Fix for Issue #2549 - cannot use feature "rust_decimal" without also using "bigdecimal" (#2585)

* Fix missing num-bigint dependency for rust_decimal

* Fix missing feature name change from "decimal" to "rust_decimal"

* update missing "decimal"->"rust_decimal" renaming in range.rs

* Update money.rs references to "decimal"

* Update "decimal" -> "rust_decimal"

sqlx-postgres/src/types/mod.rs

@@ -196,7 +196,7 @@ mod time_tz;
 #[cfg(feature = "bigdecimal")]
 mod bigdecimal;
 
-#[cfg(any(feature = "bigdecimal", feature = "decimal"))]
+#[cfg(any(feature = "bigdecimal", feature = "rust_decimal"))]
 mod numeric;
 
 #[cfg(feature = "rust_decimal")]

sqlx-postgres/src/types/money.rs

@@ -81,7 +81,7 @@ impl PgMoney {
     /// See the type-level docs for an explanation of `locale_frac_digits`.
     ///
     /// [`Decimal`]: crate::types::Decimal
-    #[cfg(feature = "decimal")]
+    #[cfg(feature = "rust_decimal")]
     pub fn to_decimal(self, locale_frac_digits: u32) -> rust_decimal::Decimal {
         rust_decimal::Decimal::new(self.0, locale_frac_digits)
     }
@@ -94,7 +94,7 @@ impl PgMoney {
     /// If the value is larger than 63 bits it will be truncated.
     ///
     /// [`Decimal`]: crate::types::Decimal
-    #[cfg(feature = "decimal")]
+    #[cfg(feature = "rust_decimal")]
     pub fn from_decimal(mut decimal: rust_decimal::Decimal, locale_frac_digits: u32) -> Self {
         // this is all we need to convert to our expected locale's `frac_digits`
         decimal.rescale(locale_frac_digits);
@@ -316,7 +316,7 @@ mod tests {
     }
 
     #[test]
-    #[cfg(feature = "decimal")]
+    #[cfg(feature = "rust_decimal")]
     fn conversion_to_decimal_works() {
         assert_eq!(
             rust_decimal::Decimal::new(12345, 2),
@@ -325,7 +325,7 @@ mod tests {
     }
 
     #[test]
-    #[cfg(feature = "decimal")]
+    #[cfg(feature = "rust_decimal")]
     fn conversion_from_decimal_works() {
         assert_eq!(
             PgMoney(12345),

sqlx-postgres/src/types/range.rs

@@ -143,7 +143,7 @@ impl Type<Postgres> for PgRange<bigdecimal::BigDecimal> {
     }
 }
 
-#[cfg(feature = "decimal")]
+#[cfg(feature = "rust_decimal")]
 impl Type<Postgres> for PgRange<rust_decimal::Decimal> {
     fn type_info() -> PgTypeInfo {
         PgTypeInfo::NUM_RANGE