Method: GraphQL::Dataloader#run_isolated

Defined in:
lib/graphql/dataloader.rb

#run_isolated ⇒ Object

Use a self-contained queue for the work in the block.



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# File 'lib/graphql/dataloader.rb', line 161

def run_isolated
  prev_queue = @pending_jobs
  prev_pending_keys = {}
  prev_lazies_at_depth = @lazies_at_depth
  @lazies_at_depth = @lazies_at_depth.dup.clear
  # Clear pending loads but keep already-cached records
  # in case they are useful to the given block.
  @source_cache.each do |source_class, batched_sources|
    batched_sources.each do |batch_args, batched_source_instance|
      if batched_source_instance.pending?
        prev_pending_keys[batched_source_instance] = batched_source_instance.pending.dup
        batched_source_instance.pending.clear
      end
    end
  end

  @pending_jobs = []
  res = nil
  # Make sure the block is inside a Fiber, so it can `Fiber.yield`
  append_job {
    res = yield
  }
  run
  res
ensure
  @pending_jobs = prev_queue
  @lazies_at_depth = prev_lazies_at_depth
  prev_pending_keys.each do |source_instance, pending|
    pending.each do |key, value|
      if !source_instance.results.key?(key)
        source_instance.pending[key] = value
      end
    end
  end
end