local_assigns :
When using partial views in Rails (like _partial.html.erb), we might pass local variables to customize the rendering. However, if we try to use a local variable that wasn't passed, Rails will raise an error.
To avoid this, local_assigns is a special hash that helps check if a local variable was provided when rendering the partial. Instead of directly using <%= show_projects %>, which could cause an error if missing, we can safely check local_assigns[:show_projects] first.

<% if local_assigns[:show_projects] %> 
  

    <%= (render @user.projects) || (render 'shared/empty_state', message: "No projects found!") %>
  
 
<% end %>

Here, the partial checks if show_projects was passed before using it. If show_projects was provided, it renders the user's projects or a message if no projects are found. If show_projects wasn't passed, nothing happens, preventing errors.