Add required column for Doorkeeper 5

db/migrate/20181013195028_add_confidential_to_applications.rb

@@ -0,0 +1,5 @@
+class AddConfidentialToApplications < ActiveRecord::Migration
+  def change
+    add_column :oauth_applications, :confidential, :boolean, null: false, default: true
+  end
+end

db/schema.rb

@@ -298,6 +298,7 @@ ActiveRecord::Schema.define(version: 20181201000000) do
     t.string   "scopes",       limit: 255,   default: "",   null: false
     t.datetime "created_at"
     t.datetime "updated_at"
+    t.boolean  "confidential",               default: true, null: false
   end
 
   add_index "oauth_applications", ["uid"], name: "index_oauth_applications_on_uid", unique: true, using: :btree