Class: GraphQL::Execution::Interpreter::Runtime Private

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/execution/interpreter/runtime.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

I think it would be even better if we could somehow make continue_field not recursive. “Trampolining” it somehow.

Constant Summary collapse

HALT =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future. 

Object.new
NO_VALUE_GIVEN =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future. 

Object.new

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(query:, response:) ⇒ Runtime

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of Runtime.



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 20

def initialize(query:, response:)
  @query = query
  @schema = query.schema
  @context = query.context
  @interpreter_context = @context.namespace(:interpreter)
  @response = response
  @dead_paths = {}
  @types_at_paths = {}  # A cache of { Class => { String => Schema::Field } }
  # Which assumes that MyObject.get_field("myField") will return the same field
  # during the lifetime of a query

  @fields_cache = Hash.new { |h, k| h[k] = {} }
end

Instance Attribute Details

#context ⇒ GraphQL::Query::Context (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 18

def context
  @context
end

#query ⇒ GraphQL::Query (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 12

def query
  @query
end

#schema ⇒ Class<GraphQL::Schema> (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 15

def schema
  @schema
end

Instance Method Details

#add_dead_path(path) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Mark path as having been permanently nulled out. No values will be added beyond that path.



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 542

def add_dead_path(path)
  dead = @dead_paths
  path.each do |part|
    dead = dead[part] ||= {}
  end
  dead[:__dead] = true
end

#after_lazy(lazy_obj, owner:, field:, path:, scoped_context:, owner_object:, arguments:, eager: false, trace: true) ⇒ GraphQL::Execution::Lazy, Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns If loading object will be deferred, it’s a wrapper over it.

Parameters:

  • obj (Object) —

    Some user-returned value that may want to be batched

  • path (Array<String>)
  • field (GraphQL::Schema::Field)
  • eager (Boolean) (defaults to: false) —

    Set to true for mutation root fields only

  • trace (Boolean) (defaults to: true) —

    If false, don’t wrap this with field tracing

Returns:



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 396

def after_lazy(lazy_obj, owner:, field:, path:, scoped_context:, owner_object:, arguments:, eager: false, trace: true)
  @interpreter_context[:current_object] = owner_object
  @interpreter_context[:current_arguments] = arguments
  @interpreter_context[:current_path] = path
  @interpreter_context[:current_field] = field
  if schema.lazy?(lazy_obj)
    lazy = GraphQL::Execution::Lazy.new(path: path, field: field) do
      @interpreter_context[:current_path] = path
      @interpreter_context[:current_field] = field
      @interpreter_context[:current_object] = owner_object
      @interpreter_context[:current_arguments] = arguments
      context.scoped_context = scoped_context      # Wrap the execution of _this_ method with tracing,
      # but don't wrap the continuation below

      inner_obj = begin
        query.with_error_handling do
          if trace
            query.trace("execute_field_lazy", {owner: owner, field: field, path: path, query: query, object: owner_object, arguments: arguments}) do
              schema.sync_lazy(lazy_obj)
            end
          else
            schema.sync_lazy(lazy_obj)
          end
        end
        rescue GraphQL::ExecutionError, GraphQL::UnauthorizedError => err
          yield(err)
      end
      after_lazy(inner_obj, owner: owner, field: field, path: path, scoped_context: context.scoped_context, owner_object: owner_object, arguments: arguments, eager: eager) do |really_inner_obj|
        yield(really_inner_obj)
      end
    end

    if eager
      lazy.value
    else
      write_in_response(path, lazy)
      lazy
    end
  else
    yield(lazy_obj)
  end
end

#arguments(graphql_object, arg_owner, ast_node_or_hash) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 476

def arguments(graphql_object, arg_owner, ast_node_or_hash)
  # First, normalize all AST or Ruby values to a plain Ruby hash
  args_hash = prepare_args_hash(ast_node_or_hash)  # Then call into the schema to coerce those incoming values

  arg_owner.coerce_arguments(graphql_object, args_hash, context)
end

#authorized_new(type, value, context, path) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 581

def authorized_new(type, value, context, path)
  trace_payload = { context: context, type: type, object: value, path: path }

  auth_val = context.query.trace("authorized", trace_payload) do
    type.authorized_new(value, context)
  end

  if context.schema.lazy?(auth_val)
    GraphQL::Execution::Lazy.new do
      context.query.trace("authorized_lazy", trace_payload) do
        context.schema.sync_lazy(auth_val)
      end
    end
  else
    auth_val
  end
end

#continue_field(path, value, field, type, ast_node, next_selections, is_non_null, owner_object, arguments) ⇒ Lazy, ...

