Clear up several mypy # type: ignores

ixmp4/core/optimization/scalar.py

@@ -8,6 +8,7 @@
 from ixmp4.data.abstract import Docs as DocsModel
 from ixmp4.data.abstract import Run
 from ixmp4.data.abstract import Scalar as ScalarModel
+from ixmp4.data.abstract import Unit as UnitModel
 
 
 class Scalar(BaseModelFacade):
@@ -38,21 +39,19 @@ def value(self, value: float):
         )
 
     @property
-    def unit(self):
+    def unit(self) -> UnitModel:
         """Associated unit."""
         return self._model.unit
 
     @unit.setter
-    def unit(self, unit: str | Unit):
-        if isinstance(unit, Unit):
-            unit = unit
-        else:
-            unit_model = self.backend.units.get(unit)
-            unit = Unit(_backend=self.backend, _model=unit_model)
+    def unit(self, value: str | Unit):
+        if isinstance(value, str):
+            unit_model = self.backend.units.get(value)
+            value = Unit(_backend=self.backend, _model=unit_model)
         self._model = self.backend.optimization.scalars.update(
             id=self._model.id,
             value=self._model.value,
-            unit_id=unit.id,
+            unit_id=value.id,
         )
 
     @property

ixmp4/data/abstract/optimization/scalar.py

@@ -6,6 +6,7 @@
 
 from .. import base
 from ..docs import DocsRepository
+from ..unit import Unit
 
 
 class Scalar(base.BaseModel, Protocol):
@@ -17,7 +18,7 @@ class Scalar(base.BaseModel, Protocol):
     """Value of the Scalar."""
     unit__id: types.Integer
     "Foreign unique integer id of a unit."
-    unit: types.Mapped
+    unit: types.Mapped[Unit]
     "Associated unit."
     run__id: types.Integer
     "Foreign unique integer id of a run."

ixmp4/data/auth/context.py

@@ -47,7 +47,7 @@
         if utils.is_joined(exc, Model):
             perms = self.tabulate_permissions()
             if perms.empty:
-                return exc.where(False)  # type: ignore
+                return exc.where(db.false())
             if access_type == "edit":
                 perms = perms.where(perms["access_type"] == "EDIT").dropna()
             # `*` is used as wildcard in permission logic, replaced by sql-wildcard `%`

ixmp4/db/__init__.py

@@ -42,6 +42,7 @@
     UniqueConstraint,
     delete,
     exists,
+    false,
     func,
     insert,
     or_,

tests/core/test_optimization_indexset.py

@@ -60,10 +60,12 @@ def test_get_indexset(self, platform: ixmp4.Platform):
 
     def test_add_data(self, platform: ixmp4.Platform):
         run = platform.runs.create("Model", "Scenario")
-        test_data = ["foo", "bar"]
+        # See https://mypy.readthedocs.io/en/stable/common_issues.html#variance for why
+        # a type hint is required here
+        test_data: list[float | int | str] = ["foo", "bar"]
         indexset_1 = run.optimization.indexsets.create("Indexset 1")
-        indexset_1.add(test_data)  # type: ignore
-        run.optimization.indexsets.create("Indexset 2").add(test_data)  # type: ignore
+        indexset_1.add(test_data)
+        run.optimization.indexsets.create("Indexset 2").add(test_data)
         indexset_2 = run.optimization.indexsets.get("Indexset 2")
 
         assert indexset_1.data == indexset_2.data

tests/core/test_optimization_scalar.py

@@ -52,9 +52,6 @@ def test_create_scalar(self, platform: ixmp4.Platform):
                 "Scalar 1", value=20, unit=unit.name
             )
 
-        with pytest.raises(TypeError):
-            _ = run.optimization.scalars.create("Scalar 2")  # type: ignore
-
         scalar_2 = run.optimization.scalars.create("Scalar 2", value=20, unit=unit)
         assert scalar_1.id != scalar_2.id
 
@@ -86,15 +83,17 @@ def test_update_scalar(self, platform: ixmp4.Platform):
             _ = run.optimization.scalars.create("Scalar", value=20, unit=unit2.name)
 
         scalar.value = 30
-        scalar.unit = "Test Unit"
+        # At the moment, mypy doesn't allow for different types in property getter and
+        # setter, see https://github.com/python/mypy/issues/3004
+        scalar.unit = "Test Unit"  # type: ignore
         # NOTE: doesn't work for some reason (but doesn't either for e.g. model.get())
         # assert scalar == run.optimization.scalars.get("Scalar")
         result = run.optimization.scalars.get("Scalar")
 
         assert scalar.id == result.id
         assert scalar.name == result.name
         assert scalar.value == result.value == 30
-        assert scalar.unit.id == result.unit.id == 1  # type: ignore
+        assert scalar.unit.id == result.unit.id == 1
 
     def test_list_scalars(self, platform: ixmp4.Platform):
         run = platform.runs.create("Model", "Scenario")

tests/core/test_optimization_table.py

@@ -43,7 +43,7 @@ def test_create_table(self, platform: ixmp4.Platform):
 
