how can I write a case-insensitive find_by_email for Rails 3

Question

I found that if a user registers with an email and use a capital letter in their email when I do the following I get nil.

Example:

username = Dillan@example.com

params[:user][:email] = dillan@example.com


user = User.find_by_email(params[:user][:email])

user.nil?  

=> true

How can I search for an email without the problems of case sensitivity or how an I write a find_by_email that is case insensitive?

Answer 1

If a user(say X) has an email 'Dillan@example.com', then

User.find(:all, :conditions => ["lower(email) =?", "dillan@example.com"]) 

should return the user X. I didnt replicate the situation but that is what I guess you essentially need to do.

Or, more better, use where instead of find as pointed out by @MrTheWalrus

User.where('lower(email) = ?', "dillan@example.com").first