Question

Are rails SQL queries actually compatible with datetimes?

For example, if I do:

User.where("email LIKE ?", "%.com%")

I would expect to (and do) get back a list of all users with a “.com” email address.

However, if I do:

User.where("created_at LIKE ?","%2011%")

I get back nothing, even though I can see that there are users created this year. In point of fact, sometimes i get gibberish back (for example, I might get stuff (with seemingly nothing in common) back for %20%, but nothing back for %30% even though I know there are dates with a 30 in them), which makes me think the “LIKE” is applying to something I don’t see/care about (maybe some sort of ID?)

Are LIKES for string only? Is there some way I can do something similar for date times, in rails (I’m sure there’s some way to do it in mysql, but can rails also handle it?)

Specifically, I want to use this in a scope, similar to:

 scope :by_date, lambda {|date| where("created_at LIKE ?",date)}

Answer 1

IIRC, datetime values are stored as integers.
LIKE operator works on strings.

You can try using CONVERT() or CAST() or even CONCAT().

Something like:

 CONVERT(created_at, VARCHAR(20))