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use crate::Decimal;
use alloc::string::ToString;
use core::{fmt, str::FromStr};
use num_traits::FromPrimitive;
use serde::{self, de::Unexpected};
/// Serialize/deserialize Decimals as arbitrary precision numbers in JSON using the `arbitrary_precision` feature within `serde_json`.
///
/// ```
/// # use serde::{Serialize, Deserialize};
/// # use rust_decimal::Decimal;
/// # use std::str::FromStr;
///
/// #[derive(Serialize, Deserialize)]
/// pub struct ArbitraryExample {
/// #[serde(with = "rust_decimal::serde::arbitrary_precision")]
/// value: Decimal,
/// }
///
/// let value = ArbitraryExample { value: Decimal::from_str("123.400").unwrap() };
/// assert_eq!(
/// &serde_json::to_string(&value).unwrap(),
/// r#"{"value":123.400}"#
/// );
/// ```
#[cfg(feature = "serde-with-arbitrary-precision")]
pub mod arbitrary_precision {
use super::*;
use serde::Serialize;
pub fn deserialize<'de, D>(deserializer: D) -> Result<Decimal, D::Error>
where
D: serde::de::Deserializer<'de>,
{
deserializer.deserialize_any(DecimalVisitor)
}
pub fn serialize<S>(value: &Decimal, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
serde_json::Number::from_str(&value.to_string())
.map_err(serde::ser::Error::custom)?
.serialize(serializer)
}
}
/// Serialize/deserialize optional Decimals as arbitrary precision numbers in JSON using the `arbitrary_precision` feature within `serde_json`.
///
/// ```
/// # use serde::{Serialize, Deserialize};
/// # use rust_decimal::Decimal;
/// # use std::str::FromStr;
///
/// #[derive(Serialize, Deserialize)]
/// pub struct ArbitraryExample {
/// #[serde(with = "rust_decimal::serde::arbitrary_precision_option")]
/// value: Option<Decimal>,
/// }
///
/// let value = ArbitraryExample { value: Some(Decimal::from_str("123.400").unwrap()) };
/// assert_eq!(
/// &serde_json::to_string(&value).unwrap(),
/// r#"{"value":123.400}"#
/// );
///
/// let value = ArbitraryExample { value: None };
/// assert_eq!(
/// &serde_json::to_string(&value).unwrap(),
/// r#"{"value":null}"#
/// );
/// ```
#[cfg(feature = "serde-with-arbitrary-precision")]
pub mod arbitrary_precision_option {
use super::*;
use serde::Serialize;
pub fn deserialize<'de, D>(deserializer: D) -> Result<Option<Decimal>, D::Error>
where
D: serde::de::Deserializer<'de>,
{
deserializer.deserialize_option(OptionDecimalVisitor)
}
pub fn serialize<S>(value: &Option<Decimal>, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
match *value {
Some(ref decimal) => serde_json::Number::from_str(&decimal.to_string())
.map_err(serde::ser::Error::custom)?
.serialize(serializer),
None => serializer.serialize_none(),
}
}
}
/// Serialize/deserialize Decimals as floats.
///
/// ```
/// # use serde::{Serialize, Deserialize};
/// # use rust_decimal::Decimal;
/// # use std::str::FromStr;
///
/// #[derive(Serialize, Deserialize)]
/// pub struct FloatExample {
/// #[serde(with = "rust_decimal::serde::float")]
/// value: Decimal,
/// }
///
/// let value = FloatExample { value: Decimal::from_str("123.400").unwrap() };
/// assert_eq!(
/// &serde_json::to_string(&value).unwrap(),
/// r#"{"value":123.4}"#
/// );
/// ```
#[cfg(feature = "serde-with-float")]
pub mod float {
use super::*;
use serde::Serialize;
pub fn deserialize<'de, D>(deserializer: D) -> Result<Decimal, D::Error>
where
D: serde::de::Deserializer<'de>,
{
deserializer.deserialize_any(DecimalVisitor)
}
pub fn serialize<S>(value: &Decimal, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
use num_traits::ToPrimitive;
value.to_f64().unwrap().serialize(serializer)
}
}
/// Serialize/deserialize optional Decimals as floats.
