Code to recursively clean a params hash.

gistfile1.rb

# Copyright (c) 2010,2011 Jonathan Stott
#
# Permission  is  hereby granted, free of charge, to any person ob-
# taining a copy of  this  software  and  associated  documentation
# files  (the "Software"), to deal in the Software without restric-
# tion, including without limitation the rights to use, copy, modi-
# fy, merge, publish, distribute, sublicense, and/or sell copies of
# the Software, and to permit persons to whom the Software is  fur-
# nished to do so, subject to the following conditions:
#
# The  above  copyright  notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF  ANY  KIND,
# EXPRESS  OR  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE  AND  NONIN-
# FRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER  IN  AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN  THE
# SOFTWARE.

def clean_params(param_set=params)
  case param_set
  when Array
    param_set.each do |v|
      if Array === v or Hash === v
        clean_params(v)
      end
    end
    param_set.delete_if { |v| v.strip!; v.empty? }
  when Hash
    param_set.each do |k, v|
      if Array === v or Hash === v
        clean_params(v)
      end
    end
    param_set.delete_if { |k, v| v.strip!; v.empty? }
  else
    param_set
  end
end