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# File 'lib/rubocop/cop/graphql/overfetch.rb', line 14
def investigate(processed_source)
erb = File.read(processed_source.buffer.name)
query, = ::GraphQL::Client::ViewModule.(erb)
return unless query
aliases = {}
fields = {}
ranges = {}
document = ::GraphQL.parse(query.gsub(/::/, "__"))
visitor = ::GraphQL::Language::Visitor.new(document)
visitor[::GraphQL::Language::Nodes::Field] << ->(node, _parent) do
name = node.alias || node.name
fields[name] ||= 0
field_aliases(name).each { |n| (aliases[n] ||= []) << name }
ranges[name] ||= source_range(processed_source.buffer, node.line, 0)
end
visitor.visit
send_methods(processed_source.ast).each do |node|
_receiver, method_name, *_args = *node
aliases.fetch(method_name.to_s, []).each do |field_name|
fields[field_name] += 1
end
end
fields.each do |field, count|
next if count > 0
add_offense(nil, ranges[field], "GraphQL field '#{field}' query but was not used in template.")
end
end
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