Created
March 8, 2011 06:42
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ripped from the factories-and-workers gem
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| require 'digest/sha1' | |
| module FactoriesAndWorkers | |
| module Factory | |
| def self.included( base ) | |
| def factory( kind, default_attrs, opts={}, &block ) | |
| FactoryBuilder.new( kind, default_attrs, opts, self, &block ) | |
| end | |
| # creates a random hex string, converts it to hexatridecimal, and truncates to desired length (max 30) | |
| def uniq len=10 | |
| raise ArgumentError, "Factory::uniq - length must be <= 30" if len > 30 | |
| Digest::SHA1.hexdigest("#{rand(1<<64)}/#{Time.now.to_f}/#{Process.pid}").to_i(16).to_s(36)[1..len] | |
| end | |
| @@factory_counter = Hash.new(0) | |
| def increment! counter | |
| @@factory_counter[ counter.to_s ] += 1 | |
| end | |
| @@factory_initializers = {} | |
| def factory_initializers | |
| @@factory_initializers | |
| end | |
| end | |
| end | |
| class FactoryBuilder | |
| def initialize( factory, default_attrs, opts, from_klass, &block ) | |
| raise ArgumentError, ":chain must be a lambda block!" if opts[:chain] && !opts[:chain].is_a?( Proc ) | |
| opts.reverse_merge!( :class => factory ) | |
| ar_klass = opts[:class].to_s.camelize.constantize | |
| from_klass.factory_initializers[ factory ] = block if block_given? | |
| # make the valid attributes method | |
| valid_attrs_method = :"valid_#{factory}_attributes" | |
| Factory.send :define_method, valid_attrs_method do |*args| | |
| action = args.first.is_a?( TrueClass ) ? :create : :build | |
| attrs = default_attrs.symbolize_keys | |
| attr_overrides = args.extract_options! | |
| attrs.merge!( attr_overrides.symbolize_keys ) if attr_overrides | |
| attrs.reverse_merge!( opts[:chain].call ) if opts[:chain] | |
| attrs.each_pair do |key, value| | |
| if attr_overrides.keys.include?(:"#{key}_id") | |
| attrs.delete(key) # if :#{model}_id is overridden, then remove :#{model} and don't evaluate the lambda block | |
| else | |
| attrs[key] = case value | |
| when Proc | |
| value.call # evaluate lambda blocks | |
| when :belongs_to_model | |
| send( :"#{action}_#{key}" ) # create or build model dependencies, if none are found in the db | |
| when Hash | |
| if kind = value[:belongs_to_model] | |
| send( :"#{action}_#{kind}") | |
| end | |
| when String # interpolate magic variables | |
| value.gsub( /\$UNIQ\((\d+)\)/ ){ from_klass.uniq( $1.to_i ) }. | |
| gsub( '$COUNT', from_klass.increment!( :"#{ar_klass}_#{key}" ).to_s ) | |
| else | |
| value | |
| end | |
| end | |
| end | |
| end | |
| # make the valid attribute method, which only fetches a single attribute | |
| valid_attr_method = :"valid_#{factory}_attribute" | |
| Factory.send :define_method, valid_attr_method do |arg| | |
| return unless arg.is_a?( Symbol ) | |
| base = default_attrs.dup | |
| base.reverse_merge!( opts[:chain].call ) if opts[:chain] | |
| returning base[ arg ] do |value| | |
| value = value.call if value.is_a?( Proc ) # evaluate lambda if needed | |
| end | |
| end | |
| # alias default_*_attributes to valid_*_attributes, for semantic equivalency | |
| Factory.send :alias_method, valid_attrs_method.to_s.gsub('valid','default').to_sym, valid_attrs_method | |
| Factory.send :alias_method, valid_attr_method.to_s.gsub('valid','default').to_sym, valid_attr_method | |
| after_initialize_block = from_klass.factory_initializers[ factory ] | |
| # make the create method | |
| Factory.send :define_method, :"create_#{factory}" do |*args| | |
| ar_klass.create!( self.send( valid_attrs_method, true, args.first ) ) do |obj| | |
| after_initialize_block.call( obj ) if after_initialize_block | |
| end | |
| end | |
| # make the build method | |
| Factory.send :define_method, :"build_#{factory}" do |*args| | |
| ar_klass.new( self.send( valid_attrs_method, false, args.first ) ) do |obj| | |
| after_initialize_block.call( obj ) if after_initialize_block | |
| end | |
| end | |
| end #initialize | |
| end | |
| end |
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