1 files changed, 85 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/python-modules/nplusone/default.nix b/nixpkgs/pkgs/development/python-modules/nplusone/default.nix
new file mode 100644
index 000000000000..5a31394c2d35
--- /dev/null
+++ b/nixpkgs/pkgs/development/python-modules/nplusone/default.nix
@@ -0,0 +1,85 @@
+{ lib
+, blinker
+, buildPythonPackage
+, django
+, fetchFromGitHub
+, flake8
+, flask-sqlalchemy
+, isPy27
+, mock
+, peewee
+, pytest-django
+, pytestCheckHook
+, six
+, sqlalchemy
+, webtest
+}:
+
+buildPythonPackage rec {
+  pname = "nplusone";
+  version = "1.0.0";
+  disabled = isPy27;
+
+  src = fetchFromGitHub {
+    owner = "jmcarp";
+    repo = "nplusone";
+    rev = "v${version}";
+    sha256 = "0qdwpvvg7dzmksz3vqkvb27n52lq5sa8i06m7idnj5xk2dgjkdxg";
+  };
+
+  propagatedBuildInputs = [
+    blinker
+    six
+  ];
+
+  nativeCheckInputs = [
+    flake8
+    flask-sqlalchemy
+    mock
+    peewee
+    pytest-django
+    pytestCheckHook
+    sqlalchemy
+    webtest
+  ];
+
+  # The tests assume the source code is in an nplusone/ directory. When using
+  # the Nix sandbox, it will be in a source/ directory instead, making the
+  # tests fail.
+  prePatch = ''
+    substituteInPlace tests/conftest.py \
+      --replace nplusone/tests/conftest source/tests/conftest
+  '';
+
+  postPatch = ''
+    substituteInPlace pytest.ini \
+      --replace "python_paths" "pythonpath" \
+      --replace "--cov nplusone --cov-report term-missing" ""
+  '';
+
+  disabledTests = [
+    # Tests are out-dated
+    "test_many_to_one"
+    "test_many_to_many"
+    "test_eager_join"
+    "test_eager_subquery"
+    "test_eager_subquery_unused"
+    "test_many_to_many_raise"
+    "test_many_to_many_whitelist_decoy"
+    "test_many_to_one_subquery"
+    "test_many_to_one_reverse_subquery"
+    "test_many_to_many_subquery"
+    "test_many_to_many_reverse_subquery"
+    "test_profile"
+  ];
+
+  pythonImportsCheck = [ "nplusone" ];
+
+  meta = with lib; {
+    description = "Detecting the n+1 queries problem in Python";
+    homepage = "https://github.com/jmcarp/nplusone";
+    maintainers = with maintainers; [ cript0nauta ];
+    license = licenses.mit;
+    broken = lib.versionAtLeast django.version "4";
+  };
+}