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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, default: ActiveSupport::Cache::MemoryStore.new
end
private
def cache_collection_render(instrumentation_payload)
return yield unless @options[:cached]
keyed_collection = collection_by_cache_keys
cached_partials = collection_cache.read_multi(*keyed_collection.keys)
instrumentation_payload[:cache_hits] = cached_partials.size
@collection = keyed_collection.reject { |key, _| cached_partials.key?(key) }.values
rendered_partials = @collection.empty? ? [] : yield
index = 0
fetch_or_cache_partial(cached_partials, order_by: keyed_collection.each_key) do
rendered_partials[index].tap { index += 1 }
end
end
def callable_cache_key?
@options[:cached].respond_to?(:call)
end
def collection_by_cache_keys
seed = callable_cache_key? ? @options[:cached] : ->(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.combined_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 fetch_or_cache_partial(cached_partials, order_by:)
order_by.map do |cache_key|
cached_partials.fetch(cache_key) do
yield.tap do |rendered_partial|
collection_cache.write(cache_key, rendered_partial)
end
end
end
end
end
end
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