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

The resolver for field returned value. Continue to execute the query, treating value as type (probably the return type of the field).

Use next_selections to resolve object fields, if there are any.

Location information from path and ast_node.

Returns:

  • (Lazy, Array, Hash, Object) —

    Lazy, Array, and Hash are all traversed to resolve lazy values later



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 291

def continue_field(path, value, field, type, ast_node, next_selections, is_non_null, owner_object, arguments) # rubocop:disable Metrics/ParameterLists
  case type.kind.name
  when "SCALAR", "ENUM"
    r = type.coerce_result(value, context)
    write_in_response(path, r)
    r
  when "UNION", "INTERFACE"
    resolved_type_or_lazy = resolve_type(type, value, path)
    after_lazy(resolved_type_or_lazy, owner: type, path: path, scoped_context: context.scoped_context, field: field, owner_object: owner_object, arguments: arguments, trace: false) do |resolved_type|
      possible_types = query.possible_types(type)

      if !possible_types.include?(resolved_type)
        parent_type = field.owner
        type_error = GraphQL::UnresolvedTypeError.new(value, field, parent_type, resolved_type, possible_types)
        schema.type_error(type_error, context)
        write_in_response(path, nil)
        nil
      else
        continue_field(path, value, field, resolved_type, ast_node, next_selections, is_non_null, owner_object, arguments)
      end
    end
  when "OBJECT"
    object_proxy = begin
      authorized_new(type, value, context, path)
    rescue GraphQL::ExecutionError => err
      err
    end
    after_lazy(object_proxy, owner: type, path: path, scoped_context: context.scoped_context, field: field, owner_object: owner_object, arguments: arguments, trace: false) do |inner_object|
      continue_value = continue_value(path, inner_object, field, is_non_null, ast_node)
      if HALT != continue_value
        response_hash = {}
        write_in_response(path, response_hash)
        evaluate_selections(path, context.scoped_context, continue_value, type, next_selections)
        response_hash
      end
    end
  when "LIST"
    response_list = []
    write_in_response(path, response_list)
    inner_type = type.of_type
    idx = 0
    scoped_context = context.scoped_context
    value.each do |inner_value|
      next_path = path.dup
      next_path << idx
      next_path.freeze
      idx += 1
      set_type_at_path(next_path, inner_type)      # This will update `response_list` with the lazy

      after_lazy(inner_value, owner: inner_type, path: next_path, scoped_context: scoped_context, field: field, owner_object: owner_object, arguments: arguments) do |inner_inner_value|
        continue_value = continue_value(next_path, inner_inner_value, field, inner_type.non_null?, ast_node)
        if HALT != continue_value
          continue_field(next_path, continue_value, field, inner_type, ast_node, next_selections, false, owner_object, arguments)
        end
      end
    end
    response_list
  when "NON_NULL"
    inner_type = type.of_type    # Don't `set_type_at_path` because we want the static type,
    # we're going to use that to determine whether a `nil` should be propagated or not.

    continue_field(path, value, field, inner_type, ast_node, next_selections, true, owner_object, arguments)
  else
    raise "Invariant: Unhandled type kind #{type.kind} (#{type})"
  end
end

#continue_value(path, value, field, is_non_null, ast_node) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 245

def continue_value(path, value, field, is_non_null, ast_node)
  if value.nil?
    if is_non_null
      err = GraphQL::InvalidNullError.new(field.owner, field, value)
      write_invalid_null_in_response(path, err)
    else
      write_in_response(path, nil)
    end
    HALT
  elsif value.is_a?(GraphQL::ExecutionError)
    value.path ||= path
    value.ast_node ||= ast_node
    write_execution_errors_in_response(path, [value])
    HALT
  elsif value.is_a?(Array) && value.any? && value.all? { |v| v.is_a?(GraphQL::ExecutionError) }
    value.each_with_index do |error, index|
      error.ast_node ||= ast_node
      error.path ||= path + (field.type.list? ? [index] : [])
    end
    write_execution_errors_in_response(path, value)
    HALT
  elsif value.is_a?(GraphQL::UnauthorizedError)    # this hook might raise & crash, or it might return
    # a replacement value

    next_value = begin
      schema.unauthorized_object(value)
    rescue GraphQL::ExecutionError => err
      err
    end

    continue_value(path, next_value, field, is_non_null, ast_node)
  elsif GraphQL::Execution::Execute::SKIP == value
    HALT
  else
    value
  end
end

