Manage errors

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

pkg/coredata/document.go

@@ -16,6 +16,7 @@ package coredata
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"maps"
 	"time"
@@ -41,8 +42,24 @@ type (
 	}
 
 	Documents []*Document
+
+	ErrDocumentNotFound struct {
+		Identifier string
+	}
+
+	ErrDocumentAlreadyExists struct {
+		message string
+	}
 )
 
+func (e ErrDocumentNotFound) Error() string {
+	return fmt.Sprintf("document not found: %q", e.Identifier)
+}
+
+func (e ErrDocumentAlreadyExists) Error() string {
+	return e.message
+}
+
 func (p Document) CursorKey(orderBy DocumentOrderField) page.CursorKey {
 	switch orderBy {
 	case DocumentOrderFieldCreatedAt:
@@ -95,6 +112,10 @@ LIMIT 1;
 
 	document, err := pgx.CollectExactlyOneRow(rows, pgx.RowToStructByName[Document])
 	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return &ErrDocumentNotFound{Identifier: documentID.String()}
+		}
+
 		return fmt.Errorf("cannot collect document: %w", err)
 	}