Can't persist Devise user with Rails 4 Omniauth & Tumblr

Question

Seems like I'm not the only person who has had this issue with other OAuth providers & Devise. I'm trying to authenticate a user with their Tumblr account, store their nickname as the user's username, and store their oauth token & secret so my app can automatically post to Tumblr when they take certain actions.

I've followed various, articles, about, omniauth, and devise (my code is based of the Railscast #235 episode), but I can't quite get the user's data stored in the database. The first user who tries to authenticate "works" fine (it creates a username, but nothing else), but any further users who try to login/authenticate, always get assigned that first user's credentials (and no entry in the database).

I'm using Rails 4.0.0 and Ruby 2.0.0-p195. Do I need to do something with Strong Parameters?

Something is going on behind the scenes with no error messages, and I just don't know how to figure out where to look. Here's my code:

# user.rb
def self.from_omniauth(auth)
    if user = User.find_by_username(auth.info.name)
      user.provider = auth.provider
      user.uid = auth.uid
      user
    else
      where(auth.slice(:provider, :uid)).first_or_create do |user|
        user.provider = auth.provider
        user.uid = auth.uid
        user.username = auth.info.nickname
        user.oauth_token = auth.info.credentials.token
        user.oauth_token_secret = auth.info.credentials.secret
      end
    end
  end

My controller (basically identical to every other tutuorial I've read)

class OmniauthCallbacksController < Devise::OmniauthCallbacksController

  def tumblr
    user = User.from_omniauth(request.env["omniauth.auth"])
    if user.persisted?
      flash.notice = "Signed in Through Tumblr!"
      sign_in_and_redirect user
    else
      session["devise.user_attributes"] = user.attributes
      # flash.notice = "You are almost Done! Please provide a password to finish setting up your account"
      redirect_to root_url
    end
  end
end

If anyone has ANY insight into what I may be doing wrong, or even how to figure out how to figure out (I don't mind looking, just out of ideas), I'd really appreciate it.

Thanks!

Answer 1

It appears the answer was fairly simple, but absolutely nothing that I suspected. When I put the ! on my create method, I got an error about my Devise-created index in my User model named: index_users_on_email.

So I created this migration to remove it:

class RemoveIndexUsersOnEmailFromUsers < ActiveRecord::Migration
  def self.up
    remove_index(:users, :name => 'index_users_on_email')
  end

  def self.down
    add_index(:users, :name => 'index_users_on_email')
  end
end

Voila! Hope that helped someone.