#dead_path?(path) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean) 


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# File 'lib/graphql/execution/interpreter/runtime.rb', line 550

def dead_path?(path)
  res = @dead_paths
  path.each do |part|
    if res
      if res[:__dead]
        break
      else
        res = res[part]
      end
    end
  end
  res && res[:__dead]
end

#directives_include?(node, graphql_object, parent_type) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Check Schema::Directive.include? for each directive that’s present

Returns:

  • (Boolean) 


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# File 'lib/graphql/execution/interpreter/runtime.rb', line 379

def directives_include?(node, graphql_object, parent_type)
  node.directives.each do |dir_node|
    dir_defn = schema.directives.fetch(dir_node.name).type_class || raise("Only class-based directives are supported (not #{dir_node.name.inspect})")
    args = arguments(graphql_object, dir_defn, dir_node)
    if !dir_defn.include?(graphql_object, args, context)
      return false
    end
  end
  true
end

#evaluate_selections(path, scoped_context, owner_object, owner_type, selections, root_operation_type: nil) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 119

def evaluate_selections(path, scoped_context, owner_object, owner_type, selections, root_operation_type: nil)
  @interpreter_context[:current_object] = owner_object
  @interpreter_context[:current_path] = path
  selections_by_name = {}
  gather_selections(owner_object, owner_type, selections, selections_by_name)
  selections_by_name.each do |result_name, field_ast_nodes_or_ast_node|
    # As a performance optimization, the hash key will be a `Node` if
    # there's only one selection of the field. But if there are multiple
    # selections of the field, it will be an Array of nodes
    if field_ast_nodes_or_ast_node.is_a?(Array)
      field_ast_nodes = field_ast_nodes_or_ast_node
      ast_node = field_ast_nodes.first
    else
      field_ast_nodes = nil
      ast_node = field_ast_nodes_or_ast_node
    end
    field_name = ast_node.name
    field_defn = @fields_cache[owner_type][field_name] ||= owner_type.get_field(field_name)
    is_introspection = false
    if field_defn.nil?
      field_defn = if owner_type == schema.query && (entry_point_field = schema.introspection_system.entry_point(name: field_name))
        is_introspection = true
        entry_point_field
      elsif (dynamic_field = schema.introspection_system.dynamic_field(name: field_name))
        is_introspection = true
        dynamic_field
      else
        raise "Invariant: no field for #{owner_type}.#{field_name}"
      end
    end
    return_type = field_defn.type

    next_path = path.dup
    next_path << result_name
    next_path.freeze

    # This seems janky, but we need to know
    # the field's return type at this path in order
    # to propagate `null`
    set_type_at_path(next_path, return_type)    # Set this before calling `run_with_directives`, so that the directive can have the latest path

    @interpreter_context[:current_path] = next_path
    @interpreter_context[:current_field] = field_defn

    context.scoped_context = scoped_context
    object = owner_object

    if is_introspection
      object = authorized_new(field_defn.owner, object, context, next_path)
    end

    begin
      kwarg_arguments = arguments(object, field_defn, ast_node)
    rescue GraphQL::ExecutionError => e
      continue_value(next_path, e, field_defn, return_type.non_null?, ast_node)
      next
    end

    # It might turn out that making arguments for every field is slow.
    # If we have to cache them, we'll need a more subtle approach here.
    field_defn.extras.each do |extra|
      case extra
      when :ast_node
        kwarg_arguments[:ast_node] = ast_node
      when :execution_errors
        kwarg_arguments[:execution_errors] = ExecutionErrors.new(context, ast_node, next_path)
      when :path
        kwarg_arguments[:path] = next_path
      when :lookahead
        if !field_ast_nodes
          field_ast_nodes = [ast_node]
        end
        kwarg_arguments[:lookahead] = Execution::Lookahead.new(
          query: query,
          ast_nodes: field_ast_nodes,
          field: field_defn,
        )
      else
        kwarg_arguments[extra] = field_defn.fetch_extra(extra, context)
      end
    end

