Module: Endeca::Readers::ClassMethods

Defined in:
lib/endeca/readers.rb

Instance Method Summary collapse

Instance Method Details

#add_reader(name, &block) ⇒ Object 



6
7
8
9
10
11
 
# File 'lib/endeca/readers.rb', line 6

def add_reader(name, &block)
  meta = (class << self; self; end)
  meta.instance_eval do
    define_method(name) { |*attrs| reader(*attrs, &block) }
  end
end

#boolean_reader(*attrs) ⇒ Object

Typecasts attributes as a Perly boolean (“0” == false, “1” == true“)

Examples

boolean_reader :price



84
85
86
 
# File 'lib/endeca/readers.rb', line 84

def boolean_reader(*attrs)
  reader(*attrs) { |value| value == "1" ? true : false }
end

#decimal_reader(*attrs) ⇒ Object

Typecasts attributes as BigDecimal

Examples

decimal_reader :price



59
60
61
62
 
# File 'lib/endeca/readers.rb', line 59

def decimal_reader(*attrs)
  require 'bigdecimal' unless defined?(BigDecimal)
  reader(*attrs) { |value| BigDecimal(value.to_s) }
end

#float_reader(*attrs) ⇒ Object

Typecasts attributes as floats

Examples

float_reader :latitude, :longitude



68
69
70
71
72
73
74
75
76
77
78
 
# File 'lib/endeca/readers.rb', line 68

def float_reader(*attrs)
  reader(*attrs) do |value| 
    if value 
      if value.respond_to?(:to_f)
        value.to_f
      else 
        Float(value) 
      end
    end
  end
end

#integer_reader(*attrs) ⇒ Object

Typecasts attributes as integers.

Examples

integer_reader :id, :rating



51
52
53
 
# File 'lib/endeca/readers.rb', line 51

def integer_reader(*attrs)
  reader(*attrs) { |value| value.blank? ? 0 : Integer(value) }
end

#reader(*attrs, &block) ⇒ Object

Maps key/value pairs from the data structure used to initialize a Endeca object. Allows attribute renaming. Use a block to perform data injunction on the value as it is set.

Examples

# Specify basic attributes
reader :title

# Attribute renaming
reader :long_desc => :description

# Data injunction
reader(:title => :upcased_title) { |title| title.upcase }



27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
 
# File 'lib/endeca/readers.rb', line 27

def reader(*attrs,&block)
  hash = {}
  block ||= lambda {|x| x}

  hash.update(attrs.pop) if Hash === attrs.last

  attrs.each{ |attr| hash[attr] = attr }

  hash.each do |variable, method|
    reader_names << method if respond_to?(:reader_names)
    define_method(method) do
      begin
        block.call(attributes[variable.to_s])
      rescue StandardError => e
        raise Endeca::ReaderError, e.message
      end
    end
  end
end