Class: GraphQL::Schema::Field

Inherits:
Object
  • Object
show all
Extended by:
FindInheritedValue
Includes:
EmptyObjects, Member::HasArguments, Member::HasArguments::FieldConfigured, Member::HasAstNode, Member::HasDeprecationReason, Member::HasDirectives, Member::HasPath, Member::HasValidators
Defined in:
lib/graphql/schema/field.rb,
lib/graphql/schema/field/scope_extension.rb,
lib/graphql/schema/field/connection_extension.rb

Defined Under Namespace

Classes: ConnectionExtension, ExtendedState, FieldImplementationFailed, MissingReturnTypeError, ScopeExtension

Constant Summary

Constants included from EmptyObjects

EmptyObjects::EMPTY_ARRAY, EmptyObjects::EMPTY_HASH

Constants included from Member::HasArguments

Member::HasArguments::NO_ARGUMENTS

Instance Attribute Summary collapse

Attributes included from Member::HasDeprecationReason

#deprecation_reason

Attributes included from Member::HasAstNode

#ast_node

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Member::HasDirectives

add_directive, #directive, get_directives, #inherited, #remove_directive, remove_directive

Methods included from Member::HasValidators

#validates, #validators

Methods included from Member::HasPath

#path

Methods included from Member::HasAstNode

#inherited

Methods included from Member::HasArguments::FieldConfigured

#all_argument_definitions, #any_arguments?, #arguments

Methods included from Member::HasArguments

#add_argument, #all_argument_definitions, #any_arguments?, #argument, #argument_class, #arguments, #arguments_statically_coercible?, #coerce_arguments, #get_argument, #own_arguments, #remove_argument, #validate_directive_argument

Constructor Details

#initialize(type: nil, name: nil, owner: nil, null: nil, description: NOT_CONFIGURED, deprecation_reason: nil, method: nil, hash_key: nil, dig: nil, resolver_method: nil, connection: nil, max_page_size: NOT_CONFIGURED, default_page_size: NOT_CONFIGURED, scope: nil, introspection: false, camelize: true, trace: nil, complexity: nil, ast_node: nil, extras: EMPTY_ARRAY, extensions: EMPTY_ARRAY, connection_extension: self.class.connection_extension, resolver_class: nil, subscription_scope: nil, relay_node_field: false, relay_nodes_field: false, method_conflict_warning: true, broadcastable: NOT_CONFIGURED, arguments: EMPTY_HASH, directives: EMPTY_HASH, validates: EMPTY_ARRAY, fallback_value: NOT_CONFIGURED, dynamic_introspection: false, &definition_block) ⇒ Field

Returns a new instance of Field.

Parameters:

  • name (Symbol) (defaults to: nil) —

    The underscore-cased version of this field name (will be camelized for the GraphQL API)

  • type (Class, GraphQL::BaseType, Array) (defaults to: nil) —

    The return type of this field

  • owner (Class) (defaults to: nil) —

    The type that this field belongs to

  • null (Boolean) (defaults to: nil) —

    (defaults to true) true if this field may return null, false if it is never null

  • description (String) (defaults to: NOT_CONFIGURED) —

    Field description

  • deprecation_reason (String) (defaults to: nil) —

    If present, the field is marked “deprecated” with this message

  • method (Symbol) (defaults to: nil) —

    The method to call on the underlying object to resolve this field (defaults to name)

  • hash_key (String, Symbol) (defaults to: nil) —

    The hash key to lookup on the underlying object (if its a Hash) to resolve this field (defaults to name or name.to_s)

  • dig (Array<String, Symbol>) (defaults to: nil) —

    The nested hash keys to lookup on the underlying hash to resolve this field using dig

  • resolver_method (Symbol) (defaults to: nil) —

    The method on the type to call to resolve this field (defaults to name)

  • connection (Boolean) (defaults to: nil) —

    true if this field should get automagic connection behavior; default is to infer by *Connection in the return type name

  • connection_extension (Class) (defaults to: self.class.connection_extension) —

    The extension to add, to implement connections. If nil, no extension is added.

  • max_page_size (Integer, nil) (defaults to: NOT_CONFIGURED) —

    For connections, the maximum number of items to return from this field, or nil to allow unlimited results.

  • default_page_size (Integer, nil) (defaults to: NOT_CONFIGURED) —

    For connections, the default number of items to return from this field, or nil to return unlimited results.

  • introspection (Boolean) (defaults to: false) —

    If true, this field will be marked as #introspection? and the name may begin with __

  • resolver_class (Class) (defaults to: nil) —

    (Private) A Resolver which this field was derived from. Use resolver: to create a field with a resolver.

