install report: use array instead of dict for install field

docs/html/reference/installation-report.md

@@ -18,14 +18,17 @@ The report is a JSON object with the following properties:
   the corresponding version.
 
 - `pip_version`: a string with the version of pip used to produce the report.
-- `install`: an object where the properties are the canonicalized names of the
-  distribution packages (to be) installed and the values are of type
-  `InstallationReportItem` (see below).
+
+- `install`: an array of [InstallationReportItem](InstallationReportItem) representing
+  the distribution packages (to be) installed.
+
 - `environment`: an object describing the environment where the installation report was
   generated. See [PEP 508 environment
   markers](https://peps.python.org/pep-0508/#environment-markers) for more information.
   Values have a string type.
 
+(InstallationReportItem)=
+
 An `InstallationReportItem` is an object describing a (to be) installed distribution
 package with the following properties:
 
@@ -75,8 +78,8 @@ will produce an output similar to this (metadata abriged for brevity):
 {
   "version": "0",
   "pip_version": "22.2",
-  "install": {
-    "pydantic": {
+  "install": [
+    {
       "download_info": {
         "url": "https://files.pythonhosted.org/packages/a4/0c/fbaa7319dcb5eecd3484686eb5a5c5702a6445adb566f01aee6de3369bc4/pydantic-1.9.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl",
         "archive_info": {
@@ -101,7 +104,7 @@ will produce an output similar to this (metadata abriged for brevity):
         ]
       }
     },
-    "packaging": {
+    {
       "download_info": {
         "url": "https://github.com/pypa/packaging",
         "vcs_info": {
@@ -121,7 +124,7 @@ will produce an output similar to this (metadata abriged for brevity):
         "requires_python": ">=3.7"
       }
     },
-    "pyparsing": {
+    {
       "download_info": {
         "url": "https://files.pythonhosted.org/packages/6c/10/a7d0fa5baea8fe7b50f448ab742f26f52b80bfca85ac2be9d35cdd9a3246/pyparsing-3.0.9-py3-none-any.whl",
         "archive_info": {
@@ -140,7 +143,7 @@ will produce an output similar to this (metadata abriged for brevity):
         "requires_python": ">=3.6.8"
       }
     },
-    "typing-extensions": {
+    {
       "download_info": {
         "url": "https://files.pythonhosted.org/packages/75/e1/932e06004039dd670c9d5e1df0cd606bf46e29a28e65d5bb28e894ea29c9/typing_extensions-4.2.0-py3-none-any.whl",
         "archive_info": {
@@ -155,7 +158,7 @@ will produce an output similar to this (metadata abriged for brevity):
         "requires_python": ">=3.7"
       }
     }
-  },
+  ],
   "environment": {
     "implementation_name": "cpython",
     "implementation_version": "3.10.5",

src/pip/_internal/models/installation_report.py

@@ -1,7 +1,6 @@
 from typing import Any, Dict, Sequence
 
 from pip._vendor.packaging.markers import default_environment
-from pip._vendor.packaging.utils import canonicalize_name
 
 from pip import __version__
 from pip._internal.req.req_install import InstallRequirement
@@ -41,12 +40,9 @@ class InstallationReport:
         return {
             "version": "0",
             "pip_version": __version__,
-            "install": {
-                canonicalize_name(ireq.metadata["Name"]): self._install_req_to_dict(
-                    ireq
-                )
-                for ireq in self._install_requirements
-            },
+            "install": [
+                self._install_req_to_dict(ireq) for ireq in self._install_requirements
+            ],
             # https://peps.python.org/pep-0508/#environment-markers
             # TODO: currently, the resolver uses the default environment to evaluate
             # environment markers, so that is what we report here. In the future, it

tests/functional/test_install_report.py

@@ -1,11 +1,17 @@
 import json
 from pathlib import Path
+from typing import Any, Dict
 
 import pytest
+from packaging.utils import canonicalize_name
 
 from ..lib import PipTestEnvironment, TestData
 
 
+def _install_dict(report: Dict[str, Any]) -> Dict[str, Any]:
+    return {canonicalize_name(i["metadata"]["name"]): i for i in report["install"]}
+
+
 @pytest.mark.usefixtures("with_wheel")
 def test_install_report_basic(
     script: PipTestEnvironment, shared_data: TestData, tmp_path: Path
@@ -24,8 +30,7 @@ def test_install_report_basic(
     report = json.loads(report_path.read_text())
     assert "install" in report
     assert len(report["install"]) == 1
-    assert "simplewheel" in report["install"]
-    simplewheel_report = report["install"]["simplewheel"]
+    simplewheel_report = _install_dict(report)["simplewheel"]
     assert simplewheel_report["metadata"]["name"] == "simplewheel"
     assert simplewheel_report["requested"] is True
     assert simplewheel_report["is_direct"] is False
@@ -56,8 +61,8 @@ def test_install_report_dep(
     )
     report = json.loads(report_path.read_text())
     assert len(report["install"]) == 2
-    assert report["install"]["require-simple"]["requested"] is True
-    assert report["install"]["simple"]["requested"] is False
+    assert _install_dict(report)["require-simple"]["requested"] is True
+    assert _install_dict(report)["simple"]["requested"] is False
 
 
 @pytest.mark.network
@@ -74,9 +79,10 @@ def test_install_report_index(script: PipTestEnvironment, tmp_path: Path) -> Non
     )
     report = json.loads(report_path.read_text())
     assert len(report["install"]) == 2
-    assert report["install"]["paste"]["requested"] is True
-    assert report["install"]["python-openid"]["requested"] is False
-    paste_report = report["install"]["paste"]
+    install_dict = _install_dict(report)
+    assert install_dict["paste"]["requested"] is True
+    assert install_dict["python-openid"]["requested"] is False
+    paste_report = install_dict["paste"]
     assert paste_report["download_info"]["url"].startswith(
         "https://files.pythonhosted.org/"
     )
@@ -108,7 +114,7 @@ def test_install_report_vcs_and_wheel_cache(
     )
     report = json.loads(report_path.read_text())
     assert len(report["install"]) == 1
-    pip_test_package_report = report["install"]["pip-test-package"]
+    pip_test_package_report = report["install"][0]
     assert pip_test_package_report["is_direct"] is True
     assert pip_test_package_report["requested"] is True
     assert (
@@ -136,7 +142,7 @@ def test_install_report_vcs_and_wheel_cache(
     assert "Using cached pip_test_package" in result.stdout
     report = json.loads(report_path.read_text())
     assert len(report["install"]) == 1
-    pip_test_package_report = report["install"]["pip-test-package"]
+    pip_test_package_report = report["install"][0]
     assert pip_test_package_report["is_direct"] is True
     assert pip_test_package_report["requested"] is True
     assert (
@@ -168,7 +174,7 @@ def test_install_report_vcs_editable(
     )
     report = json.loads(report_path.read_text())
     assert len(report["install"]) == 1
-    pip_test_package_report = report["install"]["pip-test-package"]
+    pip_test_package_report = report["install"][0]
     assert pip_test_package_report["is_direct"] is True
     assert pip_test_package_report["download_info"]["url"].startswith("file://")
     assert pip_test_package_report["download_info"]["url"].endswith(