ruby on rails - undefined local variable or method `template_params' for TemplatesController:Class -

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i tried create model named template, when tried open localhost:3000/templates/new, got undefined method error in templatescontroller, private method doesn't work, why?

templates controller:

class templatescontroller < applicationcontroller   def new     @template = template.new     4.times { @template.fields.build}   end    def edit     @template = template.find(params[:id])   end    def show     @template = template.find(params[:id])   end    def create     @template = template.new(template_params)     if @template.save       redirect_to root_path     end   end    def update   end    private    def template_params     params.require(:template).permit(:name, fields_attributes: [:id, :name,:template_id])   end end

templates/new.html.erb:

<div class="container">   <%= form_for(@template) |f| %>     <%= f.label :name %>     <%= f.text_field :name %>     fields:     <ul>       <%= f.fields_for :fields |field| %>         <li>           <%= field.label :name %>           <%= field.text_field :name %>         </li>       <% end %>     </ul>   <% end %> </div>

error:

actioncontroller::routingerror (undefined local variable or method `template_params' templatescontroller:class):  app/controllers/templates_controller.rb:27:in `<class:templatescontroller>' app/controllers/templates_controller.rb:1:in `<top (required)>'   rendering /users/xi/.rvm/gems/ruby-2.2.2/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/routing_error.html.erb within rescues/layout   rendering /users/xi/.rvm/gems/ruby-2.2.2/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb


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