cancan - Fetch record based on role rails -

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i using devise , cancan projects , works fine. there users table in database. there 3 types of role 

->admin ->publishers ->players

now want fetch record users table expect admin's record.

i little confused how this.

if role string in user table:

scope :with_role, lambda{|role_name| where(:role => role_name) }

if user belongs_to role:

scope :with_role, lambda{|role_name| includes(:role).where(:roles => {:title => role_name}) }

and can fetch admins:

user.with_role('admin')

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