Module: LookupBy::Lookup::MacroMethods

Defined in:
lib/lookup_by/lookup.rb

Instance Method Summary collapse

Instance Method Details

#is_a_lookup? ⇒ Boolean

Returns:

  • (Boolean) 


4
5
6
 
# File 'lib/lookup_by/lookup.rb', line 4

def is_a_lookup?
  is_a? Lookup::ClassMethods
end

#lookup_by(field, options = {}) ⇒ Object 



20
21
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
 
# File 'lib/lookup_by/lookup.rb', line 20

def lookup_by(field, options = {})
  begin
    connection
  rescue => error
    Rails.logger.error "lookup_by caught #{error.class.name} when connecting - skipping initialization (#{error.inspect})"
    return
  end

  options.symbolize_keys!
  options.assert_valid_keys :allow_blank, :order, :cache, :normalize, :find, :find_or_create, :raise

  raise "#{self} already called lookup_by" if is_a? Lookup::ClassMethods
  raise "#{self} responds_to :[], needed for lookup_by"     if respond_to? :[]
  raise "#{self} responds_to :lookup, needed for lookup_by" if respond_to? :lookup

  extend ClassMethods

  class_eval do
    include InstanceMethods

    singleton_class.class_eval do
      attr_reader :lookup
    end

    lookup_by_disable :destroy, :destroy_all, :delete, :delete_all

    # TODO: check for a db unique constraint or Rails validation

    unless field == :name || column_names.include?("name")
      alias_attribute :name, field

      attr_accessible :name if respond_to?(:accessible_attributes) && accessible_attributes.include?(field)
    end

    @lookup = Cache.new(self, options.merge(field: field))
    @lookup.reload
  end
end

#lookup_by_disable(*methods) ⇒ Object 



8
9
10
11
12
13
14
15
16
17
18
 
# File 'lib/lookup_by/lookup.rb', line 8

def lookup_by_disable(*methods)
  methods.each do |method|
    instance_eval <<-"END", __FILE__, __LINE__ + 1
      def self.#{method}(*args)
        raise NotImplementedError, "#{name}.#{method} is not supported on cached lookup tables." if @lookup.has_cache?

        super
      end
    END
  end
end