    @interpreter_context[:current_arguments] = kwarg_arguments

    # Optimize for the case that field is selected only once
    if field_ast_nodes.nil? || field_ast_nodes.size == 1
      next_selections = ast_node.selections
    else
      next_selections = []
      field_ast_nodes.each { |f| next_selections.concat(f.selections) }
    end

    field_result = resolve_with_directives(object, ast_node) do
      # Actually call the field resolver and capture the result
      app_result = begin
        query.with_error_handling do
          query.trace("execute_field", {owner: owner_type, field: field_defn, path: next_path, query: query, object: object, arguments: kwarg_arguments}) do
            field_defn.resolve(object, kwarg_arguments, context)
          end
        end
      rescue GraphQL::ExecutionError => err
        err
      end
      after_lazy(app_result, owner: owner_type, field: field_defn, path: next_path, scoped_context: context.scoped_context, owner_object: object, arguments: kwarg_arguments) do |inner_result|
        continue_value = continue_value(next_path, inner_result, field_defn, return_type.non_null?, ast_node)
        if RawValue === continue_value          # Write raw value directly to the response without resolving nested objects

          write_in_response(next_path, continue_value.resolve)
        elsif HALT != continue_value
          continue_field(next_path, continue_value, field_defn, return_type, ast_node, next_selections, false, object, kwarg_arguments)
        end
      end
    end

    # If this field is a root mutation field, immediately resolve
    # all of its child fields before moving on to the next root mutation field.
    # (Subselections of this mutation will still be resolved level-by-level.)
    if root_operation_type == "mutation"
      Interpreter::Resolve.resolve_all([field_result])
    else
      field_result
    end
  end
end

#final_value ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 34

def final_value
  @response.final_value
end

#gather_selections(owner_object, owner_type, selections, selections_by_name) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 65

def gather_selections(owner_object, owner_type, selections, selections_by_name)
  selections.each do |node|
    # Skip gathering this if the directive says so
    if !directives_include?(node, owner_object, owner_type)
      next
    end

    case node
    when GraphQL::Language::Nodes::Field
      response_key = node.alias || node.name
      selections = selections_by_name[response_key]      # if there was already a selection of this field,
      # use an array to hold all selections,
      # otherise, use the single node to represent the selection

      if selections        # This field was already selected at least once,
        # add this node to the list of selections

        s = Array(selections)
        s << node
        selections_by_name[response_key] = s
      else
        # No selection was found for this field yet
        selections_by_name[response_key] = node
      end
    when GraphQL::Language::Nodes::InlineFragment
      if node.type
        type_defn = schema.get_type(node.type.name)        # Faster than .map{}.include?()

        query.warden.possible_types(type_defn).each do |t|
          if t == owner_type
            gather_selections(owner_object, owner_type, node.selections, selections_by_name)
            break
          end
        end
      else
        # it's an untyped fragment, definitely continue
        gather_selections(owner_object, owner_type, node.selections, selections_by_name)
      end
    when GraphQL::Language::Nodes::FragmentSpread
      fragment_def = query.fragments[node.name]
      type_defn = schema.get_type(fragment_def.type.name)
      possible_types = query.warden.possible_types(type_defn)
      possible_types.each do |t|
        if t == owner_type
          gather_selections(owner_object, owner_type, fragment_def.selections, selections_by_name)
          break
        end
      end
    else
      raise "Invariant: unexpected selection class: #{node.class}"
    end
  end
end

#inspect ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 38

def inspect
  "#<#{self.class.name} response=#{@response.inspect}>"
end

#prepare_args_hash(ast_arg_or_hash_or_value) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 441

