From 88d527d574567420d7aa72f37205bd6b345b8dd7 Mon Sep 17 00:00:00 2001
From: Melody Horn / boringcactus <melody@boringcactus.com>
Date: Sat, 19 Jun 2021 23:10:53 -0600
Subject: generate diesel::table! in derive(Model)

---
 tosin-macros/src/lib.rs | 50 ++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 39 insertions(+), 11 deletions(-)

(limited to 'tosin-macros/src/lib.rs')

diff --git a/tosin-macros/src/lib.rs b/tosin-macros/src/lib.rs
index 7028274..c9e352c 100644
--- a/tosin-macros/src/lib.rs
+++ b/tosin-macros/src/lib.rs
@@ -18,7 +18,9 @@ pub fn model_derive(input: TokenStream) -> TokenStream {
     impl_model(&ast)
 }
 
-fn to_field_spec(field: &syn::Field) -> impl quote::ToTokens {
+// TODO clean all this shit up
+
+fn to_field_spec(field: &syn::Field) -> (impl quote::ToTokens, impl quote::ToTokens) {
     fn parse_type(ty: &str) -> syn::Type {
         syn::parse_str(ty).unwrap()
     }
@@ -39,24 +41,42 @@ fn to_field_spec(field: &syn::Field) -> impl quote::ToTokens {
         })
         .collect();
     if field_type == &parse_type("Option<Id>") {
-        quote! { ::tosin::db::models::Field::IntField { name: stringify!(#field_name) } }
+        ( 
+            quote! { ::tosin::db::models::Field::IntField { name: stringify!(#field_name) } },
+            quote! { #field_name -> Integer }
+        )
     } else if field_type == &parse_type("Id") {
         // TODO foreign key constraint
-        quote! { ::tosin::db::models::Field::IntField { name: stringify!(#field_name) } }
+        ( 
+            quote! { ::tosin::db::models::Field::IntField { name: stringify!(#field_name) } },
+            quote! { #field_name -> Integer }
+        )
     } else if field_type == &parse_type("usize") {
         // TODO default
-        quote! { ::tosin::db::models::Field::IntField { name: stringify!(#field_name) } }
+        ( 
+            quote! { ::tosin::db::models::Field::IntField { name: stringify!(#field_name) } },
+            quote! { #field_name -> Integer }
+        )
     } else if field_type == &parse_type("String") {
         let max_length = model_options.iter()
             .find(|(name, _value)| name.get_ident().map_or(false, |path| path == "max_length"))
             .map(|(_name, value)| value);
         if let Some(max_length) = max_length {
-            quote! { ::tosin::db::models::Field::CharField { name: stringify!(#field_name), max_length: Some(#max_length) } }
+            (
+                quote! { ::tosin::db::models::Field::CharField { name: stringify!(#field_name), max_length: Some(#max_length) } },
+                quote! { #field_name -> Text }
+            )
         } else {
-            quote! { ::tosin::db::models::Field::CharField { name: stringify!(#field_name), max_length: None } }
+            (
+                quote! { ::tosin::db::models::Field::CharField { name: stringify!(#field_name), max_length: None } },
+                quote! { #field_name -> Text }
+            )
         }
     } else if field_type == &parse_type("time::PrimitiveDateTime") {
-        quote! { ::tosin::db::models::Field::DateTimeField { name: stringify!(#field_name) } }
+        (
+            quote! { ::tosin::db::models::Field::DateTimeField { name: stringify!(#field_name) } },
+            quote! { #field_name -> Timestamp }
+        )
     } else {
         use quote::ToTokens;
         panic!("can't handle {}", field.to_token_stream())
@@ -65,19 +85,27 @@ fn to_field_spec(field: &syn::Field) -> impl quote::ToTokens {
 
 fn impl_model(ast: &syn::DeriveInput) -> TokenStream {
     let name = &ast.ident;
-    let fields = if let syn::Data::Struct(ast) = &ast.data {
-        ast.fields.iter()
-            .map(to_field_spec)
+    let lowercase_name = quote::format_ident!("{}", name.to_string().to_lowercase());
+    let ast_data = if let syn::Data::Struct(ast_data) = &ast.data {
+        ast_data
     } else {
         panic!("not on a struct");
     };
+    let (tosin_fields, diesel_columns): (Vec<_>, Vec<_>) = ast_data.fields.iter().map(to_field_spec).unzip();
     let gen = quote! {
         impl #name {
             pub const META: ::tosin::db::models::ModelMeta = ::tosin::db::models::ModelMeta {
                 name: stringify!(#name),
-                fields: &[ #(#fields),* ],
+                fields: &[ #(#tosin_fields),* ],
             };
         }
+
+        // this means users need #[macro_use] extern crate diesel; but fuck doing it ourselves
+        table! {
+            #lowercase_name {
+                #(#diesel_columns,)*
+            }
+        }
     };
     gen.into()
 }
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