How to “count” user inputs from a Controller

问题

I have a @shows Controller where every user can create a Show (Singular).

On the Show Creation View (shows/new) i want to display a counter of how many shows there are already.

i tried:

def count
  @shows.all.count
end
# in my Shows Controller

and then called <%= @count %> on my view. But i guess this isn't the right way.

I tried calling it directly on my View:

<%= @shows.count %>

but neither this worked.

Can someone help me out ?

回答1:

@show_count = Show.count will do your job.

In your view <%= @show_count%>

回答2:

You need to create the @count variable in your new method in the controller or use a helper method from your view

controller version

def new
    # your other code here

    @count = Shows.count
    # @count is now available in your view for `new`
end

You could always simply call <%= @shows.count %> inside your view. Yes, you should only do minimal code stuff in your view but this is just a simple call, not a method chain doing complex things, so it's alright to do that.

With the code given, I cannot say why @shows.count didn't work for you in the view. Maybe you forgot to add the .all in your controller?

来源：https://stackoverflow.com/questions/18764418/how-to-count-user-inputs-from-a-controller