komagataのブログ

# config/routes.rb:
devise_for :users,
  controllers: {
    registrations: :registrations,
    omniauth_callbacks: 'users/identities'
  } do
    delete 'users/disconnect/:provider' => 'users/identities#disconnect_omniauth_provider', as: 'disconnect_omniauth_provider'
end

$ rake spec
(...)
DEPRECATION WARNING: Passing a block to devise_for is deprecated. Please remove the block from devise_for (only the block, the call to devise_for must still exist) and call devise_scope :user do ... end with the block instead. (called fr)

上記のようにdevise_forにblockを渡すスタイルはDEPRECATEDになった。

# config/routes.rb:
devise_for :users, controllers: {
  registrations:      :registrations,
  omniauth_callbacks: 'users/identities'
}

devise_scope :user do
  delete 'users/disconnect/:provider' => 'users/identities#disconnect_omniauth_provider',
    as: 'disconnect_omniauth_provider'
end

こんな感じでblockに渡してた部分はdevise_scopeを使うといいらしい。