rails - error loading "new" page made with ruby on rails scaffolding -

i have simple rails app devise set , profile model created. have set associations , seems fine, when try access new_profile_path new user account, following error:

nomethoderror in profilescontroller#new undefined method `build' nil:nilclass

extracted source (around line #17): 15 16 17 18 19 20

def new @profile = current_user.profile.build respond_with(@profile) end

the problem seems in profiles controller, cant seem figure out issue. entire code profiles controller:-

class profilescontroller < applicationcontroller    before_action :authenticate_user!    before_action :set_profile, only: [:show, :edit, :update, :destroy]      respond_to :html      def index  @profiles = profile.all  respond_with(@profiles)    end      def show  respond_with(@profile)    end      def new  @profile = current_user.build_profile  respond_with(@profile)    end      def edit    end      def create  @profile = current_user.build_profile(profile_params)  @profile.save  respond_with(@profile)    end      def update  @profile.update(profile_params)  respond_with(@profile)    end      def destroy  @profile.destroy  respond_with(@profile)    end      private  def set_profile    @profile = profile.find(params[:id])  end    def profile_params    params.require(:profile).permit(:name, :civil, :email, :level, :employment_date, :mobile, :folder, :title, :internal, :nationality, :vacation, :work_email, :experience)  end  end

my html link:-

<nav>     <ul>          <li><%= link_to root_path %>                 <i class="fa fa-home"></i>main             <% end %>         </li>         <% if !current_user.profile.blank? %>           <li><%= link_to profile_path(current_user.profile.id) %>              <i class="fa fa-user"></i>employee profile<i class="fa fa-sort-desc"></i>           <% end %>           <% else %>                 <li><%= link_to new_profile_path %><i class="fa fa-user-plus"></i>create profile</li>                 <% end %>           <% end %>                 <ul>                     <li><%= link_to "tasks / activities", tasks_path %></li>                     <li><%= link_to "vacations", vacations_path %></li>                 </ul>          </li>          <li><%= link_to projects_path %>                 <i class="fa fa-building-o"></i>projects<i class="fa fa-sort-desc"></i>                 <% end %>             <ul>                 <li><%= link_to active_path %>active projects<i class="fa fa-caret-right"></i>                     <% end %>                     <ul>                         <li><%= link_to "preliminary stage", presignature_path %></li>                         <li><%= link_to "design stage", develop_path %></li>                         <li><%= link_to "tendered stage", proposed_path %></li>                     </ul>                 </li>                 <li><%= link_to "archive", archive_path %></li>             </ul>          </li>        <li><%= link_to project_docs_path %>         <i class="fa fa-folder-open"></i>project documents<i class="fa fa-sort-desc"></i>         <% end %>             <ul>                 <li><%= link_to "preliminary stage", presignature2_path %></li>                 <li><%= link_to development2_path %>design stage<i class="fa fa-caret-right"></i>                     <% end %>                     <ul>                         <li><%= link_to "phase 1", phase1_path %></li>                         <li><%= link_to "phase 2", phase2_path %></li>                         <li><%= link_to "phase 3", phase3_path %></li>                         <li><%= link_to "phase 4", phase4_path %></li>                     </ul>                 </li>                 <li><%= link_to "tendered projects", proposed2_path %></li>             </ul>        </li>        <li><%= link_to search_path %>         <i class="fa fa-search"></i>search         <% end %>        </li>        <li><%= link_to reports_path %>         <i class="fa fa-file-text-o"></i>reports         <% end %>        </li>        <li><%= link_to feedback_path %>         <i class="fa fa-comment-o"></i>feedback         <% end %>        </li>     </ul> </nav> 

my profile model:

class profile < activerecord::base  	belongs_to :user  end

my user model:-

class user < activerecord::base    # include default devise modules. others available are:    # :confirmable, :lockable, :timeoutable , :omniauthable    devise :database_authenticatable, :registerable,           :recoverable, :rememberable, :trackable, :validatable      has_one :profile  end

i hope issue clear enough. in advance!

update:-

after updating profile controller code 1 above, receiving new error:

actioncontroller::urlgenerationerror in profiles#new

no route matches {:action=>"show", :controller=>"profiles", :id=>nil} missing required keys: [:id]

extracted source (around line #8): 5 6 7 8 9 10 11

            <% end %>         </li>         <% if !current_user.profile.blank? %>          <li><%= link_to profile_path(current_user.profile) %>         <i class="fa fa-user"></i>employee profile<i class="fa fa-sort-desc"></i>      <% end %>             <% else %> 

its says there problem line:

<%= link_to profile_path(current_user.profile) %>

current_user not yet have profile, can't call build on it. think want is:

@profile = current_user.build_profile 

this auto-generated method rails provides you. documentation little dense, here is. this might little more readable.