Perform the where(...).first to find_by(...) refactoring.

This refactoring was automated using the command: bundle exec "ruby refactorings/where_dot_first_to_find_by/app.rb"

lib/auth/default_current_user_provider.rb

@@ -24,7 +24,7 @@ class Auth::DefaultCurrentUserProvider
     current_user = nil
 
     if auth_token && auth_token.length == 32
-      current_user = User.where(auth_token: auth_token).first
+      current_user = User.find_by(auth_token: auth_token)
     end
 
     if current_user && (current_user.suspended? || !current_user.active)
@@ -53,7 +53,7 @@ class Auth::DefaultCurrentUserProvider
             raise Discourse::InvalidAccess.new if api_username && (api_key.user.username_lower != api_username.downcase)
             current_user = api_key.user
           elsif api_username
-            current_user = User.where(username_lower: api_username.downcase).first
+            current_user = User.find_by(username_lower: api_username.downcase)
           end
 
         end

lib/auth/facebook_authenticator.rb

@@ -17,10 +17,10 @@ class Auth::FacebookAuthenticator < Auth::Authenticator
 
     result.extra_data = facebook_hash
 
-    user_info = FacebookUserInfo.where(facebook_user_id: facebook_hash[:facebook_user_id]).first
+    user_info = FacebookUserInfo.find_by(facebook_user_id: facebook_hash[:facebook_user_id])
     result.user = user_info.try(:user)
 
-    if !result.user && !email.blank? && result.user = User.where(email: Email.downcase(email)).first
+    if !result.user && !email.blank? && result.user = User.find_by(email: Email.downcase(email))
       FacebookUserInfo.create({user_id: result.user.id}.merge(facebook_hash))
     end
 

lib/auth/github_authenticator.rb

@@ -19,7 +19,7 @@ class Auth::GithubAuthenticator < Auth::Authenticator
       github_screen_name: screen_name,
     }
 
-    user_info = GithubUserInfo.where(github_user_id: github_user_id).first
+    user_info = GithubUserInfo.find_by(github_user_id: github_user_id)
 
     if user_info
       user = user_info.user

lib/auth/oauth2_authenticator.rb

@@ -20,7 +20,7 @@ class Auth::OAuth2Authenticator < Auth::Authenticator
     result.email = email = data[:email]
     result.name = name = data[:name]
 
-    oauth2_user_info = Oauth2UserInfo.where(uid: oauth2_uid, provider: oauth2_provider).first
+    oauth2_user_info = Oauth2UserInfo.find_by(uid: oauth2_uid, provider: oauth2_provider)
 
     if !oauth2_user_info && @opts[:trusted] && user = User.find_by_email(email)
       oauth2_user_info = Oauth2UserInfo.create(uid: oauth2_uid,

lib/auth/twitter_authenticator.rb

@@ -21,7 +21,7 @@ class Auth::TwitterAuthenticator < Auth::Authenticator
       twitter_screen_name: screen_name
     }
 
-    user_info = TwitterUserInfo.where(twitter_user_id: twitter_user_id).first
+    user_info = TwitterUserInfo.find_by(twitter_user_id: twitter_user_id)
 
     result.user = user_info.try(:user)