Class: Hash

Inherits:
Object
  • Object
show all
Defined in:
lib/activerecord_postgres_hstore_core/hash.rb

Constant Summary collapse

HSTORE_ESCAPED = 
/[,\s=>\\]/

Instance Method Summary collapse

Instance Method Details

#from_hstore ⇒ Object

If the method from_hstore is called in a Hash, it just returns self.



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# File 'lib/activerecord_postgres_hstore_core/hash.rb', line 35

def from_hstore
  self
end

#hstore_escape(str) ⇒ Object

Escapes values such that they will work in an hstore string



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# File 'lib/activerecord_postgres_hstore_core/hash.rb', line 5

def hstore_escape(str)
  if str.nil?
    return 'NULL'
  end
  
  str = str.to_s.dup
  # backslash is an escape character for strings, and an escape character for gsub, so you need 6 backslashes to get 2 in the output.
  # see http://stackoverflow.com/questions/1542214/weird-backslash-substitution-in-ruby for the gory details
  str.gsub!(/\\/, '\\\\\\')
  # escape backslashes before injecting more backslashes
  str.gsub!(/"/, '\"')
  
  if str =~ HSTORE_ESCAPED or str.empty?
    str = '"%s"' % str
  end
  
  return str
end

#to_hstore ⇒ Object

Generates an hstore string format. This is the format used to insert or update stuff in the database.



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# File 'lib/activerecord_postgres_hstore_core/hash.rb', line 26

def to_hstore
  return "" if empty?

  map do |idx, val| 
    "%s=>%s" % [hstore_escape(idx), hstore_escape(val)]
  end * ","
end