543 lines
24 KiB
Rust
543 lines
24 KiB
Rust
use proc_macro::TokenStream;
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use quote::quote;
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use syn::ext::IdentExt;
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use syn::{Block, Error, FnArg, ImplItem, ItemImpl, Pat, ReturnType, Type, TypeReference};
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use crate::args::{self, RenameRuleExt, RenameTarget};
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use crate::output_type::OutputType;
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use crate::utils::{
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generate_default, generate_guards, generate_validator, get_cfg_attrs, get_crate_name,
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get_param_getter_ident, get_rustdoc, get_type_path_and_name, parse_graphql_attrs,
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remove_graphql_attrs, GeneratorResult,
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};
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pub fn generate(
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object_args: &args::Object,
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item_impl: &mut ItemImpl,
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) -> GeneratorResult<TokenStream> {
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let crate_name = get_crate_name(object_args.internal);
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let (self_ty, self_name) = get_type_path_and_name(item_impl.self_ty.as_ref())?;
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let generics = &item_impl.generics;
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let where_clause = &item_impl.generics.where_clause;
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let extends = object_args.extends;
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let gql_typename = object_args
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.name
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.clone()
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.unwrap_or_else(|| RenameTarget::Type.rename(self_name.clone()));
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let desc = if object_args.use_type_description {
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quote! { ::std::option::Option::Some(<Self as #crate_name::Description>::description()) }
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} else {
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get_rustdoc(&item_impl.attrs)?
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.map(|s| quote!(::std::option::Option::Some(#s)))
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.unwrap_or_else(|| quote!(::std::option::Option::None))
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};
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let mut resolvers = Vec::new();
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let mut schema_fields = Vec::new();
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let mut find_entities = Vec::new();
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let mut add_keys = Vec::new();
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let mut create_entity_types = Vec::new();
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for item in &mut item_impl.items {
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if let ImplItem::Method(method) = item {
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let method_args: args::ObjectField =
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parse_graphql_attrs(&method.attrs)?.unwrap_or_default();
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if method_args.entity {
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let cfg_attrs = get_cfg_attrs(&method.attrs);
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if method.sig.asyncness.is_none() {
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return Err(Error::new_spanned(&method, "Must be asynchronous").into());
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}
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let ty = match &method.sig.output {
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ReturnType::Type(_, ty) => OutputType::parse(ty)?,
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ReturnType::Default => {
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return Err(Error::new_spanned(&method.sig.output, "Missing type").into())
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}
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};
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let mut create_ctx = true;
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let mut args = Vec::new();
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for (idx, arg) in method.sig.inputs.iter_mut().enumerate() {
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if let FnArg::Receiver(receiver) = arg {
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if idx != 0 {
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return Err(Error::new_spanned(
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receiver,
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"The self receiver must be the first parameter.",
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)
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.into());
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}
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} else if let FnArg::Typed(pat) = arg {
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if idx == 0 {
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return Err(Error::new_spanned(
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pat,
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"The self receiver must be the first parameter.",
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)
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.into());
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}
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match (&*pat.pat, &*pat.ty) {
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(Pat::Ident(arg_ident), Type::Path(arg_ty)) => {
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args.push((
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arg_ident.clone(),
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arg_ty.clone(),
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parse_graphql_attrs::<args::Argument>(&pat.attrs)?
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.unwrap_or_default(),
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));
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remove_graphql_attrs(&mut pat.attrs);
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}
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(arg, Type::Reference(TypeReference { elem, .. })) => {
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if let Type::Path(path) = elem.as_ref() {
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if idx != 1
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|| path.path.segments.last().unwrap().ident != "Context"
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{
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return Err(Error::new_spanned(
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arg,
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"Only types that implement `InputType` can be used as input arguments.",
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)
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.into());
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} else {
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create_ctx = false;
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}
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}
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}
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_ => {
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return Err(Error::new_spanned(arg, "Invalid argument type.").into())
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}
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}
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}
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}
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if create_ctx {
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let arg =
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syn::parse2::<FnArg>(quote! { _: &#crate_name::Context<'_> }).unwrap();
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method.sig.inputs.insert(1, arg);
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}
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let entity_type = ty.value_type();
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let mut key_pat = Vec::new();
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let mut key_getter = Vec::new();
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let mut use_keys = Vec::new();
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let mut keys = Vec::new();
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let mut keys_str = String::new();
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let mut requires_getter = Vec::new();
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let all_key = args.iter().all(|(_, _, arg)| !arg.key);
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if args.is_empty() {
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return Err(Error::new_spanned(
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method,
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"Entity need to have at least one key.",
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)
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.into());
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}
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for (ident, ty, args::Argument { name, key, .. }) in &args {
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let is_key = all_key || *key;
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let name = name.clone().unwrap_or_else(|| {
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object_args
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.rename_args
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.rename(ident.ident.unraw().to_string(), RenameTarget::Argument)
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});
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if is_key {
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if !keys_str.is_empty() {
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keys_str.push(' ');
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}
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keys_str.push_str(&name);
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key_pat.push(quote! {
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::std::option::Option::Some(#ident)
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});
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key_getter.push(quote! {
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params.get(#name).and_then(|value| {
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let value: ::std::option::Option<#ty> = #crate_name::InputType::parse(::std::option::Option::Some(::std::clone::Clone::clone(&value))).ok();
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value
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})
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});
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keys.push(name);
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use_keys.push(ident);
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} else {
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// requires
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requires_getter.push(quote! {
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let #ident: #ty = #crate_name::InputType::parse(params.get(#name).cloned()).
