ruby on rails - Either login form on every page or form that redirects to page -

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in rails app, there lot of pages don't require signed in view. example, profile page of user. current session logic redirects previous page if page requires signed in. if doesn't though, profile page, , click sign in , sign in, takes url specified in sessionscontroller action. brings me crossroads. either need modal on every page (in layouts/application.html.erb) has sessions form user can click sign in, model open, , when sign in refreshes page pretty user can stay on current page. however, i'm trying , getting few errors. other option have individual login page no matter page come within app, redirect to. unfortunately, i'm not sure how write code this.

here code have i'm trying have session form on every page through modal.

**sessionscontroller #create action**  def create   user = user.find_by(email: params[:session][:email].downcase)   if user && user.authenticate(params[:session][:password])     sign_in user     redirect_back_or request.original_url   else     flash.now[:error]  = "invalid email/password combination."     render 'new'   end end  **layouts/application.html.erb**  <% unless signed_in? %> ...modal code   <%= form_for(:session, url: sessions_path) %>       <%= text_field ... %>       <%= password_field .... %>       <%= submit button %>   <% end %> ... # i've shorted code here <% end %>

this form works fine on /login page: match '/login', to: "sessions#new", via: "get"

however, when use form on other pages, error:

`missing template public/error {:locale=>[:en], :formats=>[:html], :handlers=>[:erb, :builder, :raw, :ruby, :jbuilder, :coffee]}. `

and page goes :

http://localhost:3000/sessions

how can make sessions form work on every page of site?? thanks

update

after playing more, realized form works when change code in sessioncontroller 

redirect_back_or profile_path(user)

instead of current

redirect_back_or request.original_url

how can redirect current page i'm on instead of specifying specific page profile page???

i think found answer. please still answer if have better solution.

redirect_back_or :back

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