         # Test normal creation
         indexset, indexset_2 = tuple(
-            IndexSet(_backend=platform.backend, _model=model)  # type: ignore
+            IndexSet(_backend=platform.backend, _model=model)
             for model in create_indexsets_for_run(platform=platform, run_id=run.id)
         )
         table = run.optimization.tables.create(
@@ -121,7 +121,7 @@ def test_get_table(self, platform: ixmp4.Platform):
     def test_table_add_data(self, platform: ixmp4.Platform):
         run = platform.runs.create("Model", "Scenario")
         indexset, indexset_2 = tuple(
-            IndexSet(_backend=platform.backend, _model=model)  # type: ignore
+            IndexSet(_backend=platform.backend, _model=model)
             for model in create_indexsets_for_run(platform=platform, run_id=run.id)
         )
         indexset.add(data=["foo", "bar", ""])
@@ -266,7 +266,7 @@ def test_list_tables(self, platform: ixmp4.Platform):
     def test_tabulate_table(self, platform: ixmp4.Platform):
         run = platform.runs.create("Model", "Scenario")
         indexset, indexset_2 = tuple(
-            IndexSet(_backend=platform.backend, _model=model)  # type: ignore
+            IndexSet(_backend=platform.backend, _model=model)
             for model in create_indexsets_for_run(platform=platform, run_id=run.id)
         )
         table = run.optimization.tables.create(

tests/data/test_meta.py

@@ -1,3 +1,5 @@
+from typing import Literal
+
 import pandas as pd
 import pytest
 
@@ -7,7 +9,18 @@
 
 from ..utils import assert_unordered_equality
 
-TEST_ENTRIES = [
+TEST_ENTRIES: list[
+    tuple[
+        str,
+        bool | float | int | str,
+        Literal[
+            RunMetaEntry.Type.BOOL,
+            RunMetaEntry.Type.FLOAT,
+            RunMetaEntry.Type.INT,
+            RunMetaEntry.Type.STR,
+        ],
+    ]
+] = [
     ("Boolean", True, RunMetaEntry.Type.BOOL),
     ("Float", 0.2, RunMetaEntry.Type.FLOAT),
     ("Integer", 1, RunMetaEntry.Type.INT),
@@ -26,7 +39,7 @@ def test_create_get_entry(self, platform: ixmp4.Platform):
         run.set_as_default()
 
         for key, value, type in TEST_ENTRIES:
-            entry = platform.backend.meta.create(run.id, key, value)  # type:ignore
+            entry = platform.backend.meta.create(run.id, key, value)
             assert entry.key == key
             assert entry.value == value
             assert entry.type == type

tests/data/test_optimization_indexset.py

@@ -126,22 +126,24 @@ def test_tabulate_indexsets(self, platform: ixmp4.Platform):
         )
 
     def test_add_data(self, platform: ixmp4.Platform):
-        test_data = ["foo", "bar"]
+        # See https://mypy.readthedocs.io/en/stable/common_issues.html#variance for why
+        # a type hint is required here
+        test_data: list[float | int | str] = ["foo", "bar"]
         run = platform.backend.runs.create("Model", "Scenario")
         indexset_1, indexset_2 = create_indexsets_for_run(
             platform=platform, run_id=run.id
         )
         platform.backend.optimization.indexsets.add_data(
             indexset_id=indexset_1.id,
-            data=test_data,  # type: ignore
+            data=test_data,
         )
         indexset_1 = platform.backend.optimization.indexsets.get(
             run_id=run.id, name=indexset_1.name
         )
 
         platform.backend.optimization.indexsets.add_data(
             indexset_id=indexset_2.id,
-            data=test_data,  # type: ignore
+            data=test_data,
         )
 
         assert (

tests/utils.py

@@ -19,6 +19,6 @@ def create_indexsets_for_run(
     return tuple(
         platform.backend.optimization.indexsets.create(
             run_id=run_id, name=f"Indexset {i}"
-        )  # type: ignore
+        )
         for i in range(offset, offset + amount)
     )