enum accepts numbers from json

src/models.rs

@@ -3,7 +3,7 @@ use diesel::deserialize::{self, FromSql, FromSqlRow};
 use diesel::pg::{Pg, PgValue};
 use diesel::serialize::{IsNull, Output, ToSql};
 use diesel::*;
-use serde::{Deserialize, Serialize};
+use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use std::io::Write;
 use diesel::expression::AsExpression;
 use crate::schema::sql_types::BatteryStatusEnum;
@@ -24,7 +24,7 @@ pub struct Location {
   bear: Option<BigDecimal>,
 }
 
-#[derive(Debug, FromSqlRow, AsExpression, Serialize, Deserialize)]
+#[derive(Debug, FromSqlRow, AsExpression)]
 #[diesel(sql_type = BatteryStatusEnum)]
 pub enum BatteryStatus {
     Unknown,
@@ -56,3 +56,35 @@ impl FromSql<BatteryStatusEnum, Pg> for BatteryStatus {
         }
     }
 }
+
+// Custom JSON representation (if you want numbers in JSON)
+impl Serialize for BatteryStatus {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let code = match self {
+            BatteryStatus::Unknown   => 0,
+            BatteryStatus::Unplugged => 1,
+            BatteryStatus::Charging  => 2,
+            BatteryStatus::Full      => 3,
+        };
+        serializer.serialize_u8(code)
+    }
+}
+
+impl<'de> Deserialize<'de> for BatteryStatus {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let v = u8::deserialize(deserializer)?;
+        match v {
+            0 => Ok(BatteryStatus::Unknown),
+            1 => Ok(BatteryStatus::Unplugged),
+            2 => Ok(BatteryStatus::Charging),
+            3 => Ok(BatteryStatus::Full),
+            _ => Err(serde::de::Error::custom("invalid battery status code")),
+        }
+    }
+}