You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: identifiable.rs
    path of file: ./repos/diesel/diesel_derives/src
    
    the code of the file until where you have to start completion: use proc_macro2::TokenStream;
use quote::quote;
use syn::parse_quote;
use syn::DeriveInput;
use syn::Result;

use crate::model::Model;
use crate::util::wrap_in_dummy_mod;

pub fn derive(item: DeriveInput) -> Result<TokenStream> {
    let model = Model::from_item(&item, false, false)?;

    let struct_name = &item.ident;
    let table_name = &model.table_names()[0];

    let (impl_generics, ty_generics, where_clause) = item.generics.split_for_impl();
    let mut ref_generics = item.generics.clone();
    ref_generics.params.push(parse_quote!('ident));
    let (ref_generics, ..) = ref_generics.split_for_impl();

    let mut field_ty = Vec::new();
    let mut field_name = Vec::new();
    for pk in model.primary_key_names.iter() {
        let f = model.find_column(pk)?;
        field_ty.push(&f.ty);
        field_name.push(&f.name);
    }

    Ok(wrap_in_dummy_mod(quote! {
        use diesel::associations::
    
pub fn derive(item: DeriveInput) -> Result<TokenStream> {
    let model = Model::from_item(&item, false, false)?;

    let struct_name = &item.ident;
    let table_name = &model.table_names()[0];

    let (impl_generics, ty_generics, where_clause) = item.generics.split_for_impl();
    let mut ref_generics = item.generics.clone();
    ref_generics.params.push(parse_quote!('ident));
    let (ref_generics, ..) = ref_generics.split_for_impl();

    let mut field_ty = Vec::new();
    let mut field_name = Vec::new();
    for pk in model.primary_key_names.iter() {
        let f = model.find_column(pk)?;
        field_ty.push(&f.ty);
        field_name.push(&f.name);
    }

    Ok(wrap_in_dummy_mod(quote! {
        use diesel::associations::{HasTable, Identifiable};

        impl #impl_generics HasTable for #struct_name #ty_generics
        #where_clause
        {
            type Table = #table_name::table;

            fn table() -> Self::Table {
                #table_name::table
            }
        }

        impl #ref_generics Identifiable for &'ident #struct_name #ty_generics
        #where_clause
        {
            type Id = (#(&'ident #field_ty),*);

            fn id(self) -> Self::Id {
                (#(&self.#field_name),*)
            }
        }

        impl #ref_generics Identifiable for &'_ &'ident #struct_name #ty_generics
            #where_clause
        {
            type Id = (#(&'ident #field_ty),*);

            fn id(self) -> Self::Id {
                (#(&self.#field_name),*)
            }
        }
    }))
}