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map_err(|err| err.into_server_error().at(ctx.item.pos))?;
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});
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use_keys.push(ident);
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}
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}
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add_keys.push(quote! { registry.add_keys(&<#entity_type as #crate_name::Type>::type_name(), #keys_str); });
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create_entity_types.push(
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quote! { <#entity_type as #crate_name::Type>::create_type_info(registry); },
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);
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let field_ident = &method.sig.ident;
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if let OutputType::Value(inner_ty) = &ty {
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let block = &method.block;
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let new_block = quote!({
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{
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let value:#inner_ty = async move #block.await;
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::std::result::Result::Ok(value)
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}
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});
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method.block = syn::parse2::<Block>(new_block).expect("invalid block");
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method.sig.output =
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syn::parse2::<ReturnType>(quote! { -> #crate_name::Result<#inner_ty> })
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.expect("invalid result type");
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}
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let do_find = quote! { self.#field_ident(ctx, #(#use_keys),*).await.map_err(|err| err.into_server_error().at(ctx.item.pos))? };
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find_entities.push((
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args.len(),
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quote! {
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#(#cfg_attrs)*
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if typename == &<#entity_type as #crate_name::Type>::type_name() {
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if let (#(#key_pat),*) = (#(#key_getter),*) {
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#(#requires_getter)*
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let ctx_obj = ctx.with_selection_set(&ctx.item.node.selection_set);
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return #crate_name::OutputType::resolve(&#do_find, &ctx_obj, ctx.item).await.map(::std::option::Option::Some);
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}
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}
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},
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));
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} else if !method_args.skip {
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if method.sig.asyncness.is_none() {
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return Err(Error::new_spanned(&method, "Must be asynchronous").into());
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}
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let field_name = method_args.name.clone().unwrap_or_else(|| {
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object_args
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.rename_fields
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.rename(method.sig.ident.unraw().to_string(), RenameTarget::Field)
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});
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let field_desc = get_rustdoc(&method.attrs)?
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.map(|s| quote! { ::std::option::Option::Some(#s) })
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.unwrap_or_else(|| quote! {::std::option::Option::None});
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let field_deprecation = method_args
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.deprecation
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.as_ref()
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.map(|s| quote! { ::std::option::Option::Some(#s) })
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.unwrap_or_else(|| quote! {::std::option::Option::None});
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let external = method_args.external;
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let requires = match &method_args.requires {
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Some(requires) => quote! { ::std::option::Option::Some(#requires) },
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None => quote! { ::std::option::Option::None },
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};
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let provides = match &method_args.provides {
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Some(provides) => quote! { ::std::option::Option::Some(#provides) },
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None => quote! { ::std::option::Option::None },
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};
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let ty = match &method.sig.output {
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ReturnType::Type(_, ty) => OutputType::parse(ty)?,
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ReturnType::Default => {
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return Err(Error::new_spanned(&method.sig.output, "Missing type").into())
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}
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};
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let cache_control = {
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let public = method_args.cache_control.is_public();
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let max_age = method_args.cache_control.max_age;
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quote! {
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#crate_name::CacheControl {
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public: #public,
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max_age: #max_age,
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}
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}
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};
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let cfg_attrs = get_cfg_attrs(&method.attrs);
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let mut create_ctx = true;
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let mut args = Vec::new();
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for (idx, arg) in method.sig.inputs.iter_mut().enumerate() {
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if let FnArg::Receiver(receiver) = arg {
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if idx != 0 {
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return Err(Error::new_spanned(
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receiver,
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"The self receiver must be the first parameter.",
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)
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.into());
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}
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} else if let FnArg::Typed(pat) = arg {
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if idx == 0 {
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return Err(Error::new_spanned(
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pat,
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"The self receiver must be the first parameter.",
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)
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.into());
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}
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match (&*pat.pat, &*pat.ty) {
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(Pat::Ident(arg_ident), Type::Path(arg_ty)) => {
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args.push((
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arg_ident.clone(),
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arg_ty.clone(),
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parse_graphql_attrs::<args::Argument>(&pat.attrs)?
