current_path_with_merged_parameters

# Return the current path with its query parameters, merging the passed parameters over any existing ones
# Include an :exclude key to remove the named existing parameter keys before merging
#
# Examples:
#
# # From http://localhost:3000/ncaab
# current_path_with_merged_parameters(:offset => 1)
# => "/ncaab?offset=1"
#
# # From http://localhost:3000/ncaab?offset=1
# current_path_with_merged_parameters(:offset => 2, :conference => 'poop')
# => "/ncaab?offset=2&conference=poop"
#
# # From http://localhost:3000/ncaab?offset=2&conference=poop
# current_path_with_merged_parameters(:offset => 0, :exclude => 'conference')
# => "/ncaab?offset=0"
def current_path_with_merged_parameters(params = {})
  params.stringify_keys!
  exclusions = Array(params.delete('exclude'))
  current_params = (exclusions.any? ? request.query_parameters.excluding(exclusions) : request.query_parameters)
  (request.path + '?' + current_params.merge(params).to_param).chomp('?')
end

module ActionController
  class AbstractRequest    
    def query_parameters_excluding(*keys)
      params = query_parameters.dup
      keys.flatten.each do |key|
        params.delete(key)
      end
      params
    end
  end
end