529 lines
22 KiB
Rust
529 lines
22 KiB
Rust
use crate::args;
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use crate::output_type::OutputType;
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use crate::utils::{get_cfg_attrs, get_crate_name, get_param_getter_ident, get_rustdoc};
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use inflector::Inflector;
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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, Result, ReturnType, Type, TypeReference};
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pub fn generate(object_args: &args::Object, item_impl: &mut ItemImpl) -> Result<TokenStream> {
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let crate_name = get_crate_name(object_args.internal);
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let (self_ty, self_name) = match item_impl.self_ty.as_ref() {
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Type::Path(path) => (
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path,
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path.path
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.segments
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.last()
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.map(|s| s.ident.to_string())
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.unwrap(),
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),
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_ => return Err(Error::new_spanned(&item_impl.self_ty, "Invalid type")),
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};
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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(|| self_name.clone());
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let desc = object_args
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.desc
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.clone()
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.or_else(|| get_rustdoc(&item_impl.attrs).ok().flatten())
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.map(|s| quote! { Some(#s) })
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.unwrap_or_else(|| quote! {None});
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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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if args::Entity::parse(&crate_name, &method.attrs)?.is_some() {
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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"));
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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"))
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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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}
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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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}
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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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args::Argument::parse(&crate_name, &pat.attrs)?,
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));
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pat.attrs.clear();
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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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"The Context must be the second argument.",
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));
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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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_ => return Err(Error::new_spanned(arg, "Invalid argument type.")),
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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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}
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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
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.clone()
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.unwrap_or_else(|| ident.ident.unraw().to_string().to_camel_case());
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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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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: Option<#ty> = #crate_name::InputValueType::parse(Some(value.clone())).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::InputValueType::parse(params.get(#name).cloned()).
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map_err(|err| err.into_error(ctx.item.pos, <#ty as #crate_name::Type>::qualified_type_name()))?;
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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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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 = syn::parse2::<ReturnType>(
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quote! { -> #crate_name::FieldResult<#inner_ty> },
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)
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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_error(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::OutputValueType::resolve(&#do_find, &ctx_obj, ctx.item).await;
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}
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}
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},
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));
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method.attrs.remove(
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method
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.attrs
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.iter()
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.enumerate()
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.find(|(_, a)| a.path.is_ident("entity"))
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.map(|(idx, _)| idx)
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.unwrap(),
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);
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} else if let Some(field) = args::Field::parse(&crate_name, &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"));
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}
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let field_name = field
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.name
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.clone()
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.unwrap_or_else(|| method.sig.ident.unraw().to_string().to_camel_case());
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let field_desc = field
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.desc
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.as_ref()
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.map(|s| quote! {Some(#s)})
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.unwrap_or_else(|| quote! {None});
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let field_deprecation = field
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.deprecation
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.as_ref()
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.map(|s| quote! {Some(#s)})
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.unwrap_or_else(|| quote! {None});
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let external = field.external;
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let requires = match &field.requires {
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Some(requires) => quote! { Some(#requires) },
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None => quote! { None },
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};
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let provides = match &field.provides {
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Some(provides) => quote! { Some(#provides) },
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None => quote! { 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"))
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}
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};
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let cache_control = {
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let public = field.cache_control.public;
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let max_age = field.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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}
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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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}
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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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args::Argument::parse(&crate_name, &pat.attrs)?,
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));
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pat.attrs.clear();
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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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"The Context must be the second argument.",
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));
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}
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create_ctx = false;
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}
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}
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_ => return Err(Error::new_spanned(arg, "Invalid argument type.")),
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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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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
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.clone()
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.unwrap_or_else(|| ident.ident.unraw().to_string().to_camel_case());
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let desc = desc
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.as_ref()
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.map(|s| quote! {Some(#s)})
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.unwrap_or_else(|| quote! {None});
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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! {Some( <#ty as #crate_name::InputValueType>::to_value(&#value).to_string() )}
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})
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.unwrap_or_else(|| quote! {None});
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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) => quote! { Some(|| -> #ty { #default }) },
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None => quote! { 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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let #param_getter_name = || -> #crate_name::Result<#ty> { ctx.param_value(#name, #default) };
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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(#field_name.to_string(), #crate_name::registry::MetaField {
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name: #field_name.to_string(),
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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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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 = syn::parse2::<ReturnType>(
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quote! { -> #crate_name::FieldResult<#inner_ty> },
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)
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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_error_with_path(ctx.item.pos, ctx.path_node.as_ref()))?
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}
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};
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let guard = field
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.guard
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.map(|guard| quote! {
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#guard.check(ctx).await
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.map_err(|err| err.into_error_with_path(ctx.item.pos, ctx.path_node.as_ref()))?;
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});
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let post_guard = field
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.post_guard
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.map(|guard| quote! {
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#guard.check(ctx, &res).await
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.map_err(|err| err.into_error_with_path(ctx.item.pos, ctx.path_node.as_ref()))?;
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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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#post_guard
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return #crate_name::OutputValueType::resolve(&res, &ctx_obj, ctx.item).await;
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}
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});
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if let Some((idx, _)) = method
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.attrs
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.iter()
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.enumerate()
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.find(|(_, a)| a.path.is_ident("field"))
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{
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method.attrs.remove(idx);
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}
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} else if let Some((idx, _)) = method
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.attrs
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.iter()
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.enumerate()
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.find(|(_, a)| a.path.is_ident("field"))
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{
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method.attrs.remove(idx);
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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.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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|
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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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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, 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) -> String {
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let ty = registry.create_type::<Self, _>(|registry| #crate_name::registry::MetaType::Object {
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name: #gql_typename.to_string(),
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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: None,
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});
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#(#create_entity_types)*
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#(#add_keys)*
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ty
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}
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}
|
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|
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#[allow(clippy::all, clippy::pedantic, clippy::suspicious_else_formatting)]
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#[allow(unused_braces, unused_variables, unused_parens, unused_mut)]
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#[#crate_name::async_trait::async_trait]
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impl#generics #crate_name::resolver_utils::ObjectType for #self_ty #where_clause {
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async fn resolve_field(&self, ctx: &#crate_name::Context<'_>) -> #crate_name::Result<#crate_name::serde_json::Value> {
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#(#resolvers)*
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Err(#crate_name::QueryError::FieldNotFound {
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field_name: ctx.item.node.name.to_string(),
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object: #gql_typename.to_string(),
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}.into_error(ctx.item.pos))
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}
|
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|
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async fn find_entity(&self, ctx: &#crate_name::Context<'_>, params: &#crate_name::Value) -> #crate_name::Result<#crate_name::serde_json::Value> {
|
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let params = match params {
|
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#crate_name::Value::Object(params) => params,
|
|
_ => return Err(#crate_name::QueryError::EntityNotFound.into_error(ctx.item.pos)),
|
|
};
|
|
let typename = if let Some(#crate_name::Value::String(typename)) = params.get("__typename") {
|
|
typename
|
|
} else {
|
|
return Err(#crate_name::QueryError::TypeNameNotExists.into_error(ctx.item.pos));
|
|
};
|
|
#(#find_entities_iter)*
|
|
Err(#crate_name::QueryError::EntityNotFound.into_error(ctx.item.pos))
|
|
}
|
|
}
|
|
|
|
#[allow(clippy::all, clippy::pedantic)]
|
|
#[#crate_name::async_trait::async_trait]
|
|
impl #generics #crate_name::OutputValueType for #self_ty #where_clause {
|
|
async fn resolve(&self, ctx: &#crate_name::ContextSelectionSet<'_>, _field: &#crate_name::Positioned<#crate_name::parser::types::Field>) -> #crate_name::Result<#crate_name::serde_json::Value> {
|
|
#crate_name::resolver_utils::resolve_object(ctx, self).await
|
|
}
|
|
}
|
|
|
|
impl #generics #crate_name::type_mark::TypeMarkObject for #self_ty #where_clause {}
|
|
};
|
|
Ok(expanded.into())
|
|
}
|