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.unwrap_or_default(),
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));
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remove_graphql_attrs(&mut pat.attrs);
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}
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(arg, Type::Reference(TypeReference { elem, .. })) => {
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if let Type::Path(path) = elem.as_ref() {
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if idx != 1
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|| path.path.segments.last().unwrap().ident != "Context"
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{
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return Err(Error::new_spanned(
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arg,
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"Only types that implement `InputType` can be used as input arguments.",
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)
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.into());
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}
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create_ctx = false;
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}
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}
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_ => {
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return Err(Error::new_spanned(arg, "Invalid argument type.").into())
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}
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}
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}
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}
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if create_ctx {
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let arg =
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syn::parse2::<FnArg>(quote! { _: &#crate_name::Context<'_> }).unwrap();
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method.sig.inputs.insert(1, arg);
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}
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let mut schema_args = Vec::new();
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let mut use_params = Vec::new();
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let mut get_params = Vec::new();
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for (
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ident,
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ty,
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args::Argument {
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name,
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desc,
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default,
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default_with,
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validator,
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..
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},
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) in args
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{
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let name = name.clone().unwrap_or_else(|| {
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object_args
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.rename_args
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.rename(ident.ident.unraw().to_string(), RenameTarget::Argument)
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});
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let desc = desc
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.as_ref()
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.map(|s| quote! {::std::option::Option::Some(#s)})
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.unwrap_or_else(|| quote! {::std::option::Option::None});
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let default = generate_default(&default, &default_with)?;
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let schema_default = default
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.as_ref()
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.map(|value| {
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quote! {
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::std::option::Option::Some(::std::string::ToString::to_string(
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&<#ty as #crate_name::InputType>::to_value(&#value)
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))
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}
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})
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.unwrap_or_else(|| quote! {::std::option::Option::None});
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let validator = match &validator {
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Some(meta) => {
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let stream = generate_validator(&crate_name, meta)?;
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quote!(::std::option::Option::Some(#stream))
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}
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None => quote!(::std::option::Option::None),
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};
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schema_args.push(quote! {
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args.insert(#name, #crate_name::registry::MetaInputValue {
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name: #name,
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description: #desc,
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ty: <#ty as #crate_name::Type>::create_type_info(registry),
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default_value: #schema_default,
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validator: #validator,
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});
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});
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let param_ident = &ident.ident;
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use_params.push(quote! { #param_ident });
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let default = match default {
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Some(default) => {
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quote! { ::std::option::Option::Some(|| -> #ty { #default }) }
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}
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None => quote! { ::std::option::Option::None },
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};
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let param_getter_name = get_param_getter_ident(&ident.ident.to_string());
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get_params.push(quote! {
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#[allow(non_snake_case)]
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let #param_getter_name = || -> #crate_name::ServerResult<#ty> { ctx.param_value(#name, #default) };
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#[allow(non_snake_case)]
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let #ident: #ty = #param_getter_name()?;
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});
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}
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let schema_ty = ty.value_type();
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schema_fields.push(quote! {
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#(#cfg_attrs)*
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fields.insert(::std::borrow::ToOwned::to_owned(#field_name), #crate_name::registry::MetaField {
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name: ::std::borrow::ToOwned::to_owned(#field_name),
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description: #field_desc,
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args: {
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let mut args = #crate_name::indexmap::IndexMap::new();
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#(#schema_args)*
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args
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},
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ty: <#schema_ty as #crate_name::Type>::create_type_info(registry),
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deprecation: #field_deprecation,
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cache_control: #cache_control,
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external: #external,
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provides: #provides,
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requires: #requires,
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});
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});
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let field_ident = &method.sig.ident;
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if let OutputType::Value(inner_ty) = &ty {
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let block = &method.block;
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let new_block = quote!({
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{
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let value:#inner_ty = async move #block.await;
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::std::result::Result::Ok(value)
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}
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});
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method.block = syn::parse2::<Block>(new_block).expect("invalid block");
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method.sig.output =
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syn::parse2::<ReturnType>(quote! { -> #crate_name::Result<#inner_ty> })
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.expect("invalid result type");
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}
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let resolve_obj = quote! {
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{
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let res = self.#field_ident(ctx, #(#use_params),*).await;
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res.map_err(|err| err.into_server_error().at(ctx.item.pos))?
