mirror of https://github.com/LemmyNet/lemmy.git
Move WithoutId to lib.rs
dullbananas
GitHub
parent
c60611b5a8
commit
0c23e5213b
|
|
@ -29,9 +29,72 @@ extern crate macro_rules_attribute;
|
||||||
extern crate paste;
|
extern crate paste;
|
||||||
|
|
||||||
#[cfg(feature = "full")]
|
#[cfg(feature = "full")]
|
||||||
#[allow(unused_imports)]
|
/// `macro_rules_attribute::derive(WithoutId!)` generates a variant of the struct with
|
||||||
#[macro_use]
|
/// `WithoutId` added to the name and no `id` field.
|
||||||
mod without_id;
|
///
|
||||||
|
/// This is useful for making less redundant selections of multiple joined tables.
|
||||||
|
/// For example, selecting both `comment::post_id` and `post::id` is redundant if they
|
||||||
|
/// have the same value. In this case, the selection of `post::id` can be avoided by selecting
|
||||||
|
/// `PostWithoutId::as_select()` instead of `post::all_columns`.
|
||||||
|
///
|
||||||
|
/// This macro generates an `into_full` method, which converts to the sturct with `id`.
|
||||||
|
/// For example, `PostWithoutId` would have this:
|
||||||
|
///
|
||||||
|
/// `pub fn into_full(self, id: PostId) -> Post`
|
||||||
|
///
|
||||||
|
/// The `id` value can come from a column in another table, like `comment::post_id`.
|
||||||
|
///
|
||||||
|
/// The generated struct implements `Selectable` and `Queryable`.
|
||||||
|
macro_rules! WithoutId {
|
||||||
|
(
|
||||||
|
#[diesel(table_name = $table_name:ident)]
|
||||||
|
$(#[$_struct_meta:meta])*
|
||||||
|
$vis:vis struct $struct_name:ident {
|
||||||
|
$(#[$_id_meta:meta])*
|
||||||
|
$_id_vis:vis id: $id_type:ty,
|
||||||
|
$(
|
||||||
|
// TODO: more flexible and clean attribute matching
|
||||||
|
$(#[doc = $_doc1:tt])*
|
||||||
|
$(#[cfg($($cfgtt:tt)*)])*
|
||||||
|
$(#[cfg_attr($($cfgattrtt:tt)*)] $(#[doc = $_doc2:tt])*)*
|
||||||
|
$(#[serde($($serdett:tt)*)])*
|
||||||
|
$field_vis:vis $field_name:ident : $field_type:ty,
|
||||||
|
)*
|
||||||
|
}
|
||||||
|
) => {
|
||||||
|
::paste::paste! {
|
||||||
|
#[derive(::diesel::Queryable, ::diesel::Selectable)]
|
||||||
|
#[diesel(table_name = $table_name)]
|
||||||
|
$vis struct [<$struct_name WithoutId>] {
|
||||||
|
$(
|
||||||
|
$(#[cfg($($cfgtt)*)])*
|
||||||
|
$field_vis $field_name : $field_type,
|
||||||
|
)*
|
||||||
|
}
|
||||||
|
|
||||||
|
impl [<$struct_name WithoutId>] {
|
||||||
|
pub fn into_full(self, id: $id_type) -> $struct_name {
|
||||||
|
$struct_name {
|
||||||
|
id,
|
||||||
|
$($(#[cfg($($cfgtt)*)])* $field_name : self.$field_name,)*
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
};
|
||||||
|
|
||||||
|
// Keep on removing the first attribute until `diesel(table_name = ...)` becomes
|
||||||
|
// the first, which will cause the first pattern to be matched.
|
||||||
|
(#[$_meta:meta] $($remaining:tt)*) => {
|
||||||
|
WithoutId!($($remaining)*);
|
||||||
|
};
|
||||||
|
|
||||||
|
// This pattern is matched when there's no attributes.
