App methods now return errors that allow not-found cases to be distinguished.

1 files changed, 23 insertions, 0 deletions

diff --git a/src/repo/error.rs b/src/repo/error.rs
new file mode 100644
index 0000000..a5961e2
--- /dev/null
+++ b/src/repo/error.rs
@@ -0,0 +1,23 @@
+pub trait NotFound {
+    type Ok;
+    fn not_found<E, F>(self, map: F) -> Result<Self::Ok, E>
+    where
+        E: From<sqlx::Error>,
+        F: FnOnce() -> E;
+}
+
+impl<T> NotFound for Result<T, sqlx::Error> {
+    type Ok = T;
+
+    fn not_found<E, F>(self, map: F) -> Result<T, E>
+    where
+        E: From<sqlx::Error>,
+        F: FnOnce() -> E,
+    {
+        match self {
+            Err(sqlx::Error::RowNotFound) => Err(map()),
+            Err(other) => Err(other.into()),
+            Ok(value) => Ok(value),
+        }
+    }
+}