths_with_leaves, 0))
 
@@ -67,10 +72,15 @@ def _get_dict_crown_map(
         current_path: KeyPath,
         paths_with_leaves: PathedLeaves[LeafCr],
     ) -> Mapping[str, Union[LeafCr, DictCr, ListCr]]:
-        return {
-            cast(str, key): self._build_crown(list(path_group), len(current_path) + 1)
+        dict_crown_map = {
+            key: self._build_crown(list(path_group), len(current_path) + 1)
             for key, path_group in groupby(paths_with_leaves, lambda x: x.path[len(current_path)])
         }
+        sorted_keys = sorted(
+            dict_crown_map,
+            key=lambda key: self._paths_to_order.get((*current_path, key), math.inf),
+        )
+        return {key: dict_crown_map[key] for key in sorted_keys}
 
     @abstractmethod
     def _make_dict_crown(self, current_path: KeyPath, paths_with_leaves: PathedLeaves[LeafCr]) -> DictCr:
@@ -98,8 +108,9 @@ def _make_list_crown(self, current_path: KeyPath, paths_with_leaves: PathedLeave
 
 
 class InpCrownBuilder(BaseCrownBuilder[LeafInpCrown, InpDictCrown, InpListCrown]):
-    def __init__(self, extra_policies: PathsTo[DictExtraPolicy]):
+    def __init__(self, extra_policies: PathsTo[DictExtraPolicy], paths_to_leaves: PathsTo[LeafInpCrown]):
         self.extra_policies = extra_policies
+        super().__init__(paths_to_leaves)
 
     def _make_dict_crown(self, current_path: KeyPath, paths_with_leaves: PathedLeaves[LeafInpCrown]) -> InpDictCrown:
         return InpDictCrown(
@@ -115,8 +126,9 @@ def _make_list_crown(self, current_path: KeyPath, paths_with_leaves: PathedLeave
 
 
 class OutCrownBuilder(BaseCrownBuilder[LeafOutCrown, OutDictCrown, OutListCrown]):
-    def __init__(self, path_to_sieves: PathsTo[Sieve]):
+    def __init__(self, path_to_sieves: PathsTo[Sieve], paths_to_leaves: PathsTo[LeafOutCrown]):
         self.path_to_sieves = path_to_sieves
+        super().__init__(paths_to_leaves)
 
     def _make_dict_crown(self, current_path: KeyPath, paths_with_leaves: PathedLeaves[LeafOutCrown]) -> OutDictCrown:
         key_to_sieve: Dict[str, Sieve] = {}

src/adaptix/_internal/morphing/name_layout/provider.py

@@ -62,7 +62,7 @@ def _create_input_crown(
         paths_to_leaves: PathsTo[LeafInpCrown],
         extra_policies: PathsTo[DictExtraPolicy],
     ) -> BranchInpCrown:
-        return InpCrownBuilder(extra_policies).build_crown(paths_to_leaves)
+        return InpCrownBuilder(extra_policies, paths_to_leaves).build_crown()
 
     def _create_empty_input_crown(
         self,
@@ -72,7 +72,7 @@ def _create_empty_input_crown(
         *,
         as_list: bool,
     ) -> BranchInpCrown:
-        return InpCrownBuilder(extra_policies).build_empty_crown(as_list=as_list)
+        return InpCrownBuilder(extra_policies, {}).build_empty_crown(as_list=as_list)
 
     @static_provision_action
     def _provide_output_name_layout(self, mediator: Mediator, request: OutputNameLayoutRequest) -> OutputNameLayout:
@@ -102,7 +102,7 @@ def _create_output_crown(
         paths_to_leaves: PathsTo[LeafOutCrown],
         path_to_sieve: PathsTo[Sieve],
     ) -> BranchOutCrown:
-        return OutCrownBuilder(path_to_sieve).build_crown(paths_to_leaves)
+        return OutCrownBuilder(path_to_sieve, paths_to_leaves).build_crown()
 
     def _create_empty_output_crown(
         self,
@@ -112,4 +112,4 @@ def _create_empty_output_crown(
         *,
         as_list: bool,
     ):
-        return OutCrownBuilder(path_to_sieve).build_empty_crown(as_list=as_list)
+        return OutCrownBuilder(path_to_sieve, {}).build_empty_crown(as_list=as_list)

tests/integration/morphing/test_dump_order.py

@@ -0,0 +1,35 @@
+from dataclasses import dataclass
+
+from adaptix import Retort, name_mapping
+
+
+def test_simple(accum):
+    @dataclass
+    class Example:
+        c: int
+        a: int
+        b: int
+
+    retort = Retort(recipe=[accum])
+
+    dumper = retort.get_dumper(Example)
+    assert list(dumper(Example(c=1, a=2, b=3)).items()) == [("c", 1), ("a", 2), ("b", 3)]
+
+
+def test_name_flatenning(accum):
+    @dataclass
+    class Example:
+        c: int
+        a: int
+        e: int
+        b: int
+
+    retort = Retort(
+        recipe=[
+            accum,
+            name_mapping(Example, map={"e": ("q", "e")}),
+        ],
+    )
+
+    dumper = retort.get_dumper(Example)
+    assert list(dumper(Example(c=1, a=2, e=3, b=4)).items()) == [("c", 1), ("a", 2), ("b", 4), ("q", {"e": 3})]