Geocoding only occurs avec address has changed

app/models/event.rb

@@ -27,8 +27,9 @@ class Event < ActiveRecord::Base
   validates :submitter, email: true
 
   geocoded_by :full_address
-  # after_validation :geocode, if: -> (obj) { obj.address_changed? }
-  after_validation :geocode
+  after_validation :geocode, if: (lambda do |obj|
+    obj.address_changed? || obj.city_changed?
+  end)
 
   # Mechanism to store some reason which can be used when sending notifications
   attr_accessor :reason

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20161210105333) do
+ActiveRecord::Schema.define(version: 20161210154558) do
 
   create_table "active_admin_comments", force: :cascade do |t|
     t.string   "namespace",     limit: 255
@@ -70,7 +70,7 @@ ActiveRecord::Schema.define(version: 20161210105333) do
     t.string   "contact",           limit: 255,   default: "", null: false
     t.string   "submitter",         limit: 255,   default: "", null: false
     t.integer  "moderated",         limit: 4,     default: 0,  null: false
-    t.text     "tags",              limit: 255,   default: "", null: false
+    t.text     "tags",              limit: 255,   default: ""
     t.string   "secret",            limit: 255,   default: "", null: false
     t.datetime "decision_time"
     t.datetime "submission_time"
@@ -124,7 +124,7 @@ ActiveRecord::Schema.define(version: 20161210105333) do
     t.datetime "created_at"
     t.datetime "updated_at"
     t.text     "tag"
-    t.text     "tags",                        default: "",    null: false
+    t.text     "tags",                        default: ""
     t.text     "diaspora"
     t.text     "object_changes"
     t.text     "place_name"