fix: summarize fixtures command (#92)

* fix: summarize fixtures command

* fix: remove new lines

codeforlife/user/management/__init__.py

@@ -0,0 +1,4 @@
+"""
+© Ocado Group
+Created on 22/02/2024 at 09:23:32(+00:00).
+"""

codeforlife/user/management/commands/__init__.py

@@ -0,0 +1,4 @@
+"""
+© Ocado Group
+Created on 22/02/2024 at 09:23:49(+00:00).
+"""

codeforlife/user/management/commands/summarize_fixtures.py

@@ -0,0 +1,84 @@
+"""
+© Ocado Group
+Created on 22/02/2024 at 09:24:27(+00:00).
+"""
+
+import json
+import os
+import typing as t
+from dataclasses import dataclass
+from itertools import groupby
+
+from django.apps import apps
+from django.core.management.base import BaseCommand
+
+from ....types import JsonDict
+
+
+@dataclass(frozen=True)
+class Fixture:
+    """A data model fixture."""
+
+    model: str
+    pk: t.Any
+    fields: JsonDict
+
+
+FixtureDict = t.Dict[str, t.List[Fixture]]
+
+
+# pylint: disable-next=missing-class-docstring
+class Command(BaseCommand):
+    help = "Summarizes all the listed fixtures by default"
+
+    def add_arguments(self, parser):
+        parser.add_argument("app_labels", nargs="?", type=str)
+
+    def _write_pks_per_model(self, fixtures: t.List[Fixture], indents: int = 0):
+        def get_model(fixture: Fixture):
+            return fixture.model
+
+        fixtures.sort(key=get_model)
+
+        self.stdout.write(f'{"    " * indents}Primary keys per model:')
+
+        for model, group in groupby(fixtures, key=get_model):
+            pks = [fixture.pk for fixture in group]
+            pks.sort()
+
+            self.stdout.write(f'{"    " * (indents + 1)}- {model}: {pks}')
+
+    def write_pks_per_model(self, fixtures: FixtureDict):
+        """Write all the sorted primary keys per model."""
+        self._write_pks_per_model(
+            [
+                fixture
+                for file_fixtures in fixtures.values()
+                for fixture in file_fixtures
+            ]
+        )
+
+    def write_pks_per_file(self, fixtures: FixtureDict):
+        """Write all the sorted primary keys per file, per model."""
+        self.stdout.write("Primary keys per file:")
+
+        for file, file_fixtures in fixtures.items():
+            self.stdout.write(f"    - {file}")
+            self._write_pks_per_model(file_fixtures, indents=2)
+
+    def handle(self, *args, **options):
+        fixtures: FixtureDict = {}
+        for app_label in [*(options["app_labels"] or []), "user"]:
+            app_config = apps.app_configs[app_label]
+            fixtures_path = os.path.join(app_config.path, "fixtures")
+
+            for fixture_name in os.listdir(fixtures_path):
+                fixture_path = os.path.join(fixtures_path, fixture_name)
+                with open(fixture_path, "r", encoding="utf-8") as fixture:
+                    fixtures[fixture_path] = [
+                        Fixture(**fixture) for fixture in json.load(fixture)
+                    ]
+
+        self.write_pks_per_model(fixtures)
+        self.stdout.write()
+        self.write_pks_per_file(fixtures)