Class: GraphQL::Language::SelectionSet

Inherits:
Struct
  • Object
show all
Defined in:
lib/graphql/language/selection_set.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#selections ⇒ Object

Returns the value of attribute selections

Returns:

  • (Object) —

    the current value of selections



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# File 'lib/graphql/language/selection_set.rb', line 3

def selections
  @selections
end

Instance Method Details

#collect_fields(context, object_type, visited_fragments = []) ⇒ Object

GraphQL Specification

6.3 Evaluate selection sets
  CollectFields implementation
    objectType, selectionSet = self, visitedFragments = []
      + context[schema, document]



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# File 'lib/graphql/language/selection_set.rb', line 84

def collect_fields(context, object_type, visited_fragments = [])
  memo = {}

  selections.each do |selection|

    case selection

    when Field
      # TODO: Directives
      (memo[selection.key] ||= []) << selection

    when FragmentSpread
      next if visited_fragments.include?(selection.name)

      visited_fragments << selection.name

      fragment = context[:document].fragment(selection.name)

      next if fragment.nil?

      next unless fragment.apply?(context, object_type)

      fragment.selection_set.collect_fields(context, object_type).each do |key, fields|
        memo[key] = (memo[key] ||= []).concat(fields)
      end

    when InlineFragment
      next unless selection.apply?(context, object_type)

      selection.selection_set.collect_fields(context, object_type).each do |key, fields|
        memo[key] = (memo[key] ||= []).concat(fields)
      end

    end

  end

  memo
end

#complete_value(context, field_type, resolved_object, selection_set) ⇒ Object 



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# File 'lib/graphql/language/selection_set.rb', line 139

def complete_value(context, field_type, resolved_object, selection_set)
  return nil if resolved_object.nil?

  if resolved_object.is_a?(Exception)
    context[:errors] << "Field '#{field_type}' of '#{context[:field_name]}' error: '#{resolved_object}'."
    return nil
  end

  case field_type
  when GraphQLNonNull
    completed_object = complete_value(context, field_type.of_type, resolved_object, selection_set)
    raise "Field error: expecting non null value" if completed_object.nil?
    completed_object
  when GraphQLList
    resolved_object.map do |item|
      complete_value(context, field_type.of_type, item, selection_set)
    end
  when GraphQLScalarType, GraphQLEnumType
    field_type.serialize(resolved_object)
  when GraphQLObjectType, GraphQLInterfaceType, GraphQLUnionType
    field_type = field_type.resolve_type(resolved_object) if field_type.is_a?(GraphQLAbstractType)
    selection_set.evaluate(context, field_type, resolved_object)
  end

end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/graphql/language/selection_set.rb', line 5

def empty?
  selections.empty?
end

#evaluate(context, object_type, object, serially: false) ⇒ Object 



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# File 'lib/graphql/language/selection_set.rb', line 49

def evaluate(context, object_type, object, serially: false)
  grouped_fields = collect_fields(context, object_type)

  grouped_fields.reduce({}) do |memo, (key, fields)|

    field = fields.first

    field_definition = case
    when GraphQL::Introspection.meta_field?(field.name)
      GraphQL::Introspection.meta_field(field.name)
    else
      object_type.field(field.name)
    end

    unless field_definition.nil?
      context[:field_name] = field.name
      value = Execution::Pool.future do
        resolved_value  = field.resolve(context, object_type, object)
        resolved_value  = resolved_value.value if resolved_value.is_a?(Celluloid::Future)
        complete_value(context, field_definition.type, resolved_value, merge_selection_sets(fields))
      end

      memo[key.to_sym] = serially ? value.value : value
    end

    memo
  end
end

#merge_selection_sets(fields) ⇒ Object

GraphQL Specification

6.4.1 Field entries
  MergeSelectionSets implementations
    fields



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# File 'lib/graphql/language/selection_set.rb', line 129

def merge_selection_sets(fields)
  selections = fields.reduce([]) do |memo, field|
    memo.concat field.selection_set.selections unless field.selection_set.nil? || field.selection_set.empty?
    memo
  end

  SelectionSet.new(selections)
end