category creation fixed now

src/controllers/admin_categories.rs

@@ -49,10 +49,6 @@ async fn parse_category_fields(
         .text("name")
         .ok_or_else(|| Error::BadRequest("category name is required".to_string()))?;
     let description = form.text("description");
-    let position = form
-        .text("position")
-        .and_then(|s| s.parse::<i32>().ok())
-        .unwrap_or(0);
     let published = form.checked("published");
 
     // Resolve the chosen parent, rejecting cycles: a category may not be its
@@ -81,6 +77,28 @@ async fn parse_category_fields(
         None => None,
     };
 
+    // Position is optional: an explicit value sorts the category among its
+    // siblings, but a blank field appends it to the end of its parent's group
+    // (one past the current max), so new categories land last instead of first.
+    let position = match form.text("position").and_then(|s| s.parse::<i32>().ok()) {
+        Some(explicit) => explicit,
+        None => {
+            let mut query = categories::Entity::find();
+            query = match parent_id {
+                Some(pid) => query.filter(categories::Column::ParentId.eq(pid)),
+                None => query.filter(categories::Column::ParentId.is_null()),
+            };
+            query
+                .all(&ctx.db)
+                .await?
+                .iter()
+                .filter(|c| Some(c.id) != current_id)
+                .map(|c| c.position)
+                .max()
+                .map_or(0, |max| max + 1)
+        }
+    };
+
     let desired = form
         .text("slug")
         .map(|s| slugify(&s))