Queries sponsors only once on new event

Author: gnclmorais

app/views/admin/events/_form.html.haml

@@ -1,4 +1,5 @@
 :ruby
+  all_sponsors = Sponsor.all
   all_managers = Member.manager.sort_alphabetically
 
 = simple_form_for [:admin, @event] do |f|
@@ -37,13 +38,13 @@
       %p
         %strong Please add sponsors only to either Standard level OR Gold/Silver/Bronze levels.
     .col-12
-      = f.association :sponsors, label: 'Standard sponsors', input_html: { data: { placeholder: 'Select standard sponsors' }}, collection: Sponsor.all
+      = f.association :sponsors, label: 'Standard sponsors', input_html: { data: { placeholder: 'Select standard sponsors' }}, collection: all_sponsors
     .col-12.col-md-6.col-lg-4
-      = f.association :bronze_sponsors, input_html: { data: { placeholder: 'Select bronze sponsors' }}, collection: Sponsor.all
+      = f.association :bronze_sponsors, input_html: { data: { placeholder: 'Select bronze sponsors' }}, collection: all_sponsors
     .col-12.col-md-6.col-lg-4
-      = f.association :silver_sponsors, input_html: { data: { placeholder: 'Select silver sponsors' }}, collection: Sponsor.all
+      = f.association :silver_sponsors, input_html: { data: { placeholder: 'Select silver sponsors' }}, collection: all_sponsors
     .col-12.col-md-6.col-lg-4
-      = f.association :gold_sponsors, input_html: { data: { placeholder: 'Select gold sponsors' }}, collection: Sponsor.all
+      = f.association :gold_sponsors, input_html: { data: { placeholder: 'Select gold sponsors' }}, collection: all_sponsors
     .col-12
       = f.input :organisers, collection: all_managers, value_method: :id, label_method: :full_name, selected: @event.organisers.pluck(&:id), input_html: { multiple: true }
     .col-12