Gem

Gemfile

gem "devise"
gem "omniauth-facebook"
gem "fb_graph"

Deviseの場合

OmniAuthの設定に「status_update」と「publish_stream」を追加
- Facebook側の設定ページには権限の設定は無い、アプリ側で設定する(ハマった。。)

config/initializers/devise.rb

config.omniauth :facebook, Settings.facebook_id, Settings.facebook_secret, { scope: 'email, status_update, publish_stream' }

permissionsに「status_update」「publish_stream」が存在する事を確認

FbGraph::User.me(  current_user.facebook_token ).permissions.tapp
 # =>
[
    [0] :installed,
    [1] :read_stream,
    [2] :status_update,
    [3] :photo_upload,
    [4] :video_upload,
    [5] :email,
    [6] :create_note,
    [7] :share_item,
    [8] :publish_stream,
    [9] :publish_actions
]

ウォール投稿が成功する事を確認

    me = FbGraph::User.me( current_user.facebook_token )
    me.feed!(
      message:     'Updating via FbGraph',
      picture:     'https://graph.facebook.com/matake/picture',
      link:        'https://github.com/nov/fb_graph',
      name:        'FbGraph',
      description: 'A Ruby wrapper for Facebook Graph API'
    )