method

fetch_or_cache_partial

v7.1.3.4 - Show latest stable - 0 notes - Class: CollectionCaching

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What's this?

fetch_or_cache_partial(cached_partials, template, order_by:) private

`order_by` is an enumerable object containing keys of the cache, all keys are passed in whether found already or not.

`cached_partials` is a hash. If the value exists it represents the rendered partial from the cache otherwise `Hash#fetch` will take the value of its block.

This method expects a block that will return the rendered partial. An example is to render all results for each element that was not found in the cache and store it as an array. Order it so that the first empty cache element in `cached_partials` corresponds to the first element in `rendered_partials`.

If the partial is not already cached it will also be written back to the underlying cache store.

Show source

# File actionview/lib/action_view/renderer/partial_renderer/collection_caching.rb, line 91
      def fetch_or_cache_partial(cached_partials, template, order_by))
        entries_to_write = {}

        keyed_partials = order_by.index_with do |cache_key|
          if content = cached_partials[cache_key]
            build_rendered_template(content, template)
          else
            rendered_partial = yield
            body = rendered_partial.body

            # We want to cache buffers as raw strings. This both improve performance and
            # avoid creating forward compatibility issues with the internal representation
            # of these two types.
            if body.is_a?(ActionView::OutputBuffer) || body.is_a?(ActiveSupport::SafeBuffer)
              body = body.to_str
            end

            entries_to_write[cache_key] = body
            rendered_partial
          end
        end

        unless entries_to_write.empty?
          collection_cache.write_multi(entries_to_write)
        end

        keyed_partials
      end

fetch_or_cache_partial

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