58 lines
1.9 KiB
Ruby
58 lines
1.9 KiB
Ruby
# frozen_string_literal: true
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module ActionController
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# When our views change, they should bubble up into HTTP cache freshness
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# and bust browser caches. So the template digest for the current action
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# is automatically included in the ETag.
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#
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# Enabled by default for apps that use Action View. Disable by setting
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#
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# config.action_controller.etag_with_template_digest = false
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#
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# Override the template to digest by passing +:template+ to +fresh_when+
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# and +stale?+ calls. For example:
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#
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# # We're going to render widgets/show, not posts/show
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# fresh_when @post, template: 'widgets/show'
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#
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# # We're not going to render a template, so omit it from the ETag.
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# fresh_when @post, template: false
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#
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module EtagWithTemplateDigest
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extend ActiveSupport::Concern
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include ActionController::ConditionalGet
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included do
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class_attribute :etag_with_template_digest, default: true
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ActiveSupport.on_load :action_view, yield: true do
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etag do |options|
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determine_template_etag(options) if etag_with_template_digest
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end
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end
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end
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private
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def determine_template_etag(options)
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if template = pick_template_for_etag(options)
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lookup_and_digest_template(template)
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end
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end
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# Pick the template digest to include in the ETag. If the +:template+ option
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# is present, use the named template. If +:template+ is +nil+ or absent, use
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# the default controller/action template. If +:template+ is false, omit the
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# template digest from the ETag.
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def pick_template_for_etag(options)
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unless options[:template] == false
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options[:template] || "#{controller_path}/#{action_name}"
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end
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end
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def lookup_and_digest_template(template)
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ActionView::Digestor.digest name: template, format: nil, finder: lookup_context
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end
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end
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end
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