Add ArraySerializer#object like Serializer

[bf4]

Useful for adapters that need access to the collection the ArraySerializer
is serializing. e.g.

active_model_serializers/lib/active_model/serializer/adapter/json_api.rb

Lines 166 to 167 in 87c47f8

	resources = serializer.instance_variable_get(:@resource)
	@hash[:links] = add_pagination_links(links, resources, options) if is_paginated?(resources)

  resources = serializer.instance_variable_get(:@resource)
  @hash[:links] = add_pagination_links(links, resources, options) if is_paginated?(resources)
end

def add_pagination_links(links, resources, options)
  pagination_links = JsonApi::PaginationLinks.new(resources, options[:context]).serializable_hash(options)

would become

  @hash[:links] = add_pagination_links(links, options)
end

def add_pagination_links(links, options)
  resources = serializer.object
  return links unless is_paginated?(resources)
  pagination_links = JsonApi::PaginationLinks.new(resources, options[:context]).serializable_hash(options)

[bacarini]

👍

[bf4]

@joaomdmoura don't forget about me :( :)

[joaomdmoura]

👍

[joaomdmoura]

@joaomdmoura don't forget about me :( :)

How could I? Never! Merging this, nice!