chore: add errors for managers

migra/src/error.rs

@@ -5,12 +5,32 @@ pub type MigraResult<T> = Result<T, Error>;
 
 #[derive(Debug)]
 pub enum Error {
+    FailedOpenTransaction,
+    FailedCommitTransaction,
+    FailedRollbackTransaction,
+
+    FailedCreateMigrationsTable,
+    FailedApplySql,
+    FailedInsertMigration,
+    FailedDeleteMigration,
+    FailedGetAppliedMigrations,
+
     Io(io::Error),
 }
 
 impl fmt::Display for Error {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
+            Error::FailedOpenTransaction => fmt.write_str("Failed to open a transaction"),
+            Error::FailedCommitTransaction => fmt.write_str("Failed to commit a transaction"),
+            Error::FailedRollbackTransaction => fmt.write_str("Failed to rollback a transaction"),
+            Error::FailedCreateMigrationsTable => {
+                fmt.write_str("Failed to create a migrations table")
+            }
+            Error::FailedApplySql => fmt.write_str("Failed to apply sql"),
+            Error::FailedInsertMigration => fmt.write_str("Failed to insert a migration"),
+            Error::FailedDeleteMigration => fmt.write_str("Failed to delete a migration"),
+            Error::FailedGetAppliedMigrations => fmt.write_str("Failed to get applied migrations"),
             Error::Io(ref error) => write!(fmt, "{}", error),
         }
     }