Change visit_id type of ahoy_events to integer

The id column of the visits table is of type integer

db/migrate/20171118113113_change_visit_id_type_of_ahoy_events_to_integer.rb

@@ -0,0 +1,5 @@
+class ChangeVisitIdTypeOfAhoyEventsToInteger < ActiveRecord::Migration[5.0]
+  def change
+    change_column :ahoy_events, :visit_id, :integer, limit: nil
+  end
+end

db/schema.rb

@@ -10,10 +10,10 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170924190528) do
+ActiveRecord::Schema.define(version: 20171118113113) do
 
   create_table "ahoy_events", force: :cascade do |t|
-    t.binary   "visit_id",   limit: 16
+    t.integer  "visit_id"
     t.integer  "user_id"
     t.string   "name"
     t.text     "properties"