Question

在以下代码中，find_by_sql失败，异常：参数个数错误（0表示1）。知道发生了什么事吗？

def filter_new_unfollowers(unfollower_ids)
  relationships = TwitterRelationship.find_by_sql["SELECT * FROM  twitter_relationships
                           INNER JOIN twitter_identities ON (twitter_identities.twitter_id=twitter_relationships.source_twitter_id)
                           INNER JOIN member_twitter_identities ON (member_twitter_identities.twitter_identity_id = twitter_identities.id) 
                            WHERE member_twitter_identities.member_id IN (?)", unfollower_ids]

end

Answer 1

你编写它的方式，你试图在没有参数的情况下执行find_by_sql，然后在结果上调用[]运算符（但是在你到达之前它失败了）。

在“[”之前需要一个空格。为了更清楚，我会在数组参数“... find_by_sql（[...]）”周围加上括号。

Answer 2

尝试添加括号：

relationships = TwitterRelationship.find_by_sql(["SELECT * FROM  twitter_relationships
                           INNER JOIN twitter_identities ON (twitter_identities.twitter_id=twitter_relationships.source_twitter_id)
                           INNER JOIN member_twitter_identities ON (member_twitter_identities.twitter_identity_id = twitter_identities.id)
                            WHERE member_twitter_identities.member_id IN (?)", unfollower_ids])

find_by_sql失败，异常：参数数量错误

2 个答案: