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

VERSION =

'0.0.5'

Class Method Summary

• .extended(klass) ⇒ Object

Instance Method Summary

• #find_by(*args, &block) ⇒ Object
• #null ⇒ Object
• #null_associations ⇒ Object
• #null_model(&block) ⇒ Object

Class Method Details

.extended(klass) ⇒ Object

# File 'lib/active_null.rb', line 34

def self.extended(klass)
  klass.class_eval <<-CODE
    after_initialize do
      self.class.null_associations
    end
  CODE
end

Instance Method Details

#find_by(*args, &block) ⇒ Object

# File 'lib/active_null.rb', line 16

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

#null ⇒ Object

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

def null
  @null_class.get
end

#null_associations ⇒ Object

# File 'lib/active_null.rb', line 20

def null_associations
  self.reflect_on_all_associations.each do |relation|
    unless relation.collection?
      class_eval <<-CODE
        def #{relation.name}(*args)
          result = association(:#{relation.name}).reader(*args)
          return result if result || !#{relation.klass.name}.respond_to?(:null)
          #{relation.klass.name}.null
        end
      CODE
    end
  end
end

#null_model(&block) ⇒ Object

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

def null_model(&block)
  null_model_overrides = if block_given?
    Module.new.tap { |m| m.module_eval(&block) }
  end
  @null_class = NullModelBuilder.new(self, null_model_overrides).build
end