def prepare_args_hash(ast_arg_or_hash_or_value)
  case ast_arg_or_hash_or_value
  when Hash
    args_hash = {}
    ast_arg_or_hash_or_value.each do |k, v|
      args_hash[k] = prepare_args_hash(v)
    end
    args_hash
  when Array
    ast_arg_or_hash_or_value.map { |v| prepare_args_hash(v) }
  when GraphQL::Language::Nodes::Field, GraphQL::Language::Nodes::InputObject, GraphQL::Language::Nodes::Directive
    args_hash = {}
    ast_arg_or_hash_or_value.arguments.each do |arg|
      v = prepare_args_hash(arg.value)
      if v != NO_VALUE_GIVEN
        args_hash[arg.name] = v
      end
    end
    args_hash
  when GraphQL::Language::Nodes::VariableIdentifier
    if query.variables.key?(ast_arg_or_hash_or_value.name)
      variable_value = query.variables[ast_arg_or_hash_or_value.name]
      prepare_args_hash(variable_value)
    else
      NO_VALUE_GIVEN
    end
  when GraphQL::Language::Nodes::Enum
    ast_arg_or_hash_or_value.name
  when GraphQL::Language::Nodes::NullValue
    nil
  else
    ast_arg_or_hash_or_value
  end
end

#resolve_type(type, value, path) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 564

def resolve_type(type, value, path)
  trace_payload = { context: context, type: type, object: value, path: path }
  resolved_type = query.trace("resolve_type", trace_payload) do
    query.resolve_type(type, value)
  end

  if schema.lazy?(resolved_type)
    GraphQL::Execution::Lazy.new do
      query.trace("resolve_type_lazy", trace_payload) do
        schema.sync_lazy(resolved_type)
      end
    end
  else
    resolved_type
  end
end

#resolve_with_directives(object, ast_node) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 358

def resolve_with_directives(object, ast_node)
  run_directive(object, ast_node, 0) { yield }
end

#run_directive(object, ast_node, idx) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 362

def run_directive(object, ast_node, idx)
  dir_node = ast_node.directives[idx]
  if !dir_node
    yield
  else
    dir_defn = schema.directives.fetch(dir_node.name)
    if !dir_defn.is_a?(Class)
      dir_defn = dir_defn.type_class || raise("Only class-based directives are supported (not `@#{dir_node.name}`)")
    end
    dir_args = arguments(nil, dir_defn, dir_node)
    dir_defn.resolve(object, dir_args, context) do
      run_directive(object, ast_node, idx + 1) { yield }
    end
  end
end

#run_eager ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

This begins the execution. Some deferred work might be stored up in lazies.



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 45

def run_eager

  root_operation = query.selected_operation
  root_op_type = root_operation.operation_type || "query"
  root_type = schema.root_type_for_operation(root_op_type)
  path = []
  @interpreter_context[:current_object] = query.root_value
  @interpreter_context[:current_path] = path
  object_proxy = authorized_new(root_type, query.root_value, context, path)
  object_proxy = schema.sync_lazy(object_proxy)
  if object_proxy.nil?    # Root .authorized? returned false.

    write_in_response(path, nil)
    nil
  else
    evaluate_selections(path, context.scoped_context, object_proxy, root_type, root_operation.selections, root_operation_type: root_op_type)
    nil
  end
end

#set_type_at_path(path, type) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 528

def set_type_at_path(path, type)
  types = @types_at_paths
  path.each do |part|
    types = types[part] ||= {}
  end  # Use this magic key so that the hash contains:
  # - string keys for nested fields
  # - :__type for the object type of a selection

  types[:__type] ||= type
  nil
end

#type_at(path) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

To propagate nulls, we have to know what the field type was at previous parts of the response. This hash matches the response



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 519

def type_at(path)
  t = @types_at_paths
  path.each do |part|
    t = t[part] || (raise("Invariant: #{part.inspect} not found in #{t}"))
  end
  t = t[:__type]
  t
end

#write_execution_errors_in_response(path, errors) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 491

def write_execution_errors_in_response(path, errors)
  if !dead_path?(path)
    errors.each do |v|
      context.errors << v
    end
    write_in_response(path, nil)
    add_dead_path(path)
  end
end

#write_in_response(path, value) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 501

def write_in_response(path, value)
  if dead_path?(path)
    return
  else
    if value.nil? && path.any? && type_at(path).non_null?      # This nil is invalid, try writing it at the previous spot

      propagate_path = path[0..-2]
      write_in_response(propagate_path, value)
      add_dead_path(propagate_path)
    else
      @response.write(path, value)
    end
  end
end

#write_invalid_null_in_response(path, invalid_null_error) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 483

def write_invalid_null_in_response(path, invalid_null_error)
  if !dead_path?(path)
    schema.type_error(invalid_null_error, context)
    write_in_response(path, nil)
    add_dead_path(path)
  end
end