refactor

app/controllers/sessions_controller.rb

@@ -14,7 +14,8 @@ class SessionsController < ApplicationController
     else
       signup = Signup.new(email_address: email_address)
       if signup.valid?(:identity_creation)
-        redirect_to_session_magic_link signup.create_identity
+        identity = signup.create_identity unless single_tenant?
+        redirect_to_session_magic_link identity
       else
         head :unprocessable_entity
       end

app/models/signup.rb

@@ -16,7 +16,6 @@ class Signup
   end
 
   def create_identity
-    return if single_tenant?
     @identity = Identity.find_or_create_by!(email_address: email_address)
     @identity.send_magic_link for: :sign_up
   end
@@ -97,8 +96,4 @@ class Signup
         attributes[:referrer]       = Current.referrer
       end
     end
-
-    def single_tenant?
-      ENV.fetch("SINGLE_TENANT", "false") == "true"
-    end
 end