2
这是我对奇怪的查询。只有第一个和最后一个行应该承担这样的问题:MySQL COUNT结果在RoR中被解释为字符串而不是整数
SELECT s.parent_id AS id, COUNT(s.parent_id) as count
FROM items i
LEFT OUTER JOIN (SELECT item_id, user_id, MAX(created_at) as created_at
FROM item_views iv
WHERE iv.user_id = ?
GROUP BY item_id) AS v ON i.id = v.item_id
LEFT OUTER JOIN categories c ON c.id = i.category_id
INNER JOIN (SELECT node.id AS node_id, parent.title AS parent_title, parent.id AS parent_id
FROM categories AS node, categories AS parent
WHERE node.lft BETWEEN parent.lft AND parent.rgt) s ON s.node_id=i.category_id
WHERE (i.updated_at > v.created_at OR v.created_at IS NULL)
AND i.updated_at > ?
GROUP BY s.parent_id;
当我把这个使用find_by_sql
,该count
列下的价值观似乎像"1"
而不是整数的字符串。当然,我可以很容易地打电话给to_i
,但肯定这不是最好的解决方案。我怀疑我的查询可能会导致MySQL返回字符串。