Module: GraphQL::Execution::Interpreter::Resolve

Defined in:
lib/graphql/execution/interpreter/resolve.rb

Class Method Summary collapse

Class Method Details

.resolve(results, dataloader) ⇒ void

This method returns an undefined value.

After getting results back from an interpreter evaluation, continue it until you get a response-ready Ruby value.

results is one level of depth of a query or multiplex.

Resolve all lazy values in that depth before moving on to the next level.

It’s assumed that the lazies will return Lazy instances if there’s more work to be done, or return Hash/Array if the query should be continued.



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# File 'lib/graphql/execution/interpreter/resolve.rb', line 50

def self.resolve(results, dataloader)
  # There might be pending jobs here that _will_ write lazies
  # into the result hash. We should run them out, so we
  # can be sure that all lazies will be present in the result hashes.
  # A better implementation would somehow interleave (or unify)
  # these approaches.
  dataloader.run
  next_results = []
  while !results.empty?
    result_value = results.shift
    if result_value.is_a?(Runtime::GraphQLResultHash) || result_value.is_a?(Hash)
      results.concat(result_value.values)
      next
    elsif result_value.is_a?(Runtime::GraphQLResultArray)
      results.concat(result_value.values)
      next
    elsif result_value.is_a?(Array)
      results.concat(result_value)
      next
    elsif result_value.is_a?(Lazy)
      loaded_value = result_value.value
      if loaded_value.is_a?(Lazy)
        # Since this field returned another lazy,
        # add it to the same queue
        results << loaded_value
      elsif loaded_value.is_a?(Runtime::GraphQLResultHash) || loaded_value.is_a?(Runtime::GraphQLResultArray) ||
          loaded_value.is_a?(Hash) || loaded_value.is_a?(Array)
        # Add these values in wholesale --
        # they might be modified by later work in the dataloader.
        next_results << loaded_value
      end
    end
  end

  if !next_results.empty?
    # Any pending data loader jobs may populate the
    # resutl arrays or result hashes accumulated in
    # `next_results``. Run those **to completion**
    # before continuing to resolve `next_results`.
    # (Just `.append_job` doesn't work if any pending
    # jobs require multiple passes.)
    dataloader.run
    dataloader.append_job { resolve(next_results, dataloader) }
  end

  nil
end

.resolve_all(results, dataloader) ⇒ void

This method returns an undefined value.

Continue field results in results until there’s nothing else to continue.



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# File 'lib/graphql/execution/interpreter/resolve.rb', line 9

def self.resolve_all(results, dataloader)
  dataloader.append_job { resolve(results, dataloader) }
  nil
end

.resolve_each_depth(lazies_at_depth, dataloader) ⇒ Object 



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# File 'lib/graphql/execution/interpreter/resolve.rb', line 14

def self.resolve_each_depth(lazies_at_depth, dataloader)
  smallest_depth = nil
  lazies_at_depth.each_key do |depth_key|
    smallest_depth ||= depth_key
    if depth_key < smallest_depth
      smallest_depth = depth_key
    end
  end

  if smallest_depth
    lazies = lazies_at_depth.delete(smallest_depth)
    if !lazies.empty?
      dataloader.append_job {
        lazies.each(&:value) # resolve these Lazy instances
      }
      # Run lazies _and_ dataloader, see if more are enqueued
      dataloader.run
      resolve_each_depth(lazies_at_depth, dataloader)
    end
  end
  nil
end