ruby-on-rails - 検索フォームで自動ログアウトする工夫

Question

私のuser.rb

class User

include Mongoid::Document
  include Mongoid::MultiParameterAttributes
  include Mongoid::Timestamps

  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable,
  # :lockable, :timeoutable and :omniauthable

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

  ## Database authenticatable
  field :name,               :type => String, :default => ""
  field :gender
  field :mobnum,             :type => String, :default => ""

  field :area,              :type => String, :default => ""
  field :state,             :type => String, :default => ""
  field :ngo,             :type => String, :default => ""

  field :username,           :type => String, :default => ""
  field :email,              :type => String, :default => ""
  field :encrypted_password, :type => String, :default => ""

  # State fields

  ## Recoverable
  field :reset_password_token,   :type => String
  field :reset_password_sent_at, :type => Time

  ## Rememberable
  field :remember_created_at, :type => Time

  ## Trackable
  field :sign_in_count,      :type => Integer, :default => 0
  field :current_sign_in_at, :type => Time
  field :last_sign_in_at,    :type => Time
  field :current_sign_in_ip, :type => String
  field :last_sign_in_ip,    :type => String
  ## Confirmable
  # field :confirmation_token,   :type => String
  # field :confirmed_at,         :type => Time
  # field :confirmation_sent_at, :type => Time
  # field :unconfirmed_email,    :type => String # Only if using reconfirmable

  ## Lockable
  # field :failed_attempts, :type => Integer, :default => 0 # Only if lock strategy is :failed_attempts
  # field :unlock_token,    :type => String # Only if unlock strategy is :email or :both
  # field :locked_at,       :type => Time

  ## Token authenticatable
  # field :authentication_token, :type => String
  attr_accessible :name, :gender, :area, :state,:ngo,:mobnum, :username , :email ,:password ,:password_confirmation

  validates_presence_of :username
  validates_uniqueness_of :username

end  

私の家族と個人のレコードの検索フォームを備えたManagedbControllerがあります。検索アクション
は次 のようなものです。

def search
            if request.post?
                    if params[:dosearch1] 
                            searchHash = Hash.new
                            if params[:onoff1] && params[:onoff1]["famid"]&& params[:search][:famid]
                                    searchHash[:famid] = params[:search][:famid]

                                    fam  = Family.where(searchHash).first
                                    if fam 
                                        @r1 = fam.persons.paginate(:page => params[:page], :per_page => 50)
                                    else
                                        @r1 = Array.new
                                    end
                                    render :search
                                    return
                            else

                                    if params[:onoff1]
                                            params[:onoff1].each do |key,val|
                                                    searchHash[key] = params[:search][key]
                                            end
                                    end
                                    @r1 = Person.where(searchHash).paginate(:page => params[:page], :per_page => 50)
                                    render :search 
                                    return

                            end     


                    end
            else
                    render :search 
                    return
            end
    end  

また、私はbefore_filter :authenticate_user!**managedb コントローラーの上にあります

検索フォームのソースは次のとおりです。

<form method="post">    
    <fieldset><br>
       <input type="hidden" name="dosearch1" value="1">
         <input type="checkbox" name ="onoff1[famid]"><b><big> Family ID : </big></b><input type="text" name="search[famid]"><br>
         <input type="checkbox" name ="onoff1[name]"><b><big> Full name: </big></b><input type="text" name="search[name]"><br>
         <input type="checkbox" name ="onoff1[mobnum]"><b><big> Member mobile number: </big></b><input type="text" name="search[mobnum]"><br>
                        <br>
         <input type="submit" value ="Search" class="btn btn-success">
         <input type="button" value = "Back" onclick="javascript:window.location.href='/managedb'" class="btn btn-inverse">
    </fieldset>
</form>  

検索フォームの送信ボタンをクリックすると、デバイスがログアウトしてsign_inpageにリダイレクトします。

なぜこのようなことが起こっているのでしょうか? ヘルプ！！

ルート.rb

root to: "home#index"

devise_for :users

  match '/home', to: "home#home"
  match '/features', to: "home#features"
  match '/contact', to: "home#contact"
  match '/howtouse', to: "home#howtouse"

  match '/map', to: "managedb#map"
  match '/search', to: "managedb#search"

  match ':controller(/:action)'