///
/// ```
/// # use serde::{Serialize, Deserialize};
/// # use rust_decimal::Decimal;
/// # use std::str::FromStr;
///
/// #[derive(Serialize, Deserialize)]
/// pub struct FloatExample {
/// #[serde(with = "rust_decimal::serde::float_option")]
/// value: Option<Decimal>,
/// }
///
/// let value = FloatExample { value: Some(Decimal::from_str("123.400").unwrap()) };
/// assert_eq!(
/// &serde_json::to_string(&value).unwrap(),
/// r#"{"value":123.4}"#
/// );
///
/// let value = FloatExample { value: None };
/// assert_eq!(
/// &serde_json::to_string(&value).unwrap(),
/// r#"{"value":null}"#
/// );
/// ```
#[cfg(feature = "serde-with-float")]
pub mod float_option {
use super::*;
use serde::Serialize;
pub fn deserialize<'de, D>(deserializer: D) -> Result<Option<Decimal>, D::Error>
where
D: serde::de::Deserializer<'de>,
{
deserializer.deserialize_option(OptionDecimalVisitor)
}
pub fn serialize<S>(value: &Option<Decimal>, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
match *value {
Some(ref decimal) => {
use num_traits::ToPrimitive;
decimal.to_f64().unwrap().serialize(serializer)
}
None => serializer.serialize_none(),
}
}
}
/// Serialize/deserialize Decimals as strings. This is particularly useful when using binary encoding formats.
///
/// ```
/// # use serde::{Serialize, Deserialize};
/// # use rust_decimal::Decimal;
/// # use std::str::FromStr;
///
/// #[derive(Serialize, Deserialize)]
/// pub struct StringExample {
/// #[serde(with = "rust_decimal::serde::str")]
/// value: Decimal,
/// }
///
/// let value = StringExample { value: Decimal::from_str("123.400").unwrap() };
/// assert_eq!(
/// &serde_json::to_string(&value).unwrap(),
/// r#"{"value":"123.400"}"#
/// );
///
/// ```
#[cfg(feature = "serde-with-str")]
pub mod str {
use super::*;
pub fn deserialize<'de, D>(deserializer: D) -> Result<Decimal, D::Error>
where
D: serde::de::Deserializer<'de>,
{
deserializer.deserialize_str(DecimalVisitor)
}
pub fn serialize<S>(value: &Decimal, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
let value = crate::str::to_str_internal(value, true, None);
serializer.serialize_str(value.0.as_ref())
}
}
/// Serialize/deserialize optional Decimals as strings. This is particularly useful when using binary encoding formats.
