Member e Roles

member.rb

class Member < ActiveRecord::Base
  
  has_many :roles

  devise :database_authenticatable, :async, :registerable,
         :recoverable, :rememberable, :trackable, :validatable, :confirmable

  def manager?
    (false if self.role == 0) || true
  end

  def managed_members
    false if self.manager? == false
    false if self.roles.count == 0

    ids = []
    self.roles.collect {|i| ids << i.managed_id}
    self.class.where(id: ids).order('id DESC').load
  end

end

role.rb

class Role < ActiveRecord::Base

  belongs_to :member

end

cara acho que isso:

def manager?
  (false if self.role == 0) || true
end

tu pode trocar só por isso:

def manager?
  self.role == 0
end

Se a role for igual a 0, ele vai retornar true, se não for, vai retornar false