Rails存在？不区分大小写

Question

Model.exists?("lower(email) = ?", params[:email].downcase)

Returns error: ArgumentError (wrong number of arguments (2 for 0..1)):

Is it possible to do a exists? with a case insensitive match?

Answer 1

All you need to do is this:

Model.exists?(["lower(email) = ?", params[:email].downcase])

It's looking for a single argument but you're providing two. Using the array form and the find-style conditional should get what you need.

Answer 2

你也可以这样做：

Model.where("lower(email) = ?",params[:email].downcase).exists?