not able to persist username using twitter omni-auth in ruby on rails application -

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i trying implement omniauth twitter authenticate user using twitter in application. when try "login twitter", takes me "authorize app" twitter page. when click "authorize app" button, tries redirect me app , shows me as logged user in twitter.( logged in twitter in tab of browser). display me registration page without persisting username. following ryan http://railscasts.com/episodes/235-devise-and-omniauth-revised devise omniauth. how persist username when log in twitter. please suggest me.

i have attached application code on below link.

app code

please let me know if need more code pasted.

i had same problem. devise looking email. can't persisted without.

you can :
- change email field null=>true using migration
- generate dummy email when provider twitter


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