///
/// ```
/// # use serde::{Serialize, Deserialize};
/// # use rust_decimal::Decimal;
/// # use std::str::FromStr;
///
/// #[derive(Serialize, Deserialize)]
/// pub struct StringExample {
/// #[serde(with = "rust_decimal::serde::str_option")]
/// value: Option<Decimal>,
/// }
///
/// let value = StringExample { value: Some(Decimal::from_str("123.400").unwrap()) };
/// assert_eq!(
/// &serde_json::to_string(&value).unwrap(),
/// r#"{"value":"123.400"}"#
/// );
///
/// let value = StringExample { value: None };
/// assert_eq!(
/// &serde_json::to_string(&value).unwrap(),
/// r#"{"value":null}"#
/// );
/// ```
#[cfg(feature = "serde-with-str")]
pub mod str_option {
use super::*;
pub fn deserialize<'de, D>(deserializer: D) -> Result<Option<Decimal>, D::Error>
where
D: serde::de::Deserializer<'de>,
{
deserializer.deserialize_option(OptionDecimalStrVisitor)
}
pub fn serialize<S>(value: &Option<Decimal>, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
match *value {
Some(ref decimal) => {
let decimal = crate::str::to_str_internal(decimal, true, None);
serializer.serialize_some(decimal.0.as_ref())
}
None => serializer.serialize_none(),
}
}
}
#[cfg(not(feature = "serde-str"))]
impl<'de> serde::Deserialize<'de> for Decimal {
fn deserialize<D>(deserializer: D) -> Result<Decimal, D::Error>
where
D: serde::de::Deserializer<'de>,
{
deserializer.deserialize_any(DecimalVisitor)
}
}
#[cfg(all(feature = "serde-str", not(feature = "serde-float")))]
impl<'de> serde::Deserialize<'de> for Decimal {
fn deserialize<D>(deserializer: D) -> Result<Decimal, D::Error>
where
D: serde::de::Deserializer<'de>,
{
deserializer.deserialize_str(DecimalVisitor)
}
}
#[cfg(all(feature = "serde-str", feature = "serde-float"))]
impl<'de> serde::Deserialize<'de> for Decimal {
fn deserialize<D>(deserializer: D) -> Result<Decimal, D::Error>
where
D: serde::de::Deserializer<'de>,
{
deserializer.deserialize_f64(DecimalVisitor)
}
}
// It's a shame this needs to be redefined for this feature and not able to be referenced directly
#[cfg(feature = "serde-with-arbitrary-precision")]
const DECIMAL_KEY_TOKEN: &str = "$serde_json::private::Number";
struct DecimalVisitor;
impl<'de> serde::de::Visitor<'de> for DecimalVisitor {
type Value = Decimal;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(formatter, "a Decimal type representing a fixed-point number")
}
fn visit_i64<E>(self, value: i64) -> Result<Decimal, E>
where
E: serde::de::Error,
{
match Decimal::from_i64(value) {
Some(s) => Ok(s),
None => Err(E::invalid_value(Unexpected::Signed(value), &self)),
}
}
fn visit_u64<E>(self, value: u64) -> Result<Decimal, E>
where
E: serde::de::Error,
{
match Decimal::from_u64(value) {
Some(s) => Ok(s),
None => Err(E::invalid_value(Unexpected::Unsigned(value), &self)),
}
}
fn visit_f64<E>(self, value: f64) -> Result<Decimal, E>
where
E: serde::de::Error,
{
Decimal::from_str(&value.to_string()).map_err(|_| E::invalid_value(Unexpected::Float(value), &self))
}
fn visit_str<E>(self, value: &str) -> Result<Decimal, E>
where
E: serde::de::Error,
{
Decimal::from_str(value)
.or_else(|_| Decimal::from_scientific(value))
.map_err(|_| E::invalid_value(Unexpected::Str(value), &self))
}
#[cfg(feature = "serde-with-arbitrary-precision")]
fn visit_map<A>(self, map: A) -> Result<Decimal, A::Error>
where
A: serde::de::MapAccess<'de>,
{
let mut map = map;
let value = map.next_key::<DecimalKey>()?;
if value.is_none() {
return Err(serde::de::Error::invalid_type(Unexpected::Map, &self));
}
let v: DecimalFromString = map.next_value()?;
Ok(v.value)
}
}
struct OptionDecimalVisitor;