|
||||||
|
($_vis:vis struct $($_tt:tt)*) => {
|
||||||
|
::std::compile_error!("`#[diesel(table_name = ...)]` is missing");
|
||||||
|
};
|
||||||
|
}
|
||||||
|
|
||||||
pub mod aggregates;
|
pub mod aggregates;
|
||||||
#[cfg(feature = "full")]
|
#[cfg(feature = "full")]
|
||||||
pub mod impls;
|
pub mod impls;
|
||||||
|
|
|
||||||
|
|
@ -1,65 +0,0 @@
|
||||||
/// `macro_rules_attribute::derive(WithoutId!)` generates a variant of the struct with
|
|
||||||
/// `WithoutId` added to the name and no `id` field.
|
|
||||||
///
|
|
||||||
/// This is useful for making less redundant selections of multiple joined tables.
|
|
||||||
/// For example, selecting both `comment::post_id` and `post::id` is redundant if they
|
|
||||||
/// have the same value. In this case, the selection of `post::id` can be avoided by selecting
|
|
||||||
/// `PostWithoutId::as_select()` instead of `post::all_columns`.
|
|
||||||
///
|
|
||||||
/// This macro generates an `into_full` method, which converts to the sturct with `id`.
|
|
||||||
/// For example, `PostWithoutId` would have this:
|
|
||||||
///
|
|
||||||
/// `pub fn into_full(self, id: PostId) -> Post`
|
|
||||||
///
|
|
||||||
/// The `id` value can come from a column in another table, like `comment::post_id`.
|
|
||||||
///
|
|
||||||
/// The generated struct implements `Selectable` and `Queryable`.
|
|
||||||
macro_rules! WithoutId {
|
|
||||||
(
|
|
||||||
#[diesel(table_name = $table_name:ident)]
|
|
||||||
$(#[$_struct_meta:meta])*
|
|
||||||
$vis:vis struct $struct_name:ident {
|
|
||||||
$(#[$_id_meta:meta])*
|
|
||||||
$_id_vis:vis id: $id_type:ty,
|
|
||||||
$(
|
|
||||||
// TODO: more flexible and clean attribute matching
|
|
||||||
$(#[doc = $_doc1:tt])*
|
|
||||||
$(#[cfg($($cfgtt:tt)*)])*
|
|
||||||
$(#[cfg_attr($($cfgattrtt:tt)*)] $(#[doc = $_doc2:tt])*)*
|
|
||||||
$(#[serde($($serdett:tt)*)])*
|
|
||||||
$field_vis:vis $field_name:ident : $field_type:ty,
|
|
||||||
)*
|
|
||||||
}
|
|
||||||
) => {
|
|
||||||
::paste::paste! {
|
|
||||||
#[derive(::diesel::Queryable, ::diesel::Selectable)]
|
|
||||||
#[diesel(table_name = $table_name)]
|
|
||||||
$vis struct [<$struct_name WithoutId>] {
|
|
||||||
$(
|
|
||||||
$(#[cfg($($cfgtt)*)])*
|
|
||||||
$field_vis $field_name : $field_type,
|
|
||||||
)*
|
|
||||||
}
|
|
||||||
|
|
||||||
impl [<$struct_name WithoutId>] {
|
|
||||||
pub fn into_full(self, id: $id_type) -> $struct_name {
|
|
||||||
$struct_name {
|
|
||||||
id,
|
|
||||||
$($(#[cfg($($cfgtt)*)])* $field_name : self.$field_name,)*
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
};
|
|
||||||
|
|
||||||
// Keep on removing the first attribute until `diesel(table_name = ...)` becomes
|
|
||||||
// the first, which will cause the first pattern to be matched.
|
|
||||||
(#[$_meta:meta] $($remaining:tt)*) => {
|
|
||||||
WithoutId!($($remaining)*);
|
|
||||||
};
|
|
||||||
|
|
||||||
// This pattern is matched when there's no attributes.
|
|
||||||
($_vis:vis struct $($_tt:tt)*) => {
|
|
||||||
::std::compile_error!("`#[diesel(table_name = ...)]` is missing");
|
|
||||||
};
|
|
||||||
}
|
|
||||||
Loading…
Reference in New Issue