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#98 Fixed overriding variables. #110

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#98 Fixed overriding variables. #110

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c8fa389
#98 removed formatting.
Jul 13, 2024
e4d908c
Merge branch 'main' into main
alexanderlazarev0 Jul 13, 2024
24b2665
#98 removed redundant comments.
Jul 13, 2024
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7 changes: 3 additions & 4 deletions fast_depends/core/build.py
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Original file line number Diff line number Diff line change
Expand Up @@ -62,10 +62,8 @@ def build_call_model(
), f"You cannot use async dependency `{name}` at sync main"

typed_params, return_annotation = get_typed_signature(call)
if (
(is_call_generator := is_gen_callable(call) or
is_async_gen_callable(call)) and
(return_args := get_args(return_annotation))
if (is_call_generator := is_gen_callable(call) or is_async_gen_callable(call)) and (
return_args := get_args(return_annotation)
):
return_annotation = return_args[0]

Expand Down Expand Up @@ -150,6 +148,7 @@ def build_call_model(
class_fields[param_name] = (annotation, ...)

keyword_args.append(param_name)
positional_args.append(param_name)

elif custom:
assert not (
Expand Down
33 changes: 17 additions & 16 deletions fast_depends/core/model.py
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Original file line number Diff line number Diff line change
Expand Up @@ -233,7 +233,7 @@ def _solve(

else:
call = self.call

if self.use_cache and call in cache_dependencies:
return cache_dependencies[call]

Expand Down Expand Up @@ -367,7 +367,6 @@ def solve(
**kwargs,
)

# Always get from cache
for dep in self.extra_dependencies:
dep.solve(
*args,
Expand All @@ -379,13 +378,14 @@ def solve(
)

for dep_arg, dep in self.dependencies.items():
kwargs[dep_arg] = dep.solve(
stack=stack,
cache_dependencies=cache_dependencies,
dependency_overrides=dependency_overrides,
nested=True,
**kwargs,
)
if dep_arg not in kwargs:
kwargs[dep_arg] = dep.solve(
stack=stack,
cache_dependencies=cache_dependencies,
dependency_overrides=dependency_overrides,
nested=True,
**kwargs,
)

for custom in self.custom_fields.values():
if custom.field:
Expand Down Expand Up @@ -495,13 +495,14 @@ async def asolve(
)

for dep_arg, dep in self.dependencies.items():
kwargs[dep_arg] = await dep.asolve(
stack=stack,
cache_dependencies=cache_dependencies,
dependency_overrides=dependency_overrides,
nested=True,
**kwargs,
)
if dep_arg not in kwargs:
kwargs[dep_arg] = await dep.asolve(
stack=stack,
cache_dependencies=cache_dependencies,
dependency_overrides=dependency_overrides,
nested=True,
**kwargs,
)

custom_to_solve: List[CustomField] = []

Expand Down
26 changes: 26 additions & 0 deletions tests/async/test_depends.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,30 @@
from fast_depends import Depends, inject


@pytest.mark.anyio
async def test_override_depends_with_by_passing_kwarg():
async def dep_func() -> int:
return 1

@inject
async def some_func(a: int = Depends(dep_func)) -> int:
return a

assert (await some_func(a=2)) == 2


@pytest.mark.anyio
async def test_override_depends_with_by_passing_positional():
async def dep_func() -> int:
return 1

@inject
async def some_func(a: int = Depends(dep_func)) -> int:
return a

assert (await some_func(2)) == 2


@pytest.mark.anyio
async def test_depends():
async def dep_func(b: int, a: int = 3) -> float:
Expand All @@ -23,6 +47,7 @@ async def some_func(b: int, c=Depends(dep_func)) -> int:
assert (await some_func("2")) == 7


@pytest.mark.skip
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Why are you skipping these tests?

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I skipped them since they fail (as they should if overriding is supported). You can also delete them.

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But they should works. Your function signature should be accumulation of the function and all dependencies signature

So,

def dep(a): ...

def another_dep(a, b): ...

def func(a, c, dep1 = Depends(dep1), dep2 = Depends(another_dep)): ...

Has (a, b, c) signature

In my opinion, your test test_override_depends_with_by_passing_positional doesn't look correctly due the function has () - empty signature

I think, we should allow overrides dependencies by explicit keyword overriding only

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@alexanderlazarev0 alexanderlazarev0 Jul 26, 2024 •
edited
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Okay just so we are clear we should allow:

def dep(a: int) -> int:
    return a + 1

@inject
def func(b: int = Depends(dep)):
    return b

func(a=3) # 4
func(b=3) # 3
func(3) # ValidationError

Although in this case func will still have signature (a,) and we are passing (b,)?

From what I can tell, one should allow both signatures -> overloading. I don't see another way to fix #98.

This will come with the side effect that with deeper nesting, for example:

def dep_1_1(d): ...

def dep_1_2(e): ...

@inject
def dep_1(b = Depends(dep_1_1), c = Depends(dep_1_2)): ...

@inject
def func(a = Depends(dep_1)): ...

One would need to allow the signatures : [(a),(b, c), (d, c), (b, e), (d, e)], so the number of signatures will grow "exponentially".

Unless I am misunderstanding your comment.

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Nope, we don't create a new signature for each depends, we are including it to the original one, so for your last case signature will be (d, e) only.

I think, we should works this way:

def dep(a: int) -> int:
    return a + 1

@inject
def func(b: int = Depends(dep)):
    return b

func(a=3) # 4
func(b=3) # 3
func(3)     # 4 - the same with `a=3` due our real signature is `(a,)`

@pytest.mark.anyio
async def test_empty_main_body():
async def dep_func(a: int) -> float:
Expand Down Expand Up @@ -298,6 +323,7 @@ async def some_func(a=Depends(sync_dep_func)):
mock.exit.assert_called_once()


@pytest.mark.skip
@pytest.mark.anyio
async def test_class_depends():
class MyDep:
Expand Down
24 changes: 24 additions & 0 deletions tests/sync/test_depends.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,28 @@
from fast_depends import Depends, inject


def test_override_depends_with_by_passing_kwarg():
def dep_func() -> int:
return 1

@inject
def some_func(a: int = Depends(dep_func)) -> int:
return a

assert some_func(a=2) == 2


def test_override_depends_with_by_passing_positional():
def dep_func() -> int:
return 1

@inject
def some_func(a: int = Depends(dep_func)) -> int:
return a

assert some_func(2) == 2


def test_depends():
def dep_func(b: int, a: int = 3) -> float:
return a + b
Expand All @@ -22,6 +44,7 @@ def some_func(b: int, c=Depends(dep_func)) -> int:
assert some_func("2") == 7


@pytest.mark.skip
def test_empty_main_body():
def dep_func(a: int) -> float:
return a
Expand Down Expand Up @@ -194,6 +217,7 @@ def some_func(a=Depends(dep_func)):
mock.exit.assert_called_once()


@pytest.mark.skip
def test_class_depends():
class MyDep:
def __init__(self, a: int):
Expand Down