Module: ActiveNull

Defined in:
lib/active_null.rb,
lib/active_null/version.rb,
lib/active_null/null_model_builder.rb

Defined Under Namespace

Classes: NullModelBuilder

Constant Summary collapse

VERSION = 
'1.1.0'

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.extended(klass) ⇒ Object 



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# File 'lib/active_null.rb', line 61

def self.extended(klass)
  klass.class_eval "    after_initialize do\n      self.class.null_associations\n    end\n  CODE\nend\n"

Instance Method Details

#find_by(*args, &block) ⇒ Object 



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# File 'lib/active_null.rb', line 29

def find_by(*args, &block)
  super || null
end

#null ⇒ Object 



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# File 'lib/active_null.rb', line 5

def null
  null_class.get
end

#null_associations ⇒ Object 



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# File 'lib/active_null.rb', line 33

def null_associations
  self.reflect_on_all_associations.each do |relation|
    unless relation.collection?
      klass = begin
        if relation.options[:polymorphic]
          polymorphic_null_defaults[relation.name]
        elsif relation.klass
          relation.klass.name
        end
      rescue
        nil
      end
      next unless klass
      class_eval "        def \#{relation.name}(*args)\n          result = association(:\#{relation.name}).reader(*args)\n          return result if result || !\#{klass}.respond_to?(:null)\n          \#{klass}.null\n        end\n      CODE\n    end\n  end\nend\n"

#null_class ⇒ Object 



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# File 'lib/active_null.rb', line 57

def null_class
  @null_class ||= NullModelBuilder.new(self, @null_model_overrides).build
end

#null_defaults_for_polymorphic(mappings) ⇒ Object 



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# File 'lib/active_null.rb', line 9

def null_defaults_for_polymorphic mappings
  @polymorphic_null_defaults = mappings
end

#null_model(method_name = nil, &block) ⇒ Object 



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# File 'lib/active_null.rb', line 17

def null_model(method_name=nil, &block)
  @null_model_overrides = if block_given?
    Module.new.tap { |m| m.module_eval(&block) }
  end

  if method_name
    singleton_class.class_eval do
      define_method(method_name) { null }
    end
  end
end

#polymorphic_null_defaults ⇒ Object 



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# File 'lib/active_null.rb', line 13

def polymorphic_null_defaults
  @polymorphic_null_defaults || {}
end