gitlab-org--gitlab-foss/lib/banzai/issuable_extractor.rb

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module Banzai
# Extract references to issuables from multiple documents
# This populates RequestStore cache used in Banzai::ReferenceParser::IssueParser
# and Banzai::ReferenceParser::MergeRequestParser
# Populating the cache should happen before processing documents one-by-one
# so we can avoid N+1 queries problem
class IssuableExtractor
QUERY = %q(
descendant-or-self::a[contains(concat(" ", @class, " "), " gfm ")]
[@data-reference-type="issue" or @data-reference-type="merge_request"]
).freeze
attr_reader :context
# context - An instance of Banzai::RenderContext.
def initialize(context)
@context = context
end
# Returns Hash in the form { node => issuable_instance }
def extract(documents)
nodes = documents.flat_map do |document|
document.xpath(QUERY)
end
issue_parser = Banzai::ReferenceParser::IssueParser.new(context)
merge_request_parser =
Banzai::ReferenceParser::MergeRequestParser.new(context)
issuables_for_nodes = issue_parser.records_for_nodes(nodes).merge(
merge_request_parser.records_for_nodes(nodes)
)
# The project for the issue/MR might be pending for deletion!
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# Filter them out because we don't care about them.
issuables_for_nodes.select { |node, issuable| issuable.project }
end
end
end