65 lines
1.9 KiB
Ruby
65 lines
1.9 KiB
Ruby
# references:
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# https://evilmartians.com/chronicles/active-storage-meets-graphql-pt-2-exposing-attachment-urls
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module Extensions
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class Attachment < GraphQL::Schema::FieldExtension
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attr_reader :attachment_assoc, :root
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def apply
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# Here we try to define the ActiveRecord association name:
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# - it could be set explicitly via extension options
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# - or we imply that is the same as the field name w/o "_url"
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# suffix (e.g., "avatar_url" => "avatar")
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@attachment_assoc = if options.key?(:attachment)
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"#{options[:attachment]}_attachment"
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elsif options.key?(:attachments)
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"#{options[:attachments]}_attachments"
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else
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attachment = field.original_name.to_s.sub(/_url$/, "")
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"#{attachment}_attachment"
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end
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@root = options&.dig(:root) || :object
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end
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# This method resolves (as it states) the field itself
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# (it's the same as defining a method within a type)
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def resolve(object:, **_rest)
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root_instance = object.public_send(root)
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Loaders::Association.for(
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root_instance.class,
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attachment_assoc => :blob
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).load(root_instance)
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end
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# This method is called if the result of the `resolve`
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# is a lazy value (e.g., a Promise – like in our case)
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def after_resolve(value:, **_rest)
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if value.respond_to?(:map)
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attachments = value.map { after_resolve_attachment(_1) }
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if options[:as] == :single
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attachments.first
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else
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attachments
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end
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else
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attachment = after_resolve_attachment(value)
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if options[:as] == :multiple
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[attachment].compact
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else
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attachment
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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 after_resolve_attachment(attachment)
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return unless attachment
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if attachment.virus_scanner.safe? || attachment.virus_scanner.pending?
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attachment
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end
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end
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end
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end
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