Module: PGCrypto::ClassMethods

Defined in:
lib/pgcrypto.rb

Instance Method Summary collapse

Instance Method Details

#pgcrpyto_columns ⇒ Object 



80
81
82
 
# File 'lib/pgcrypto.rb', line 80

def pgcrpyto_columns
  PGCrypto[table_name]
end

#pgcrypto(*pgcrypto_column_names) ⇒ Object 



22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
 
# File 'lib/pgcrypto.rb', line 22

def pgcrypto(*pgcrypto_column_names)
  options = pgcrypto_column_names.last.is_a?(Hash) ? pgcrypto_column_names.pop : {}
  options = {:include => false, :type => :pgp}.merge(options)

  has_many :pgcrypto_columns, :as => :owner, :autosave => true, :class_name => 'PGCrypto::Column', :dependent => :delete_all

  hooks do
    before(:reload) do
      self.class.pgcrpyto_columns.each do |column_name, options|
        reset_attribute! column_name
        changed_attributes.delete(column_name)
      end
    end
  end

  pgcrypto_column_names.map(&:to_s).each do |column_name|
    # Stash the encryption type in our module so various monkeypatches can access it later!
    PGCrypto[table_name][column_name] = options.symbolize_keys

    # Add dynamic attribute readers/writers for ActiveModel APIs
    # define_attribute_method column_name

    # Add attribute readers/writers to keep this baby as fluid and clean as possible.
    start_line = __LINE__; pgcrypto_methods = <<-PGCRYPTO_METHODS
    def #{column_name}
      return @_pgcrypto_#{column_name}.try(:value) if defined?(@_pgcrypto_#{column_name})
      @_pgcrypto_#{column_name} ||= select_pgcrypto_column(:#{column_name})
      @_pgcrypto_#{column_name}.try(:value)
    end

    # We write the attribute directly to its child value. Neato!
    def #{column_name}=(value)
      attribute_will_change!(:#{column_name}) if value != @_pgcrypto_#{column_name}.try(:value)
      if value.nil?
        pgcrypto_columns.select{|column| column.name == "#{column_name}"}.each(&:mark_for_destruction)
        remove_instance_variable("@_pgcrypto_#{column_name}") if defined?(@_pgcrypto_#{column_name})
      else
        @_pgcrypto_#{column_name} ||= pgcrypto_columns.select{|column| column.name == "#{column_name}"}.first || pgcrypto_columns.new(:name => "#{column_name}")
        pgcrypto_columns.push(@_pgcrypto_#{column_name})
        @_pgcrypto_#{column_name}.value = value
      end
    end

    def #{column_name}_changed?
      changed.include?(:#{column_name})
    end
    PGCRYPTO_METHODS

    class_eval pgcrypto_methods, __FILE__, start_line
  end

  # If any columns are set to be included in the parent record's finder,
  # we'll go ahead and add 'em!
  if PGCrypto[table_name].any?{|column, options| options[:include] }
    default_scope includes(:pgcrypto_columns)
  end
end