  • arguments ({String=>GraphQL::Schema::Argument, Hash}) (defaults to: EMPTY_HASH) —

    Arguments for this field (may be added in the block, also)

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

    If true, the field name will be camelized when building the schema

  • complexity (Numeric) (defaults to: nil) —

    When provided, set the complexity for this field

  • scope (Boolean) (defaults to: nil) —

    If true, the return type’s .scope_items method will be called on the return value

  • subscription_scope (Symbol, String) (defaults to: nil) —

    A key in context which will be used to scope subscription payloads

  • extensions (Array<Class, Hash<Class => Object>>) (defaults to: EMPTY_ARRAY) —

    Named extensions to apply to this field (see also #extension)

  • directives (Hash{Class => Hash}) (defaults to: EMPTY_HASH) —

    Directives to apply to this field

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

    If true, a Tracing tracer will measure this scalar field

  • broadcastable (Boolean) (defaults to: NOT_CONFIGURED) —

    Whether or not this field can be distributed in subscription broadcasts

  • ast_node (Language::Nodes::FieldDefinition, nil) (defaults to: nil) —

    If this schema was parsed from definition, this AST node defined the field

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

    If false, skip the warning if this field’s method conflicts with a built-in method

  • validates (Array<Hash>) (defaults to: EMPTY_ARRAY) —

    Configurations for validating this field

  • fallback_value (Object) (defaults to: NOT_CONFIGURED) —

    A fallback value if the method is not defined



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# File 'lib/graphql/schema/field.rb', line 239

def initialize(type: nil, name: nil, owner: nil, null: nil, description: NOT_CONFIGURED, deprecation_reason: nil, method: nil, hash_key: nil, dig: nil, resolver_method: nil, connection: nil, max_page_size: NOT_CONFIGURED, default_page_size: NOT_CONFIGURED, scope: nil, introspection: false, camelize: true, trace: nil, complexity: nil, ast_node: nil, extras: EMPTY_ARRAY, extensions: EMPTY_ARRAY, connection_extension: self.class.connection_extension, resolver_class: nil, subscription_scope: nil, relay_node_field: false, relay_nodes_field: false, method_conflict_warning: true, broadcastable: NOT_CONFIGURED, arguments: EMPTY_HASH, directives: EMPTY_HASH, validates: EMPTY_ARRAY, fallback_value: NOT_CONFIGURED, dynamic_introspection: false, &definition_block)
  if name.nil?
    raise ArgumentError, "missing first `name` argument or keyword `name:`"
  end
  if !(resolver_class)
    if type.nil? && !block_given?
      raise ArgumentError, "missing second `type` argument, keyword `type:`, or a block containing `type(...)`"
    end
  end
  @original_name = name
  name_s = -name.to_s

  @underscored_name = -Member::BuildType.underscore(name_s)
  @name = -(camelize ? Member::BuildType.camelize(name_s) : name_s)

  @description = description
  @type = @owner_type = @own_validators = @own_directives = @own_arguments = @arguments_statically_coercible = nil # these will be prepared later if necessary

  self.deprecation_reason = deprecation_reason

  if method && hash_key && dig
    raise ArgumentError, "Provide `method:`, `hash_key:` _or_ `dig:`, not multiple. (called with: `method: #{method.inspect}, hash_key: #{hash_key.inspect}, dig: #{dig.inspect}`)"
  end

  if resolver_method
    if method
      raise ArgumentError, "Provide `method:` _or_ `resolver_method:`, not both. (called with: `method: #{method.inspect}, resolver_method: #{resolver_method.inspect}`)"
    end

    if hash_key || dig
      raise ArgumentError, "Provide `hash_key:`, `dig:`, _or_ `resolver_method:`, not multiple. (called with: `hash_key: #{hash_key.inspect}, dig: #{dig.inspect}, resolver_method: #{resolver_method.inspect}`)"
    end
  end

  method_name = method || hash_key || name_s
  @dig_keys = dig
  if hash_key
    @hash_key = hash_key
    @hash_key_str = hash_key.to_s
  else
    @hash_key = NOT_CONFIGURED
    @hash_key_str = NOT_CONFIGURED
  end

  @method_str = -method_name.to_s
  @method_sym = method_name.to_sym
  @resolver_method = (resolver_method || name_s).to_sym
  @complexity = complexity
  @dynamic_introspection = dynamic_introspection
  @return_type_expr = type
  @return_type_null = if !null.nil?
    null
  elsif resolver_class
    nil
  else
    true
  end
  @connection = connection
  @max_page_size = max_page_size
  @default_page_size = default_page_size
  @introspection = introspection
  @extras = extras
  @broadcastable = broadcastable
  @resolver_class = resolver_class
  @scope = scope
  @trace = trace
  @relay_node_field = relay_node_field
  @relay_nodes_field = relay_nodes_field
  @ast_node = ast_node
  @method_conflict_warning = method_conflict_warning
  @fallback_value = fallback_value
  @definition_block = nil

  arguments.each do |name, arg|
    case arg
    when Hash
      argument(name: name, **arg)
    when GraphQL::Schema::Argument
      add_argument(arg)
    when Array
      arg.each { |a| add_argument(a) }
    else
      raise ArgumentError, "Unexpected argument config (#{arg.class}): #{arg.inspect}"
    end
  end

