Question

I have this query and I have an error:

images = Image.find_by_sql('PREPARE stmt FROM \'
  SELECT *
  FROM images AS i
  WHERE i.on_id = 1 AND i.on_type = "profile"
  ORDER BY i.updated_at
  LIMIT ?, 6\
'; SET @lower_limit := ((5 DIV 6) * 6);  EXECUTE stmt USING @lower_limit;')

Mysql::Error: You have an error in
your SQL syntax; check the manual that
corresponds to your MySQL server
version for the right syntax to use
near ‘SET @lower_limit := ((5 DIV 6) *
6); EXECUTE stmt USING @lower_limit’
at line 1: PREPARE stmt FROM ‘ SELECT
* FROM images AS i WHERE i.on_id = 1 AND i.on_type = “profile” ORDER BY
i.updated_at LIMIT ?, 6’; SET
@lower_limit := ((5 DIV 6) * 6);
EXECUTE stmt USING @lower_limit;

EDIT:
after finding the answer to: MySQL: I need to get the offset of a item in a query i need another help here to port it to rails.

Answer 1

I suspect that you might not be allowed to use semicolon-delimited query sets in find_by_sql. Try finding a way to just use the happy Rails find method (see @Sleepycat’s answer, for example).