all fields are required

app/assets/stylesheets/application.sass

@@ -18,3 +18,8 @@
 
 body
   padding-top: 20px
+  
+  #new_supporter
+    label.required
+      abbr
+        display: none

app/controllers/supporters_controller.rb

@@ -18,6 +18,6 @@ class SupportersController < ApplicationController
   private
 
   def supporter_form_params
-    params.require(:supporter).permit(:first_name, :last_name, :street, :zip, :email, :support, :age_category)
+    params.require(:supporter).permit(:first_name, :last_name, :street, :zip, :email, :support, :age_category, :city)
   end
 end

app/models/supporter.rb

@@ -11,6 +11,11 @@ class Supporter
   field :support,      type: String # Indicates the type of support
   field :age_category, type: String
 
+  validates :first_name,   presence: true
+  validates :last_name,    presence: true
+  validates :street,       presence: true
+  validates :zip,          presence: true
+  validates :city,         presence: true
   validates :email,        presence: true, uniqueness: true
   validates :support,      presence: true
   validates :age_category, presence: true

spec/features/support_spec.rb

@@ -11,7 +11,6 @@ feature 'Support announcement' do
     fill_in 'Postleitzahl', with: '8704'
     fill_in 'Ort', with: 'Hinterm Mond'
     fill_in 'E-Mail', with: 'blocher@blocher.ch'
-    fill_in 'E-Mail', with: 'blocher@blocher.ch'
 
     choose 'Ich unterschreibe eine Volksinitiative für die Freigabe von Cannabis und helfe aktiv Unterschriften in meiner Umgebung zu sammeln.'
 
@@ -26,7 +25,7 @@ feature 'Support announcement' do
     click_button 'Unterstützung zusichern'
 
     expect(page).to have_content 'Ihre Eingabe war zu schnell.'
-    
+
     # Test twice just to be sure that it's not become an update action
     click_button 'Unterstützung zusichern'
 

spec/models/supporter_spec.rb

@@ -1,7 +1,13 @@
 require 'rails_helper'
 
 describe Supporter do
+  it { is_expected.to validate_presence_of(:first_name) }
+  it { is_expected.to validate_presence_of(:last_name) }
+  it { is_expected.to validate_presence_of(:street) }
+  it { is_expected.to validate_presence_of(:zip) }
+  it { is_expected.to validate_presence_of(:city) }
   it { is_expected.to validate_presence_of(:email) }
   it { is_expected.to validate_uniqueness_of(:email) }
   it { is_expected.to validate_presence_of(:support) }
+  it { is_expected.to validate_presence_of(:age_category) }
 end