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Make #[serde(alias)] works in #[serde(flatten)] context #2387

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merged 2 commits into from Mar 7, 2023
Merged

Make #[serde(alias)] works in #[serde(flatten)] context #2387

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f5e0fbc
Make #[serde(alias)] works in #[serde(flatten)] context
bebecue Mar 5, 2023
01da3f7
Add tests for #2387
bebecue Mar 7, 2023
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3 changes: 2 additions & 1 deletion serde_derive/src/de.rs
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Expand Up @@ -2400,7 +2400,8 @@ fn deserialize_struct_as_struct_visitor(
.collect();

let fields_stmt = {
let field_names = field_names_idents.iter().map(|(name, _, _)| name);
let field_names = field_names_idents.iter().flat_map(|(_, _, aliases)| aliases);

quote_block! {
const FIELDS: &'static [&'static str] = &[ #(#field_names),* ];
}
Expand Down
72 changes: 67 additions & 5 deletions test_suite/tests/test_annotations.rs
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Expand Up @@ -642,7 +642,7 @@ fn test_unknown_field_rename_struct() {
Token::Str("a4"),
Token::I32(3),
],
"unknown field `a4`, expected one of `a1`, `a2`, `a6`",
"unknown field `a4`, expected one of `a1`, `a3`, `a2`, `a5`, `a6`",
);
}

Expand Down Expand Up @@ -780,7 +780,7 @@ fn test_rename_enum() {
Token::StructVariant {
name: "AliasEnum",
variant: "sailor_moon",
len: 3,
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len: 5,
},
Token::Str("a"),
Token::I8(0),
Expand All @@ -798,7 +798,7 @@ fn test_rename_enum() {
Token::StructVariant {
name: "AliasEnum",
variant: "usagi_tsukino",
len: 3,
len: 5,
},
Token::Str("a"),
Token::I8(0),
Expand Down Expand Up @@ -827,7 +827,7 @@ fn test_unknown_field_rename_enum() {
Token::StructVariant {
name: "AliasEnum",
variant: "usagi_tsukino",
len: 3,
len: 5,
},
Token::Str("a"),
Token::I8(0),
Expand All @@ -836,7 +836,7 @@ fn test_unknown_field_rename_enum() {
Token::Str("d"),
Token::I8(2),
],
"unknown field `d`, expected one of `a`, `b`, `f`",
"unknown field `d`, expected one of `a`, `c`, `b`, `e`, `f`",
);
}

Expand Down Expand Up @@ -2658,6 +2658,68 @@ fn test_flatten_any_after_flatten_struct() {
);
}

#[test]
fn test_alias_in_flatten_context() {
#[derive(Debug, PartialEq, Deserialize)]
struct Outer {
#[serde(flatten)]
a: AliasStruct,
b: i32,
}

assert_de_tokens(
&Outer {
a: AliasStruct {
a1: 1,
a2: 2,
a4: 4,
},
b: 7,
},
&[
Token::Struct {
name: "Outer",
len: 4,
},
Token::Str("a1"),
Token::I32(1),
Token::Str("a2"),
Token::I32(2),
Token::Str("a5"),
Token::I32(4),
Token::Str("b"),
Token::I32(7),
Token::StructEnd,
],
);

assert_de_tokens(
&Outer {
a: AliasStruct {
a1: 1,
a2: 2,
a4: 4,
},
b: 7,
},
&[
Token::Struct {
name: "Outer",
len: 4,
},
Token::Str("a1"),
Token::I32(1),
Token::Str("a2"),
Token::I32(2),
Token::Str("a6"),
Token::I32(4),
Token::Str("b"),
Token::I32(7),
Token::StructEnd,
],
);
}

#[test]
fn test_expecting_message() {
#[derive(Deserialize, PartialEq, Debug)]
Expand Down