# Sends a message to the user over the feedback system. Will use jGrowl in frontend.
def feedback(msg)
	# Case 1: nil or empty string or empty array
	if flash[:alert].nil? || flash[:alert].to_s.strip.length == 0
		flash[:alert] = [msg]
	# Case 2: array
	elsif flash[:alert].kind_of?(Array)
		flash[:alert].push(msg)
	# Case 3: contains a string
	else
		str = flash[:alert]
		flash[:alert] = [str, msg]
	end
end

# Converts all errors of a model to feedback messages
def errors_to_feedback(model)
	model.errors.each do |error, message|
		feedback message
	end
end