feat: add support for Option fields

src/de.rs

@@ -22,6 +22,7 @@ use crate::Row;
 /// - Vec<u8>
 /// - i64
 /// - f64
+/// - Option<T> (where T is any of the above)
 /// - ()
 ///
 /// # Example
@@ -146,9 +147,26 @@ impl<'de> Deserializer<'de> for V<'de> {
  }
  }
 
+ #[inline]
+ fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+ where
+ V: Visitor<'de>,
+ {
+ match self.0 {
+ Value::Text { value } => visitor.visit_some(value.to_string().into_deserializer()),
+ Value::Null => visitor.visit_none(),
+ Value::Float { value } => visitor.visit_some(value.into_deserializer()),
+ Value::Integer { value } => visitor.visit_some(value.into_deserializer()),
+ Value::Blob { value } => {
+ let seq = SeqDeserializer::new(value.iter().cloned());
+ visitor.visit_some(seq)
+ }
+ }
+ }
+
  serde::forward_to_deserialize_any! {
  bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
- bytes byte_buf option unit unit_struct newtype_struct seq tuple
+ bytes byte_buf unit unit_struct newtype_struct seq tuple
  tuple_struct map enum struct identifier ignored_any
  }
 }
@@ -168,6 +186,9 @@ mod tests {
  baz: i64,
  bab: Vec<u8>,
  ban: (),
+ bad: Option<i64>,
+ bac: Option<f64>,
+ bag: Option<Vec<u8>>,
  }
 
  #[test]
@@ -196,6 +217,15 @@ mod tests {
  },
  );
  row.value_map.insert("ban".to_string(), Value::Null);
+ row.value_map
+ .insert("bad".to_string(), Value::Integer { value: 42 });
+ row.value_map.insert("bac".to_string(), Value::Null);
+ row.value_map.insert(
+ "bag".to_string(),
+ Value::Blob {
+ value: vec![6u8; 128],
+ },
+ );
 
  let foo = from_row::<Foo>(&row).unwrap();
 
@@ -204,5 +234,8 @@ mod tests {
  assert!(foo.baf > 41.0);
  assert!(foo.baf2 > 42.0);
  assert_eq!(foo.bab, vec![6u8; 128]);
+ assert_eq!(foo.bad, Some(42));
+ assert_eq!(foo.bac, None);
+ assert_eq!(foo.bag, Some(vec![6u8; 128]));
  }
 }