find_by_sql失敗，出現異常：參數個數錯誤

Question

在以下代碼中，find_by_sql失敗，出現異常：參數個數錯誤（0代表1）。 任何想法發生了什麼？

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

嘗試增加括號：

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]) 

Answer 2

你寫它的方式，你想不帶任何參數來執行的find_by_sql，然後調用結果[]操作（但失敗了你有之前那麼遠）。

您需要在「[」之前的空格。爲了更加清楚，我會在數組參數「... find_by_sql（[...]）」周圍加上括號。