Add readme example

Artem-Romanenia · Mar 25, 2024 · fd3541d · fd3541d
1 parent 8a29758
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diff --git a/README.md b/README.md
@@ -121,7 +121,7 @@ And here's the code that `o2o` generates (from here on, generated code is produc
 - [The (not so big) Problem](#the-not-so-big-problem)
 - [Inline expressions](#inline-expressions)
 - [Examples](#examples)
-  - [Different field name](#different-field-name)
+  - [Different member name](#different-member-name)
   - [Different field type](#different-field-type)
   - [Nested structs](#nested-structs)
   - [Nested collection](#nested-collection)
@@ -313,7 +313,7 @@ So finally, let's look at some examples.
 
 ## Examples
 
-### Different field name
+### Different member name
 
 ``` rust
 use o2o::o2o;
@@ -323,14 +323,29 @@ struct Entity {
     another_int: i16,
 }
 
+enum EntityEnum {
+    Entity(Entity),
+    SomethingElse { field: i32 }
+}
+
 #[derive(o2o)]
-#[from_ref(Entity)]
-#[ref_into_existing(Entity)]
+#[map_ref(Entity)]
 struct EntityDto {
     some_int: i32,
     #[map(another_int)]
     different_int: i16,
 }
+
+#[derive(o2o)]
+#[map_ref(EntityEnum)]
+enum EntityEnumDto {
+    #[map(Entity)]
+    EntityDto(#[map(~.into())]EntityDto),
+    SomethingElse { 
+        #[map(field, *~)]
+        f: i32 
+    }
+}
 ```
 <details>
   <summary>View generated code</summary>
@@ -350,6 +365,23 @@ struct EntityDto {
           other.another_int = self.different_int;
       }
   }
+
+  impl std::convert::From<&EntityEnum> for EntityEnumDto {
+      fn from(value: &EntityEnum) -> EntityEnumDto {
+          match value {
+              EntityEnum::Entity(f0) => EntityEnumDto::EntityDto(f0.into()),
+              EntityEnum::SomethingElse { field } => EntityEnumDto::SomethingElse { f: *field },
+          }
+      }
+  }
+  impl std::convert::Into<EntityEnum> for &EntityEnumDto {
+      fn into(self) -> EntityEnum {
+          match self {
+              EntityEnumDto::EntityDto(f0) => EntityEnum::Entity(f0.into()),
+              EntityEnumDto::SomethingElse { f } => EntityEnum::SomethingElse { field: *f },
+          }
+      }
+  }
   ```
 </details>
 
@@ -485,9 +517,6 @@ struct Child {
 #[map_owned(Entity)]
 struct EntityDto {
     some_int: i32,
-    // Here field name as well as type are different, so we pass in field name and tilde inline expression.
-    // Also, it doesn't hurt to use member trait instruction #[map()], 
-    // which is broader than trait instruction #[map_owned]
     #[map(children, ~.iter().map(|p|p.into()).collect())]
     children_vec: Vec<ChildDto>
 }
@@ -588,7 +617,7 @@ enum ZodiacSign {}
   ```
 </details>
 
-In a reverse case, you need to use a struct level `#[ghost()]` instruction:
+In a reverse case, you need to use a struct level `#[ghosts()]` instruction:
 ``` rust
 use o2o::o2o;
 
@@ -805,16 +834,12 @@ impl Employee {
 #[derive(o2o)]
 #[map(Employee)]
 #[ghosts(
-    // o2o supports closures with one input parameter.
-    // This parameter represents instance on the other side of the conversion.
     first_name: {@.get_first_name()},
     last_name: {@.get_last_name()}
 )]
 struct EmployeeDto {
     #[map(id)]
     employee_id: i32,
-    // '@.' is another flavor of 'inline expression'. 
-    // @ also represents instance on the other side of the conversion.
     #[ghost(@.get_full_name())]
     full_name: String,
 

diff --git a/o2o-impl/src/expand.rs b/o2o-impl/src/expand.rs
@@ -20,7 +20,6 @@ pub fn derive(node: &DeriveInput) -> Result<TokenStream> {
             let input = Enum::from_syn(node, data)?;
             let input = DataType::Enum(&input);
             validate(&input)?;
-            //Ok(TokenStream::new())
             Ok(struct_impl(input))
         },
         _ => Err(Error::new_spanned(
@@ -579,7 +578,7 @@ fn render_struct_line(
                 let index2 = Member::Unnamed(Index { index: idx as u32, span: Span::call_site() });
                 quote!(obj.#index2 = #obj #index;)
             } else { 
-                let index = if ctx.destructured_src { format_ident!("f{}", index).to_token_stream() } else { index.to_token_stream() };
+                let index = if ctx.destructured_src { format_ident!("f{}", index.index).to_token_stream() } else { index.to_token_stream() };
                 quote!(#obj #index,)
             },
         (syn::Member::Unnamed(index), None, Kind::OwnedIntoExisting | Kind::RefIntoExisting, StructKindHint::Tuple | StructKindHint::Unspecified) => {
@@ -590,7 +589,7 @@ fn render_struct_line(
             if f.attrs.has_parent_attr(&ctx.struct_attr.ty) {
                 if !ctx.kind.is_ref() { quote!((&value).into(),) } else { quote!(value.into(),) }
             } else {
-                let field_path = if ctx.destructured_src { get_field_path(&Member::Named(format_ident!("f{}", index))) } else { get_field_path(&f.member) };
+                let field_path = if ctx.destructured_src { get_field_path(&Member::Named(format_ident!("f{}", index.index))) } else { get_field_path(&f.member) };
                 quote!(#obj #field_path,)
             },
         (syn::Member::Unnamed(_), None, _, StructKindHint::Struct) => {
@@ -624,7 +623,7 @@ fn render_struct_line(
             quote!(#ident: #right_side,)
         },
         (syn::Member::Unnamed(index), Some(attr), Kind::OwnedInto | Kind::RefInto, StructKindHint::Tuple | StructKindHint::Unspecified) => {
-            let index = if ctx.destructured_src { Some(format_ident!("f{}", index).to_token_stream()) } else { Some(index.to_token_stream()) };
+            let index = if ctx.destructured_src { Some(format_ident!("f{}", index.index).to_token_stream()) } else { Some(index.to_token_stream()) };
             let right_side = attr.get_action_or(index.clone(), ctx, || quote!(#obj #index));
             quote!(#right_side,)
         },
@@ -644,7 +643,7 @@ fn render_struct_line(
             quote!(other.#field_path = #right_side;)
         },
         (syn::Member::Unnamed(index), Some(attr), Kind::FromOwned | Kind::FromRef, _) => {
-            let or = Member::Named(format_ident!("f{}", index));
+            let or = Member::Named(format_ident!("f{}", index.index));
             let right_side = attr.get_stuff(&obj, get_field_path, ctx, || if ctx.destructured_src { &or } else { &f.member});
             quote!(#right_side,)
         }
@@ -891,7 +890,7 @@ impl<'a> ApplicableAttr<'a> {
                     (Some(ident), Some(action)) => {
                         if let Member::Unnamed(index) = ident {
                             if ctx.destructured_src { 
-                                let ident = Member::Named(format_ident!("f{}", index));
+                                let ident = Member::Named(format_ident!("f{}", index.index));
                                 quote_action(action, Some(field_path(&ident)), ctx) 
                             } else { quote_action(action, Some(field_path(ident)), ctx)}
                         } else {