impl<'de> serde::de::Visitor<'de> for OptionDecimalVisitor {
type Value = Option<Decimal>;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a Decimal type representing a fixed-point number")
}
fn visit_none<E>(self) -> Result<Option<Decimal>, E>
where
E: serde::de::Error,
{
Ok(None)
}
#[cfg(all(feature = "serde-str", feature = "serde-float"))]
fn visit_some<D>(self, d: D) -> Result<Option<Decimal>, D::Error>
where
D: serde::de::Deserializer<'de>,
{
// We've got multiple types that we may see so we need to use any
d.deserialize_any(DecimalVisitor).map(Some)
}
#[cfg(not(all(feature = "serde-str", feature = "serde-float")))]
fn visit_some<D>(self, d: D) -> Result<Option<Decimal>, D::Error>
where
D: serde::de::Deserializer<'de>,
{
<Decimal as serde::Deserialize>::deserialize(d).map(Some)
}
}
#[cfg(feature = "serde-with-str")]
struct OptionDecimalStrVisitor;
#[cfg(feature = "serde-with-str")]
impl<'de> serde::de::Visitor<'de> for OptionDecimalStrVisitor {
type Value = Option<Decimal>;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a Decimal type representing a fixed-point number")
}
fn visit_none<E>(self) -> Result<Option<Decimal>, E>
where
E: serde::de::Error,
{
Ok(None)
}
fn visit_some<D>(self, d: D) -> Result<Option<Decimal>, D::Error>
where
D: serde::de::Deserializer<'de>,
{
d.deserialize_str(DecimalVisitor).map(Some)
}
}
#[cfg(feature = "serde-with-arbitrary-precision")]
struct DecimalKey;
#[cfg(feature = "serde-with-arbitrary-precision")]
impl<'de> serde::de::Deserialize<'de> for DecimalKey {
fn deserialize<D>(deserializer: D) -> Result<DecimalKey, D::Error>
where
D: serde::de::Deserializer<'de>,
{
struct FieldVisitor;
impl<'de> serde::de::Visitor<'de> for FieldVisitor {
type Value = ();
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a valid decimal field")
}
fn visit_str<E>(self, s: &str) -> Result<(), E>
where
E: serde::de::Error,
{
if s == DECIMAL_KEY_TOKEN {
Ok(())
} else {
Err(serde::de::Error::custom("expected field with custom name"))
}
}
}
deserializer.deserialize_identifier(FieldVisitor)?;
Ok(DecimalKey)
}
}
#[cfg(feature = "serde-with-arbitrary-precision")]
pub struct DecimalFromString {
pub value: Decimal,
}
#[cfg(feature = "serde-with-arbitrary-precision")]
impl<'de> serde::de::Deserialize<'de> for DecimalFromString {
fn deserialize<D>(deserializer: D) -> Result<DecimalFromString, D::Error>
where
D: serde::de::Deserializer<'de>,
{
struct Visitor;
impl<'de> serde::de::Visitor<'de> for Visitor {
type Value = DecimalFromString;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("string containing a decimal")
}
fn visit_str<E>(self, value: &str) -> Result<DecimalFromString, E>
where
E: serde::de::Error,
{
let d = Decimal::from_str(value)
.or_else(|_| Decimal::from_scientific(value))
.map_err(serde::de::Error::custom)?;
Ok(DecimalFromString { value: d })
}
}
deserializer.deserialize_str(Visitor)
}
}
#[cfg(not(feature = "serde-float"))]
impl serde::Serialize for Decimal {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
let value = crate::str::to_str_internal(self, true, None);
serializer.serialize_str(value.0.as_ref())
}
}
#[cfg(all(feature = "serde-float", not(feature = "serde-arbitrary-precision")))]
impl serde::Serialize for Decimal {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
use num_traits::ToPrimitive;
serializer.serialize_f64(self.to_f64().unwrap())
}
}
#[cfg(all(feature = "serde-float", feature = "serde-arbitrary-precision"))]
impl serde::Serialize for Decimal {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
serde_json::Number::from_str(&self.to_string())
.map_err(serde::ser::Error::custom)?
