ruby-on-rails,ruby,ruby-on-rails-4,model-view-controller , On rendering from controller, current_page method does not seem to work


On rendering from controller, current_page method does not seem to work

Question:

Tag: ruby-on-rails,ruby,ruby-on-rails-4,model-view-controller

I have a navigation bar included in application.html.erb. Because for some pages, such as the signup page, I need to place additional code inside the navigation bar, I have excluded those pages for showing the navigation bar through application.html.erb and instead included it in their respective view pages. See code below.

A problem arises when invalid data is entered in the signup form. The controller method then renders new. However, application.html.erb then doesn't seem to recognize that the current_page is still signup_path, therefore not applying the exception for not showing the navigation bar on that page. As a result when it renders new, the navigation bar is shown twice: once by order of application.html.erb and once by order of the view page itself.

Why, when rendering new on an invalid form entry, does it not see that it's still on signup_path? How should I adjust my code so that it does not show the navigation bar twice in that situation? Is there perhaps a way of including <%= yield special code if any %> in application.html.erb and <% special_code %> <% end special_code %> in the view page that passes this special code to application.html.erb?


In application.html.erb I have:

<% unless current_page?(signup_path) %>
  <nav class="banner">
    <%= render partial: "shared/header" %>
  </nav>
<% end %>

In the view of my signup page:

<nav class="banner">
    <%= render partial: "shared/header" %>
    Additional code that needs to be within 'nav' for this page
</nav>

Controller method:

def create
  @user = User.new(user_params)
  if @stakeholder.save
    flash[:success] = "A confirmation email has been sent to you."
    redirect_to root_url
  else                          
    render 'new'  ###This is where it goes wrong!
  end
end

Answer:

You can use content_for and yields to create a default in your layout which views can override.

# layouts/application.html.erb:
<% if content_for?(:banner) %>
  <%= yield(:banner) %>
<% else %>
  <div id="banner">
    <h1>This is the default...</h1>
  </div>
<% end %>

/users/signup.html.erb:
<%- content_for :banner, flush: true do -%>
  <!-- move along, nothing to see here -->
<%- end -%>

The advantage here is that you don't end up turning your layouts into a birds nest of conditionals. You can easily just inject whatever you want into the layout from views.

The cons are that you have to use a stupid hack with a HTML comment to override the block to display nothing since content_for? trims the block. content_for does not play nice with fragment catching either.

addded

I didn't touch on this before unless current_page?(signup_path) does not work as you expect since render 'new' does not magically move you to the new action. In fact the current_path is /users since the form POST's to that url.

It just tells rails to find a template named 'new' and render it.

A corrected version would be:

<% unless controller_name == 'users' && ['new', 'create'].include?( action_name) %>
  <nav class="banner">
   <%= render partial: "shared/header" %>
  </nav>
<% end %>

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