Module: Deferring

Defined in:
lib/deferring.rb,
lib/deferring/version.rb,
lib/deferring/deferred_association.rb,
lib/deferring/deferred_callback_listener.rb

Defined Under Namespace

Classes: DeferredAssociation, DeferredCallbackListener

Constant Summary collapse

VERSION = 
'0.8.2'

Instance Method Summary collapse

Instance Method Details

#deferred_accepts_nested_attributes_for(*args) ⇒ Object 



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# File 'lib/deferring.rb', line 48

def deferred_accepts_nested_attributes_for(*args)
  options = args.extract_options!
  reject_if = options.delete(:reject_if)
  accepts_nested_attributes_for(*args, options)

  association_name = args.first.to_s

  # teams_attributes=
  define_method :"#{association_name}_attributes=" do |attributes_collection|
    unless attributes_collection.is_a?(Hash) || attributes_collection.is_a?(Array)
      raise ArgumentError, "Hash or Array expected, got #{attributes_collection.class.name} (#{attributes_collection.inspect})"
    end

    # TODO: Implement :limit checks. Check rails source.

    if attributes_collection.is_a? Hash
      keys = attributes_collection.keys
      attributes_collection = if keys.include?('id') || keys.include?(:id)
        [attributes_collection]
      else
        attributes_collection.values
      end
    end

    attributes_collection.each do |attributes|
      attributes = attributes.with_indifferent_access

      if attributes['id'].blank?
        if !send(:"deferred_#{association_name}_reject_new_record?", attributes)
          send(:"#{association_name}").build(attributes.except(*deferred_unassignable_keys))
        end

      elsif existing_record = send(:"#{association_name}").detect { |record| record.id.to_s == attributes['id'].to_s }
        if !send(:"deferred_#{association_name}_call_reject_if", attributes)

          existing_record.attributes = attributes.except(*deferred_unassignable_keys)

          # TODO: Implement value_to_boolean code from rails for checking _destroy field.
          if attributes['_destroy'] == '1' && options[:allow_destroy]
            # remove from existing records and mark for destruction upon
            # saving
            send(:"#{association_name}").delete(existing_record)
            existing_record.mark_for_destruction
          end
        end

      else # new record referenced by id
        if !send(:"deferred_#{association_name}_call_reject_if", attributes)
          klass = self.class.reflect_on_association(:"#{association_name}").klass

          attribute_ids = attributes_collection.map { |a| a['id'] || a[:id] }.compact
          # TODO: Find out how to get send(:"#{association_name}").scoped.where working
          new_records = attribute_ids.empty? ? [] : klass.where(klass.primary_key => attribute_ids)
          new_record = new_records.detect { |record| record.id.to_s == attributes['id'].to_s }

          send(:"#{association_name}").push(new_record)
        end
      end
    end
  end

  # Determines if a new record should be build by checking for
  # has_destroy_flag? or if a <tt>:reject_if</tt> proc exists for this
  # association and evaluates to +true+.
  define_method :"deferred_#{association_name}_reject_new_record?" do |attributes|
    # TODO: Implement value_to_boolean code from rails for checking _destroy field.
    attributes['_destroy'] == '1' || send(:"deferred_#{association_name}_call_reject_if", attributes)
  end

  define_method :"deferred_#{association_name}_call_reject_if" do |attributes|
    return false if attributes['_destroy'] == '1'
    case callback = reject_if
    when Symbol
      method(callback).arity == 0 ? send(callback) : send(callback, attributes)
    when Proc
      callback.call(attributes)
    end
  end

  define_method :deferred_unassignable_keys do
    %w(_destroy id)
  end
end

#deferred_has_and_belongs_to_many(*args) ⇒ Object

Creates a wrapper around ‘has_and_belongs_to_many`. A normal habtm association is created, but this association is wrapped in a DeferredAssociation. The accessor methods of the original association are replaced with ones that will defer saving the association until the parent object has been saved.



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# File 'lib/deferring.rb', line 11

def deferred_has_and_belongs_to_many(*args)
  options = args.extract_options!
  listeners = create_callback_listeners!(options)
  autosave = options.fetch(:autosave, true)
  validate = options.fetch(:validate, true)

  has_and_belongs_to_many(*args, **options)
  generate_deferred_association_methods(
    args.first.to_s,
    listeners,
    autosave: autosave,
    type: :habtm,
    validate: validate)
end

#deferred_has_many(*args) ⇒ Object

Creates a wrapper around ‘has_many`. A normal has many association is created, but this association is wrapped in a DeferredAssociation. The accessor methods of the original association are replaced with ones that will defer saving the association until the parent object has been saved.



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# File 'lib/deferring.rb', line 30

def deferred_has_many(*args)
  options = args.extract_options!
  listeners = create_callback_listeners!(options)
  inverse_association_name = options[:as] || options[:inverse_of] || self.name.underscore.to_sym
  autosave = options.fetch(:autosave, true)
  validate = options.fetch(:validate, true)

  has_many(*args, **options)
  generate_deferred_association_methods(
    args.first.to_s,
    listeners,
    inverse_association_name: inverse_association_name,
    autosave: autosave,
    type: :has_many,
    dependent: options[:dependent],
    validate: validate)
end