59 lines
1.7 KiB
Rust
59 lines
1.7 KiB
Rust
use heck::SnakeCase;
|
|
use proc_macro2::{Ident, TokenStream};
|
|
use quote::{quote, quote_spanned};
|
|
use syn::{Data, DataEnum, Fields, Variant};
|
|
|
|
pub fn expend_derive_primary_key(ident: Ident, data: Data) -> syn::Result<TokenStream> {
|
|
let variants = match data {
|
|
syn::Data::Enum(DataEnum { variants, .. }) => variants,
|
|
_ => {
|
|
return Ok(quote_spanned! {
|
|
ident.span() => compile_error!("you can only derive DerivePrimaryKey on enums");
|
|
})
|
|
}
|
|
};
|
|
|
|
let variant: Vec<TokenStream> = variants
|
|
.iter()
|
|
.map(|Variant { ident, fields, .. }| match fields {
|
|
Fields::Named(_) => quote! { #ident{..} },
|
|
Fields::Unnamed(_) => quote! { #ident(..) },
|
|
Fields::Unit => quote! { #ident },
|
|
})
|
|
.collect();
|
|
|
|
let name: Vec<TokenStream> = variants
|
|
.iter()
|
|
.map(|v| {
|
|
let ident = v.ident.to_string().to_snake_case();
|
|
quote! { #ident }
|
|
})
|
|
.collect();
|
|
|
|
Ok(quote!(
|
|
impl sea_orm::Iden for #ident {
|
|
fn unquoted(&self, s: &mut dyn std::fmt::Write) {
|
|
write!(s, "{}", self.as_str()).unwrap();
|
|
}
|
|
}
|
|
|
|
impl sea_orm::IdenStatic for #ident {
|
|
fn as_str(&self) -> &str {
|
|
match self {
|
|
#(Self::#variant => #name),*
|
|
}
|
|
}
|
|
}
|
|
|
|
impl sea_orm::PrimaryKeyTrait for #ident {}
|
|
|
|
impl sea_orm::PrimaryKeyOfModel<Model> for #ident {
|
|
fn into_column(self) -> <Model as ModelTrait>::Column {
|
|
match self {
|
|
#(Self::#variant => Column::#variant),*
|
|
}
|
|
}
|
|
}
|
|
))
|
|
}
|