Using Active Record find.

rubyonrails-talk
#1

User < ActiveRecord::Base
has_many :groups

Group < ActiveRecord::Base
belongs_to :user

I'm trying do do a look up to see if a particular user is already part
of a group.

Use the user has_many groups association to check if a user has any
groups.

user = User.find_by_email(email)
user.groups.blank?

Aaron