How can I get devise to add a username with rails 5 -


there previous posts discussing how add username devise model. unfortunately, these posts not discuss how setup views. mainly, i'm interested in updating 

devise/registrations/edit.html.erb

file. in it, have added following lines

<div class="field">   <%= f.label :username %><br />   <%= f.text_field :username %> </div>

to allow users update username. unfortunately, when save form, username not update. why happening?

i checked comment above, if want update user can use user controller (not device registration) , below code user controller 

class userscontroller < applicationcontroller    def edit     @user = user.find(params[:id])   end    def update     # devise     if params[:user][:password].blank?       params[:user].delete(:password)       params[:user].delete(:password_confirmation)     end     @user = user.find(params[:id])     if @user.update_attributes(user_params)       flash[:success] = 'user changed'       sign_out_and_redirect(@user)       # push user sign out     else       flash[:error] = @user.errors.full_messages[0]       redirect_to users_path     end   end    private    # white list parameter    def user_params     params.require(:user).permit(       :username,        :password,        :password_confirmation,        :email   end end

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