Deprecation warnings from Rails 4

[evizitei]

DEPRECATION WARNING: Relation#update_all with conditions is deprecated. Please use Item.where(color: 'red').update_all(...) rather than Item.update_all(..., color: 'red'). (called from do_after_save at /Users/ethanvizitei/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/bundler/gems/tandem-ff9b8cb58e13/app/models/tandem/page.rb:38)

DEPRECATION WARNING: This dynamic method is deprecated. Please use e.g. Post.find_or_create_by(name: 'foo') instead. (called from block in tandem_content_tag at /Users/ethanvizitei/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/bundler/gems/tandem-ff9b8cb58e13/app/helpers/tandem/pages_helper.rb:90)