Rails - Nov 2011 - setting params[:token] with Devise

I''m trying to implement Devise but new to it.

When I request .../api/v1/projects.json, I get ''undefined method
admin? for nil:NilClass'', which I''m assuming happens because
params[:token] is not being set.  See below for code snippets -- does
anyone know how/where to set params[:token] with Devise?


class Api::V1::ProjectsController < Api::V1::BaseController
  def index
    respond_with(Project.for(current_user))
  end
end

--

class Project < ActiveRecord::Base
  ...

  def self.for(user)
    user.admin? ? Project : Project.readable_by(user)
  end
end

--

class User < ActiveRecord::Base
  before_save :ensure_authentication_token

 
devise :database_authenticatable, :registerable, :token_authenticatable,
         :recoverable, :rememberable, :trackable, :validatable, :confirmable
  ...

end

--

class Api::V1::BaseController < ActionController::Base
  before_filter :authenticate_user

  respond_to :json

  private

    def authenticate_user
      @current_user User.find_by_authentication_token(params[:token])
    end

    def current_user
      @current_user
    end

end

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