.serialize(serializer)
}
}
#[cfg(test)]
mod test {
use super::*;
use serde::{Deserialize, Serialize};
#[derive(Serialize, Deserialize, Debug)]
struct Record {
amount: Decimal,
}
#[test]
#[cfg(not(feature = "serde-str"))]
fn deserialize_valid_decimal() {
let data = [
("{\"amount\":\"1.234\"}", "1.234"),
("{\"amount\":1234}", "1234"),
("{\"amount\":1234.56}", "1234.56"),
("{\"amount\":\"1.23456e3\"}", "1234.56"),
];
for &(serialized, value) in data.iter() {
let result = serde_json::from_str(serialized);
assert_eq!(
true,
result.is_ok(),
"expected successful deserialization for {}. Error: {:?}",
serialized,
result.err().unwrap()
);
let record: Record = result.unwrap();
assert_eq!(
value,
record.amount.to_string(),
"expected: {}, actual: {}",
value,
record.amount.to_string()
);
}
}
#[test]
#[cfg(feature = "serde-arbitrary-precision")]
fn deserialize_basic_decimal() {
let d: Decimal = serde_json::from_str("1.1234127836128763").unwrap();
// Typically, this would not work without this feature enabled due to rounding
assert_eq!(d.to_string(), "1.1234127836128763");
}
#[test]
#[should_panic]
fn deserialize_invalid_decimal() {
let serialized = "{\"amount\":\"foo\"}";
let _: Record = serde_json::from_str(serialized).unwrap();
}
#[test]
#[cfg(not(feature = "serde-float"))]
fn serialize_decimal() {
let record = Record {
amount: Decimal::new(1234, 3),
};
let serialized = serde_json::to_string(&record).unwrap();
assert_eq!("{\"amount\":\"1.234\"}", serialized);
}
#[test]
#[cfg(not(feature = "serde-float"))]
fn serialize_negative_zero() {
let record = Record { amount: -Decimal::ZERO };
let serialized = serde_json::to_string(&record).unwrap();
assert_eq!("{\"amount\":\"-0\"}", serialized);
}
#[test]
#[cfg(feature = "serde-float")]
fn serialize_decimal() {
let record = Record {
amount: Decimal::new(1234, 3),
};
let serialized = serde_json::to_string(&record).unwrap();
assert_eq!("{\"amount\":1.234}", serialized);
}
#[test]
#[cfg(all(feature = "serde-float", feature = "serde-arbitrary-precision"))]
fn serialize_decimal_roundtrip() {
let record = Record {
// 4.81 is intentionally chosen as it is unrepresentable as a floating point number, meaning this test
// would fail if the `serde-arbitrary-precision` was not activated.
amount: Decimal::new(481, 2),
};
let serialized = serde_json::to_string(&record).unwrap();
assert_eq!("{\"amount\":4.81}", serialized);
let deserialized: Record = serde_json::from_str(&serialized).unwrap();
assert_eq!(record.amount, deserialized.amount);
}
#[test]
#[cfg(all(feature = "serde-str", not(feature = "serde-float")))]
fn serialize_decimal_roundtrip() {
let record = Record {
amount: Decimal::new(481, 2),
};
let serialized = serde_json::to_string(&record).unwrap();
assert_eq!("{\"amount\":\"4.81\"}", serialized);
let deserialized: Record = serde_json::from_str(&serialized).unwrap();
assert_eq!(record.amount, deserialized.amount);
}
#[test]
#[cfg(all(feature = "serde-str", not(feature = "serde-float")))]
fn bincode_serialization() {
use bincode::{deserialize, serialize};
let data = [
"0",
"0.00",
"3.14159",
"-3.14159",
"1234567890123.4567890",
"-1234567890123.4567890",
"5233.9008808150288439427720175",
"-5233.9008808150288439427720175",
];
for &raw in data.iter() {
let value = Decimal::from_str(raw).unwrap();
let encoded = serialize(&value).unwrap();
let decoded: Decimal = deserialize(&encoded[..]).unwrap();
assert_eq!(value, decoded);
