Method: Hash#to_rel_attr

Defined in:
lib/html_attributes/hash.rb

#to_rel_attr ⇒ Object

Returns a string containing the rel values whose conditions are neighter false nor nil, or returns nil if no rel values remains.

Examples

{ :nofollow => true, :other => false, :me => true }.to_rel_attr
# => "nofollow me"

{ :foo => false, :bar => false }.to_rel_attr
# => nil



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# File 'lib/html_attributes/hash.rb', line 32

def to_rel_attr
  self.select { |klass, condition| condition }.           # remove rel values with nil or false condition
       map { |elem| elem.first.to_s }.                    # throw condition away
       sort.                                              # sort alphabetically
       to_rel_attr                                        # join with ' ' or return nil if empty
end