Rails - Aug 2014 - user -notes relationship

i have 2 models
class User < ActiveRecord::Base
  has_many :notes, :dependent => :destroy
  accepts_nested_attributes_for :notes
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

end


class Note < ActiveRecord::Base
  belongs_to :user
  validates :content, presence: true,length: { minimum: 15 }

end

the database schema

create_table "notes", primary_key: "note_id", force: true do
|t|
    t.text    "content"
    t.integer "user_id"
  end



create_table "users", primary_key: "user_id", force: true do
|t|
    t.string   "first_name"
    t.string   "last_name"
    t.string   "email",                  default: "",   
null: false
    t.string   "encrypted_password",     default: "",   
null: false
    t.string   "reset_password_token"
    t.datetime "reset_password_sent_at"
    t.datetime "remember_created_at"
    t.integer  "sign_in_count",          default: 0,     null: false
    t.datetime "current_sign_in_at"
    t.datetime "last_sign_in_at"
    t.string   "current_sign_in_ip"
    t.string   "last_sign_in_ip"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.boolean  "admin",                  default: false
  end

this is my method for saving notes
def save_note
    @note = Note.new(lesson_params)

    if @note.save
       flash[:notice] = "You have successfully add a lesson."
       redirect_to pages_home_url
    else
       flash[:notice] = "Failed."
       redirect_to pages_home_url
    end
  end


  private

  def lesson_params
    params.require(:note).permit(
      :content)
  end
end

when i save a note isn't put in my database the user_id and I don't know
why...I have to extract the curent user_id and i don't preaty much kknow
how to do it. Also, i check in console and this i get :" INSERT INTO
`notes` (`content`) VALUES ('asdasd asdakshdasmd ')". It seems like
my
user_id isn't inserted in db. i came from another world called php and
there the things are different.

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