assert_eq!(8usize + raw.len(), encoded.len());
}
}
#[test]
#[cfg(all(feature = "serde-str", feature = "serde-float"))]
fn bincode_serialization() {
use bincode::{deserialize, serialize};
let data = [
("0", "0"),
("0.00", "0.00"),
("3.14159", "3.14159"),
("-3.14159", "-3.14159"),
("1234567890123.4567890", "1234567890123.4568"),
("-1234567890123.4567890", "-1234567890123.4568"),
];
for &(value, expected) in data.iter() {
let value = Decimal::from_str(value).unwrap();
let expected = Decimal::from_str(expected).unwrap();
let encoded = serialize(&value).unwrap();
let decoded: Decimal = deserialize(&encoded[..]).unwrap();
assert_eq!(expected, decoded);
assert_eq!(8usize, encoded.len());
}
}
#[test]
#[cfg(all(feature = "serde-str", not(feature = "serde-float")))]
fn bincode_nested_serialization() {
// Issue #361
#[derive(Deserialize, Serialize, Debug)]
pub struct Foo {
value: Decimal,
}
let s = Foo {
value: Decimal::new(-1, 3).round_dp(0),
};
let ser = bincode::serialize(&s).unwrap();
let des: Foo = bincode::deserialize(&ser).unwrap();
assert_eq!(des.value, s.value);
}
#[test]
#[cfg(feature = "serde-with-arbitrary-precision")]
fn with_arbitrary_precision() {
#[derive(Serialize, Deserialize)]
pub struct ArbitraryExample {
#[serde(with = "crate::serde::arbitrary_precision")]
value: Decimal,
}
let value = ArbitraryExample {
value: Decimal::from_str("123.400").unwrap(),
};
assert_eq!(&serde_json::to_string(&value).unwrap(), r#"{"value":123.400}"#);
}
#[test]
#[cfg(feature = "serde-with-arbitrary-precision")]
fn with_arbitrary_precision_from_string() {
#[derive(Serialize, Deserialize)]
pub struct ArbitraryExample {
#[serde(with = "crate::serde::arbitrary_precision")]
value: Decimal,
}
let value: ArbitraryExample = serde_json::from_str(r#"{"value":"1.1234127836128763"}"#).unwrap();
assert_eq!(value.value.to_string(), "1.1234127836128763");
}
#[test]
#[cfg(feature = "serde-with-float")]
fn with_float() {
#[derive(Serialize, Deserialize)]
pub struct FloatExample {
#[serde(with = "crate::serde::float")]
value: Decimal,
}
let value = FloatExample {
value: Decimal::from_str("123.400").unwrap(),
};
assert_eq!(&serde_json::to_string(&value).unwrap(), r#"{"value":123.4}"#);
}
#[test]
#[cfg(feature = "serde-with-str")]
fn with_str() {
#[derive(Serialize, Deserialize)]
pub struct StringExample {
#[serde(with = "crate::serde::str")]
value: Decimal,
}
let value = StringExample {
value: Decimal::from_str("123.400").unwrap(),
};
assert_eq!(&serde_json::to_string(&value).unwrap(), r#"{"value":"123.400"}"#);
}
#[test]
#[cfg(feature = "serde-with-str")]
fn with_str_bincode() {
use bincode::{deserialize, serialize};
#[derive(Serialize, Deserialize)]
struct BincodeExample {
#[serde(with = "crate::serde::str")]
value: Decimal,
}
let data = [
("0", "0"),
("0.00", "0.00"),
("1.234", "1.234"),
("3.14159", "3.14159"),
("-3.14159", "-3.14159"),
("1234567890123.4567890", "1234567890123.4567890"),
("-1234567890123.4567890", "-1234567890123.4567890"),
];
for &(value, expected) in data.iter() {
let value = Decimal::from_str(value).unwrap();
let expected = Decimal::from_str(expected).unwrap();
let input = BincodeExample { value };
let encoded = serialize(&input).unwrap();
let decoded: BincodeExample = deserialize(&encoded[..]).unwrap();
assert_eq!(expected, decoded.value);
}
}
#[test]
#[cfg(feature = "serde-with-str")]
fn with_str_bincode_optional() {
use bincode::{deserialize, serialize};