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}
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};
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let guard = match &method_args.guard {
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Some(meta_list) => generate_guards(&crate_name, meta_list)?,
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None => None,
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};
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let guard = guard.map(|guard| {
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quote! {
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#guard.check(ctx).await
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.map_err(|err| err.into_server_error().at(ctx.item.pos))?;
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}
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});
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resolvers.push(quote! {
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#(#cfg_attrs)*
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if ctx.item.node.name.node == #field_name {
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#(#get_params)*
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#guard
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let ctx_obj = ctx.with_selection_set(&ctx.item.node.selection_set);
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let res = #resolve_obj;
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return #crate_name::OutputType::resolve(&res, &ctx_obj, ctx.item).await.map(::std::option::Option::Some);
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}
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});
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}
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remove_graphql_attrs(&mut method.attrs);
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}
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}
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|
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let cache_control = {
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let public = object_args.cache_control.is_public();
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let max_age = object_args.cache_control.max_age;
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quote! {
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#crate_name::CacheControl {
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public: #public,
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max_age: #max_age,
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}
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}
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};
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find_entities.sort_by(|(a, _), (b, _)| b.cmp(a));
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let find_entities_iter = find_entities.iter().map(|(_, code)| code);
|
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|
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if resolvers.is_empty() && create_entity_types.is_empty() {
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return Err(Error::new_spanned(
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&self_ty,
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"A GraphQL Object type must define one or more fields.",
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)
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.into());
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}
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|
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let expanded = quote! {
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#item_impl
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|
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#[allow(clippy::all, clippy::pedantic)]
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impl #generics #crate_name::Type for #self_ty #where_clause {
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fn type_name() -> ::std::borrow::Cow<'static, ::std::primitive::str> {
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::std::borrow::Cow::Borrowed(#gql_typename)
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}
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fn create_type_info(registry: &mut #crate_name::registry::Registry) -> ::std::string::String {
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let ty = registry.create_type::<Self, _>(|registry| #crate_name::registry::MetaType::Object {
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name: ::std::borrow::ToOwned::to_owned(#gql_typename),
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description: #desc,
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fields: {
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let mut fields = #crate_name::indexmap::IndexMap::new();
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#(#schema_fields)*
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fields
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},
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cache_control: #cache_control,
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extends: #extends,
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keys: ::std::option::Option::None,
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});
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#(#create_entity_types)*
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#(#add_keys)*
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ty
|
|
}
|
|
}
|
|
|
|
#[allow(clippy::all, clippy::pedantic, clippy::suspicious_else_formatting)]
|
|
#[allow(unused_braces, unused_variables, unused_parens, unused_mut)]
|
|
#[#crate_name::async_trait::async_trait]
|
|
impl#generics #crate_name::resolver_utils::ContainerType for #self_ty #where_clause {
|
|
async fn resolve_field(&self, ctx: &#crate_name::Context<'_>) -> #crate_name::ServerResult<::std::option::Option<#crate_name::Value>> {
|
|
#(#resolvers)*
|
|
::std::result::Result::Ok(::std::option::Option::None)
|
|
}
|
|
|
|
async fn find_entity(&self, ctx: &#crate_name::Context<'_>, params: &#crate_name::Value) -> #crate_name::ServerResult<::std::option::Option<#crate_name::Value>> {
|
|
let params = match params {
|
|
#crate_name::Value::Object(params) => params,
|
|
_ => return ::std::result::Result::Ok(::std::option::Option::None),
|
|
};
|
|
let typename = if let ::std::option::Option::Some(#crate_name::Value::String(typename)) = params.get("__typename") {
|
|
typename
|
|
} else {
|
|
return ::std::result::Result::Err(
|
|
#crate_name::ServerError::new(r#""__typename" must be an existing string."#)
|
|
.at(ctx.item.pos)
|
|
);
|
|
};
|
|
#(#find_entities_iter)*
|
|
::std::result::Result::Ok(::std::option::Option::None)
|
|
}
|
|
}
|
|
|
|
#[allow(clippy::all, clippy::pedantic)]
|
|
#[#crate_name::async_trait::async_trait]
|
|
impl #generics #crate_name::OutputType for #self_ty #where_clause {
|
|
async fn resolve(&self, ctx: &#crate_name::ContextSelectionSet<'_>, _field: &#crate_name::Positioned<#crate_name::parser::types::Field>) -> #crate_name::ServerResult<#crate_name::Value> {
|
|
#crate_name::resolver_utils::resolve_container(ctx, self).await
|
|
}
|
|
}
|
|
|
|
impl #generics #crate_name::ObjectType for #self_ty #where_clause {}
|
|
};
|
|
Ok(expanded.into())
|
|
}
|