fix slug colliding error not showing when editing project (#534)

* fix slug colliding error not showing when editing project

* format

* re-introduce old code

* run sqlx prepare

---------

Co-authored-by: MagnusHJensen <magnus.holm.jensen@lego.dk>
Co-authored-by: Geometrically <18202329+Geometrically@users.noreply.github.com>

src/routes/projects.rs

@@ -894,6 +894,24 @@ pub async fn project_edit(
                     }
                 }
 
+                {
+                    let results = sqlx::query!(
+                        "
+                      SELECT EXISTS(SELECT 1 FROM mods WHERE slug = LOWER($1))
+                      ",
+                        slug
+                    )
+                    .fetch_one(&mut *transaction)
+                    .await?;
+
+                    if results.exists.unwrap_or(true) {
+                        return Err(ApiError::InvalidInput(
+                            "Slug collides with other project's id!"
+                                .to_string(),
+                        ));
+                    }
+                }
+
                 sqlx::query!(
                     "
                     UPDATE mods