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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 :project, :user
def initialize(project, user)
@project = project
@user = user
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(project, user)
merge_request_parser = Banzai::ReferenceParser::MergeRequestParser.new(project, user)
issue_parser.issues_for_nodes(nodes).merge(
merge_request_parser.merge_requests_for_nodes(nodes)
)
end
end
end
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