64 lines
2.6 KiB
Ruby
64 lines
2.6 KiB
Ruby
# frozen_string_literal: true
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module ActionController
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# Handles implicit rendering for a controller action that does not
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# explicitly respond with +render+, +respond_to+, +redirect+, or +head+.
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#
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# For API controllers, the implicit response is always <tt>204 No Content</tt>.
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#
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# For all other controllers, we use these heuristics to decide whether to
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# render a template, raise an error for a missing template, or respond with
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# <tt>204 No Content</tt>:
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#
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# First, if we DO find a template, it's rendered. Template lookup accounts
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# for the action name, locales, format, variant, template handlers, and more
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# (see +render+ for details).
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#
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# Second, if we DON'T find a template but the controller action does have
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# templates for other formats, variants, etc., then we trust that you meant
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# to provide a template for this response, too, and we raise
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# <tt>ActionController::UnknownFormat</tt> with an explanation.
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#
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# Third, if we DON'T find a template AND the request is a page load in a web
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# browser (technically, a non-XHR GET request for an HTML response) where
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# you reasonably expect to have rendered a template, then we raise
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# <tt>ActionView::UnknownFormat</tt> with an explanation.
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#
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# Finally, if we DON'T find a template AND the request isn't a browser page
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# load, then we implicitly respond with <tt>204 No Content</tt>.
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module ImplicitRender
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# :stopdoc:
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include BasicImplicitRender
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def default_render
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if template_exists?(action_name.to_s, _prefixes, variants: request.variant)
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render
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elsif any_templates?(action_name.to_s, _prefixes)
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message = "#{self.class.name}\##{action_name} is missing a template " \
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"for this request format and variant.\n" \
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"\nrequest.formats: #{request.formats.map(&:to_s).inspect}" \
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"\nrequest.variant: #{request.variant.inspect}"
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raise ActionController::UnknownFormat, message
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elsif interactive_browser_request?
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message = "#{self.class.name}\##{action_name} is missing a template for request formats: #{request.formats.map(&:to_s).join(',')}"
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raise ActionController::MissingExactTemplate, message
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else
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logger.info "No template found for #{self.class.name}\##{action_name}, rendering head :no_content" if logger
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super
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end
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end
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def method_for_action(action_name)
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super || if template_exists?(action_name.to_s, _prefixes)
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"default_render"
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end
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end
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private
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def interactive_browser_request?
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request.get? && request.format == Mime[:html] && !request.xhr?
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end
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end
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end
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