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require 'active_support/core_ext/object/try'
module ActionView
module CollectionCaching # :nodoc:
extend ActiveSupport::Concern
included do
# Fallback cache store if Action View is used without Rails.
# Otherwise overridden in Railtie to use Rails.cache.
mattr_accessor(:collection_cache) { ActiveSupport::Cache::MemoryStore.new }
end
private
def cache_collection_render
return yield unless cache_collection?
keyed_collection = collection_by_cache_keys
cached_partials = collection_cache.read_multi(*keyed_collection.keys)
@collection = keyed_collection.reject { |key, _| cached_partials.key?(key) }.values
rendered_partials = @collection.empty? ? [] : yield
index = 0
keyed_collection.map do |cache_key, _|
cached_partials.fetch(cache_key) do
rendered_partials[index].tap { index += 1 }
end
end
end
def cache_collection?
@options.fetch(:cache, automatic_cache_eligible?)
end
def automatic_cache_eligible?
@template && @template.eligible_for_collection_caching?(as: @options[:as])
end
def callable_cache_key?
@options[:cache].respond_to?(:call)
end
def collection_by_cache_keys
seed = callable_cache_key? ? @options[:cache] : ->(i) { i }
@collection.each_with_object({}) do |item, hash|
hash[expanded_cache_key(seed.call(item))] = item
end
end
def expanded_cache_key(key)
key = @view.fragment_cache_key(@view.cache_fragment_name(key, virtual_path: @template.virtual_path))
key.frozen? ? key.dup : key # #read_multi & #write may require mutability, Dalli 2.6.0.
end
def collection_cache_rendered_partial(rendered_partial, key_by)
if callable_cache_key?
key = expanded_cache_key(@options[:cache].call(key_by))
collection_cache.write(key, rendered_partial, @options[:cache_options])
end
end
end
end
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