vendor/rails/activerecord/lib/active_record/dynamic_finder_match.rb

   1 module ActiveRecord
   2   class DynamicFinderMatch
   3     def self.match(method)
   4       df_match = self.new(method)
   5       df_match.finder ? df_match : nil
   6     end
   7
   8     def initialize(method)
   9       @finder = :first
  10       case method.to_s
  11       when /^find_(all_by|last_by|by)_([_a-zA-Z]\w*)$/
  12         @finder = :last if $1 == 'last_by'
  13         @finder = :all if $1 == 'all_by'
  14         names = $2
  15       when /^find_by_([_a-zA-Z]\w*)\!$/
  16         @bang = true
  17         names = $1
  18       when /^find_or_(initialize|create)_by_([_a-zA-Z]\w*)$/
  19         @instantiator = $1 == 'initialize' ? :new : :create
  20         names = $2
  21       else
  22         @finder = nil
  23       end
  24       @attribute_names = names && names.split('_and_')
  25     end
  26
  27     attr_reader :finder, :attribute_names, :instantiator
  28
  29     def finder?
  30       !@finder.nil? && @instantiator.nil?
  31     end
  32
  33     def instantiator?
  34       @finder == :first && !@instantiator.nil?
  35     end
  36
  37     def bang?
  38       @bang
  39     end
  40   end
  41 end