Rails 6：仅当我使用我的控制器中的方法时才渲染部分内容

Question

I have a Users controller, with index , show , edit and destroy methods. In my layouts/ folder, I have a general-purpose user.html.erb layout that renders some partials. These partials are of course producing errors due some of the info isn't available, like @user.name , for example. I've tried to render that partial always when I'm in a def show state, something like:

<% if Users.show %>
<% render "shared/asides/users" %>
<% else %>
Other partials
<% end %>

I've tried several ways and I always get errors. I feel totally lost even trying to find out this on the Rails documentation nothing seems to be indicated there too.

Answer 1

Your problem is, as you say, you're trying to display things associated with a user, like @user.name, but there is no @user.

So why not check for @user before showing the partial? Or if you have a collection of users, I'm guessing @users?

<% if @users %>
  <%= render "shared/asides/users" %>
<% else %>
  <%= Do something else %>
<% end %>

Of maybe a bit neater:

<%= render (@users ? path/to/partial_a.html.erb : path/to/partial_b.html.erb) %>

Answer 2

You can make a special layout for your action. Then, at the end of action add layout to render.

def show
  ...
  render layout: "custom_layout"
end