Allow user to have non-lowercase names

Login still works regardless of case!

app/models/user.rb

@@ -19,6 +19,17 @@ class User < ApplicationRecord
 
   after_initialize :set_avatar_color
 
+  # Custom method to allow user to sign-in with any case while still storing the "correct" case in the database
+  def self.find_for_database_authentication(warden_conditions)
+    conditions = warden_conditions.dup
+    if (login = conditions.delete(:name))
+      where(conditions.to_h).where(["lower(name) = :value", { value: login.downcase }]).first
+    else
+      logger.warn("Authentication did not query :name as expected, login will only work with exact case!")
+      where(conditions.to_h).first
+    end
+  end
+
   def errors
     super.tap { |errors| errors.delete(:password, :blank) if password.nil? }
   end

config/initializers/devise.rb

@@ -58,12 +58,12 @@ Devise.setup do |config|
   # Configure which authentication keys should be case-insensitive.
   # These keys will be downcased upon creating or modifying a user and when used
   # to authenticate or find a user. Default is :email.
-  config.case_insensitive_keys = [:name]
+  config.case_insensitive_keys = [:email]
 
   # Configure which authentication keys should have whitespace stripped.
   # These keys will have whitespace before and after removed upon creating or
   # modifying a user and when used to authenticate or find a user. Default is :email.
-  config.strip_whitespace_keys = [:name]
+  config.strip_whitespace_keys = [:email, :name]
 
   # Tell if authentication through request.params is enabled. True by default.
   # It can be set to an array that will enable params authentication only for the