benzina-derive 0.5.2

Various helper types and macros for `diesel`
Documentation 
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use proc_macro2::TokenStream;
use quote::{ToTokens, quote};

pub(super) struct NewIndexMap;

impl ToTokens for NewIndexMap {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        tokens.extend(quote! {
            ::benzina::__private::new_indexmap::<_, _>()
        });
    }
}

pub(super) struct Identifiable<T> {
    pub(super) table: T,
}

impl<T: ToTokens> ToTokens for Identifiable<T> {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        let Self { table } = self;
        tokens.extend(quote! {
            ::benzina::__private::deep_clone::DeepClone::deep_clone(
                &(<_ as ::benzina::__private::diesel::associations::Identifiable>::id(&#table),)
            )
        });
    }
}

pub(super) fn tuple_from_tokenizables<I>(tokenizables: I) -> TokenStream
where
    I: IntoIterator<Item: ToTokens, IntoIter: ExactSizeIterator>,
{
    let tokenizables = tokenizables.into_iter();
    if tokenizables.len() == 0 {
        quote! { () }
    } else {
        quote! { (#(#tokenizables),*,) }
    }
}