module Devise::Controllers::StoreLocation

def add_fragment_back_to_path(uri, path) 

def add_fragment_back_to_path(uri, path)
  [path, uri.fragment].compact.join('#')
end

def extract_path_from_location(location) 

def extract_path_from_location(location)
  uri = parse_uri(location)
  if uri 
    path = remove_domain_from_uri(uri)
    path = add_fragment_back_to_path(uri, path)
    path
  end
end

def parse_uri(location) 

def parse_uri(location)
  location && URI.parse(location)
rescue URI::InvalidURIError
  nil
end

def remove_domain_from_uri(uri) 

def remove_domain_from_uri(uri)
  [uri.path.sub(/\A\/+/, '/'), uri.query].compact.join('?')
end

def store_location_for(resource_or_scope, location)


redirect_to user_facebook_omniauth_authorize_path
store_location_for(:user, dashboard_path)

Example:

Useful in combination with the `stored_location_for` helper.
Stores the provided location to redirect the user after signing in. 
def store_location_for(resource_or_scope, location)
  session_key = stored_location_key_for(resource_or_scope)
  
  path = extract_path_from_location(location)
  session[session_key] = path if path
end

def stored_location_for(resource_or_scope)


redirect_to stored_location_for(:user) || root_path

Example:

the given scope. Useful for giving redirect backs after sign up:
Returns and delete (if it's navigational format) the url stored in the session for 
def stored_location_for(resource_or_scope)
  session_key = stored_location_key_for(resource_or_scope)
  if is_navigational_format?
    session.delete(session_key)
  else
    session[session_key]
  end
end

def stored_location_key_for(resource_or_scope) 

def stored_location_key_for(resource_or_scope)
  scope = Devise::Mapping.find_scope!(resource_or_scope)
  "#{scope}_return_to"
end