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Impl TryGetableMany for diffrent types of generices #175

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merged 3 commits into from
Sep 18, 2021
Merged

Impl TryGetableMany for diffrent types of generices #175

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56dd19e
Impl TryGetableMany for diffrent types of generices
MuhannadAlrusayni Sep 17, 2021
3bf26a7
impl `TryFromU64` for tuples types
MuhannadAlrusayni Sep 17, 2021
15db5d2
clean up some comments
MuhannadAlrusayni Sep 17, 2021
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73 changes: 48 additions & 25 deletions src/executor/query.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -314,29 +314,50 @@ where
}
}

impl<T> TryGetableMany for (T, T)
impl<A, B> TryGetableMany for (A, B)
where
T: TryGetable,
A: TryGetable,
B: TryGetable,
{
fn try_get_many(res: &QueryResult, pre: &str, cols: &[String]) -> Result<Self, TryGetError> {
try_get_many_with_slice_len_of(2, cols)?;
Ok((
T::try_get(res, pre, &cols[0])?,
T::try_get(res, pre, &cols[1])?,
A::try_get(res, pre, &cols[0])?,
B::try_get(res, pre, &cols[1])?,
))
}
}

impl<T> TryGetableMany for (T, T, T)
impl<A, B, C> TryGetableMany for (A, B, C)
where
T: TryGetable,
A: TryGetable,
B: TryGetable,
C: TryGetable,
{
fn try_get_many(res: &QueryResult, pre: &str, cols: &[String]) -> Result<Self, TryGetError> {
try_get_many_with_slice_len_of(3, cols)?;
Ok((
T::try_get(res, pre, &cols[0])?,
T::try_get(res, pre, &cols[1])?,
T::try_get(res, pre, &cols[2])?,
A::try_get(res, pre, &cols[0])?,
B::try_get(res, pre, &cols[1])?,
C::try_get(res, pre, &cols[2])?,
))
}
}

impl<A, B, C, D> TryGetableMany for (A, B, C, D)
where
A: TryGetable,
B: TryGetable,
C: TryGetable,
D: TryGetable,
{
fn try_get_many(res: &QueryResult, pre: &str, cols: &[String]) -> Result<Self, TryGetError> {
try_get_many_with_slice_len_of(4, cols)?;
Ok((
A::try_get(res, pre, &cols[0])?,
B::try_get(res, pre, &cols[1])?,
C::try_get(res, pre, &cols[2])?,
D::try_get(res, pre, &cols[3])?,
))
}
}
Expand Down Expand Up @@ -370,15 +391,27 @@ macro_rules! try_from_u64_err {
}
}
};
}

macro_rules! try_from_u64_tuple {
( $type: ty ) => {
try_from_u64_err!(($type, $type));
try_from_u64_err!(($type, $type, $type));
( $($gen_type: ident),* ) => {
impl<$( $gen_type, )*> TryFromU64 for ($( $gen_type, )*)
where
$( $gen_type: TryFromU64, )*
{
fn try_from_u64(_: u64) -> Result<Self, DbErr> {
Err(DbErr::Exec(format!(
"{} cannot be converted from u64",
stringify!(($($gen_type,)*))
)))
}
}
};
}

// impl TryFromU64 for tuples with generic types
try_from_u64_err!(A, B);
try_from_u64_err!(A, B, C);
try_from_u64_err!(A, B, C, D);

macro_rules! try_from_u64_numeric {
( $type: ty ) => {
impl TryFromU64 for $type {
Expand All @@ -393,7 +426,6 @@ macro_rules! try_from_u64_numeric {
})
}
}
try_from_u64_tuple!($type);
};
}

Expand All @@ -413,19 +445,10 @@ macro_rules! try_from_u64_string {
Ok(n.to_string())
}
}
try_from_u64_tuple!($type);
};
}

try_from_u64_string!(String);

macro_rules! try_from_u64_dummy {
( $type: ty ) => {
try_from_u64_err!($type);
try_from_u64_err!(($type, $type));
try_from_u64_err!(($type, $type, $type));
};
}

#[cfg(feature = "with-uuid")]
try_from_u64_dummy!(uuid::Uuid);
try_from_u64_err!(uuid::Uuid);