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// This Source Code Form is subject to the terms of the Mozilla Public | ||
// License, v. 2.0. If a copy of the MPL was not distributed with this | ||
// file, You can obtain one at https://mozilla.org/MPL/2.0/. | ||
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//! CTE utility for iterating over all columns in a table. | ||
use diesel::prelude::*; | ||
use std::marker::PhantomData; | ||
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/// Used to iterate over a tuple of columns ("T"). | ||
/// | ||
/// Diesel exposes "AllColumns" as a tuple, which is difficult to iterate over | ||
/// -- after all, all the types are distinct. However, each of these types | ||
/// implements "Column", so we can use a macro to provide a | ||
/// "convertion-to-iterator" implemenation for our expected tuples. | ||
pub(crate) struct ColumnWalker<T> { | ||
remaining: PhantomData<T>, | ||
} | ||
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impl<T> ColumnWalker<T> { | ||
pub fn new() -> Self { | ||
Self { remaining: PhantomData } | ||
} | ||
} | ||
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macro_rules! impl_column_walker { | ||
( $len:literal $($column:ident)+ ) => ( | ||
impl<$($column: Column),+> IntoIterator for ColumnWalker<($($column,)+)> { | ||
type Item = &'static str; | ||
type IntoIter = std::array::IntoIter<Self::Item, $len>; | ||
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fn into_iter(self) -> Self::IntoIter { | ||
[$($column::NAME,)+].into_iter() | ||
} | ||
} | ||
); | ||
} | ||
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// implementations for 1 - 32 columns | ||
impl_column_walker! { 1 A } | ||
impl_column_walker! { 2 A B } | ||
impl_column_walker! { 3 A B C } | ||
impl_column_walker! { 4 A B C D } | ||
impl_column_walker! { 5 A B C D E } | ||
impl_column_walker! { 6 A B C D E F } | ||
impl_column_walker! { 7 A B C D E F G } | ||
impl_column_walker! { 8 A B C D E F G H } | ||
impl_column_walker! { 9 A B C D E F G H I } | ||
impl_column_walker! { 10 A B C D E F G H I J } | ||
impl_column_walker! { 11 A B C D E F G H I J K } | ||
impl_column_walker! { 12 A B C D E F G H I J K L } | ||
impl_column_walker! { 13 A B C D E F G H I J K L M } | ||
impl_column_walker! { 14 A B C D E F G H I J K L M N } | ||
impl_column_walker! { 15 A B C D E F G H I J K L M N O } | ||
impl_column_walker! { 16 A B C D E F G H I J K L M N O P } | ||
impl_column_walker! { 17 A B C D E F G H I J K L M N O P Q } | ||
impl_column_walker! { 18 A B C D E F G H I J K L M N O P Q R } | ||
impl_column_walker! { 19 A B C D E F G H I J K L M N O P Q R S } | ||
impl_column_walker! { 20 A B C D E F G H I J K L M N O P Q R S T } | ||
impl_column_walker! { 21 A B C D E F G H I J K L M N O P Q R S T U } | ||
impl_column_walker! { 22 A B C D E F G H I J K L M N O P Q R S T U V } | ||
impl_column_walker! { 23 A B C D E F G H I J K L M N O P Q R S T U V W } | ||
impl_column_walker! { 24 A B C D E F G H I J K L M N O P Q R S T U V W X } | ||
impl_column_walker! { 25 A B C D E F G H I J K L M N O P Q R S T U V W X Y } | ||
impl_column_walker! { 26 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z } | ||
impl_column_walker! { 27 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A1 } | ||
impl_column_walker! { 28 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A1 B1 } | ||
impl_column_walker! { 29 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A1 B1 C1 } | ||
impl_column_walker! { 30 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A1 B1 C1 D1 } | ||
impl_column_walker! { 31 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A1 B1 C1 D1 E1 } | ||
impl_column_walker! { 32 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A1 B1 C1 D1 E1 F1 } | ||
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#[cfg(test)] | ||
mod test { | ||
use super::*; | ||
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table! { | ||
test_schema.test_table (id) { | ||
id -> Uuid, | ||
value -> Int4, | ||
time_deleted -> Nullable<Timestamptz>, | ||
} | ||
} | ||
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// We can convert all a tables columns into an iteratable format. | ||
#[test] | ||
fn test_walk_table() { | ||
let all_columns = | ||
ColumnWalker::<<test_table::table as Table>::AllColumns>::new(); | ||
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let mut iter = all_columns.into_iter(); | ||
assert_eq!(iter.next(), Some("id")); | ||
assert_eq!(iter.next(), Some("value")); | ||
assert_eq!(iter.next(), Some("time_deleted")); | ||
assert_eq!(iter.next(), None); | ||
} | ||
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// We can, if we want to, also make a ColumnWalker out of an arbitrary tuple | ||
// of columns. | ||
#[test] | ||
fn test_walk_columns() { | ||
let all_columns = ColumnWalker::<( | ||
test_table::columns::id, | ||
test_table::columns::value, | ||
)>::new(); | ||
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let mut iter = all_columns.into_iter(); | ||
assert_eq!(iter.next(), Some("id")); | ||
assert_eq!(iter.next(), Some("value")); | ||
assert_eq!(iter.next(), None); | ||
} | ||
} |
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