Upgrade to Rails 5.0.0.1

app/models/account.rb

@@ -1,10 +1,10 @@
-class Account < ActiveRecord::Base
+class Account < ApplicationRecord
   include Targetable
 
   # Local users
   has_one :user, inverse_of: :account
-  validates :username, uniqueness: { scope: :domain, case_sensitive: false }, if:     'local?'
-  validates :username, uniqueness: { scope: :domain, case_sensitive: true },  unless: 'local?'
+  validates :username, presence: true, uniqueness: { scope: :domain, case_sensitive: false }, if:     'local?'
+  validates :username, presence: true, uniqueness: { scope: :domain, case_sensitive: true },  unless: 'local?'
 
   # Avatar upload
   has_attached_file :avatar, styles: { large: '300x300#', medium: '96x96#', small: '48x48#' }, default_url: 'avatars/missing.png'

app/models/application_record.rb

@@ -0,0 +1,3 @@
+class ApplicationRecord < ActiveRecord::Base
+  self.abstract_class = true
+end

app/models/favourite.rb

@@ -1,4 +1,4 @@
-class Favourite < ActiveRecord::Base
+class Favourite < ApplicationRecord
   include Streamable
 
   belongs_to :account, inverse_of: :favourites

app/models/follow.rb

@@ -1,4 +1,4 @@
-class Follow < ActiveRecord::Base
+class Follow < ApplicationRecord
   include Streamable
 
   belongs_to :account

app/models/mention.rb

@@ -1,4 +1,4 @@
-class Mention < ActiveRecord::Base
+class Mention < ApplicationRecord
   belongs_to :account, inverse_of: :mentions
   belongs_to :status
 

app/models/status.rb

@@ -1,4 +1,4 @@
-class Status < ActiveRecord::Base
+class Status < ApplicationRecord
   include Paginable
   include Streamable
 

app/models/stream_entry.rb

@@ -1,4 +1,4 @@
-class StreamEntry < ActiveRecord::Base
+class StreamEntry < ApplicationRecord
   include Paginable
 
   belongs_to :account, inverse_of: :stream_entries

app/models/user.rb

@@ -1,4 +1,4 @@
-class User < ActiveRecord::Base
+class User < ApplicationRecord
   devise :database_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :validatable
 
   belongs_to :account, inverse_of: :user