#[derive(Serialize, Deserialize)]
struct BincodeExample {
#[serde(with = "crate::serde::str_option")]
value: Option<Decimal>,
}
// Some(value)
let value = Some(Decimal::new(1234, 3));
let input = BincodeExample { value };
let encoded = serialize(&input).unwrap();
let decoded: BincodeExample = deserialize(&encoded[..]).unwrap();
assert_eq!(value, decoded.value, "Some(value)");
// None
let input = BincodeExample { value: None };
let encoded = serialize(&input).unwrap();
let decoded: BincodeExample = deserialize(&encoded[..]).unwrap();
assert_eq!(None, decoded.value, "None");
}
#[test]
#[cfg(feature = "serde-with-str")]
fn with_str_optional() {
#[derive(Serialize, Deserialize)]
pub struct StringExample {
#[serde(with = "crate::serde::str_option")]
value: Option<Decimal>,
}
let original = StringExample {
value: Some(Decimal::from_str("123.400").unwrap()),
};
assert_eq!(&serde_json::to_string(&original).unwrap(), r#"{"value":"123.400"}"#);
let deserialized: StringExample = serde_json::from_str(r#"{"value":"123.400"}"#).unwrap();
assert_eq!(deserialized.value, original.value);
assert!(deserialized.value.is_some());
assert_eq!(deserialized.value.unwrap().unpack(), original.value.unwrap().unpack());
// Null tests
let original = StringExample { value: None };
assert_eq!(&serde_json::to_string(&original).unwrap(), r#"{"value":null}"#);
let deserialized: StringExample = serde_json::from_str(r#"{"value":null}"#).unwrap();
assert_eq!(deserialized.value, original.value);
assert!(deserialized.value.is_none());
}
#[test]
#[cfg(feature = "serde-with-float")]
fn with_float_optional() {
#[derive(Serialize, Deserialize)]
pub struct StringExample {
#[serde(with = "crate::serde::float_option")]
value: Option<Decimal>,
}
let original = StringExample {
value: Some(Decimal::from_str("123.400").unwrap()),
};
assert_eq!(&serde_json::to_string(&original).unwrap(), r#"{"value":123.4}"#);
let deserialized: StringExample = serde_json::from_str(r#"{"value":123.4}"#).unwrap();
assert_eq!(deserialized.value, original.value);
assert!(deserialized.value.is_some()); // Scale is different!
// Null tests
let original = StringExample { value: None };
assert_eq!(&serde_json::to_string(&original).unwrap(), r#"{"value":null}"#);
let deserialized: StringExample = serde_json::from_str(r#"{"value":null}"#).unwrap();
assert_eq!(deserialized.value, original.value);
assert!(deserialized.value.is_none());
}
#[test]
#[cfg(feature = "serde-with-arbitrary-precision")]
fn with_arbitrary_precision_optional() {
#[derive(Serialize, Deserialize)]
pub struct StringExample {
#[serde(with = "crate::serde::arbitrary_precision_option")]
value: Option<Decimal>,
}
let original = StringExample {
value: Some(Decimal::from_str("123.400").unwrap()),
};
assert_eq!(&serde_json::to_string(&original).unwrap(), r#"{"value":123.400}"#);
let deserialized: StringExample = serde_json::from_str(r#"{"value":123.400}"#).unwrap();
assert_eq!(deserialized.value, original.value);
assert!(deserialized.value.is_some());
assert_eq!(deserialized.value.unwrap().unpack(), original.value.unwrap().unpack());
// Null tests
let original = StringExample { value: None };
assert_eq!(&serde_json::to_string(&original).unwrap(), r#"{"value":null}"#);
let deserialized: StringExample = serde_json::from_str(r#"{"value":null}"#).unwrap();
assert_eq!(deserialized.value, original.value);
assert!(deserialized.value.is_none());
}
}