  @owner = owner
  @subscription_scope = subscription_scope

  @extensions = EMPTY_ARRAY
  set_pagination_extensions(connection_extension: connection_extension)
  # Do this last so we have as much context as possible when initializing them:
  if extensions.any?
    self.extensions(extensions, call_after_define: false)
  end

  if resolver_class && resolver_class.extensions.any?
    self.extensions(resolver_class.extensions, call_after_define: false)
  end

  if directives.any?
    directives.each do |(dir_class, options)|
      self.directive(dir_class, **options)
    end
  end

  if !validates.empty?
    self.validates(validates)
  end

  if block_given?
    @definition_block = definition_block
  else
    self.extensions.each(&:after_define_apply)
  end
end

Instance Attribute Details

#description(text = nil) ⇒ String

Parameters:

  • text (String) (defaults to: nil)

Returns:

  • (String) 


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# File 'lib/graphql/schema/field.rb', line 391

def description(text = nil)
  if text
    @description = text
  elsif !NOT_CONFIGURED.equal?(@description)
    @description
  elsif @resolver_class
    @resolver_class.description
  else
    nil
  end
end

#dig_keys ⇒ Object (readonly)

Returns the value of attribute dig_keys.



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# File 'lib/graphql/schema/field.rb', line 33

def dig_keys
  @dig_keys
end

#dynamic_introspection ⇒ Object

Returns the value of attribute dynamic_introspection.



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# File 'lib/graphql/schema/field.rb', line 374

def dynamic_introspection
  @dynamic_introspection
end

#hash_key ⇒ Object (readonly)

Returns the value of attribute hash_key.



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# File 'lib/graphql/schema/field.rb', line 32

def hash_key
  @hash_key
end

#method_str ⇒ String (readonly)

Returns Method or hash key on the underlying object to look up.

Returns:

  • (String) —

    Method or hash key on the underlying object to look up



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# File 'lib/graphql/schema/field.rb', line 30

def method_str
  @method_str
end

#method_sym ⇒ Symbol (readonly)

Returns Method or hash key on the underlying object to look up.

Returns:

  • (Symbol) —

    Method or hash key on the underlying object to look up



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# File 'lib/graphql/schema/field.rb', line 27

def method_sym
  @method_sym
end

#name ⇒ String (readonly) Also known as: graphql_name

Returns the GraphQL name for this field, camelized unless camelize: false is provided.

Returns:

  • (String) —

    the GraphQL name for this field, camelized unless camelize: false is provided



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# File 'lib/graphql/schema/field.rb', line 21

def name
  @name
end

#original_name ⇒ Symbol (readonly)

Returns the original name of the field, passed in by the user.

Returns:

  • (Symbol) —

    the original name of the field, passed in by the user



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# File 'lib/graphql/schema/field.rb', line 71

def original_name
  @original_name
end

#owner ⇒ Class

Returns The thing this field was defined on (type, mutation, resolver).

Returns:

  • (Class) —

    The thing this field was defined on (type, mutation, resolver)



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# File 'lib/graphql/schema/field.rb', line 57

def owner
  @owner
end

#relay_node_field ⇒ Object (readonly)

Returns Boolean.

Returns:

  • Boolean



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# File 'lib/graphql/schema/field.rb', line 201

def relay_node_field
  @relay_node_field
end

#relay_nodes_field ⇒ Object (readonly)

Returns Boolean.

Returns:

  • Boolean



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# File 'lib/graphql/schema/field.rb', line 203

def relay_nodes_field
  @relay_nodes_field
end

#subscription_scope ⇒ String?

Returns:

  • (String, nil) 


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# File 'lib/graphql/schema/field.rb', line 93

def subscription_scope
  @subscription_scope || (@resolver_class.respond_to?(:subscription_scope) ? @resolver_class.subscription_scope : nil)
end

#trace ⇒ Boolean (readonly)

Returns Apply tracing to this field? (Default: skip scalars, this is the override value).

Returns:

  • (Boolean) —

    Apply tracing to this field? (Default: skip scalars, this is the override value)



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# File 'lib/graphql/schema/field.rb', line 90

def trace
  @trace
end

#type(new_type = NOT_CONFIGURED) ⇒ Module, ...

Get or set the return type of this field.

It may return nil if no type was configured or if the given definition block wasn’t called yet.

Parameters:

Returns:



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# File 'lib/graphql/schema/field.rb', line 592

def type(new_type = NOT_CONFIGURED)
  if NOT_CONFIGURED.equal?(new_type)
    if @resolver_class
      return_type = @return_type_expr || @resolver_class.type_expr
      if return_type.nil?
        raise MissingReturnTypeError, "Can't determine the return type for #{self.path} (it has `resolver: #{@resolver_class}`, perhaps that class is missing a `type ...` declaration, or perhaps its type causes a cyclical loading issue)"
      end
      nullable = @return_type_null.nil? ? @resolver_class.null : @return_type_null
      Member::BuildType.parse_type(return_type, null: nullable)
    elsif !@return_type_expr.nil?
      @type ||= Member::BuildType.parse_type(@return_type_expr, null: @return_type_null)
    end
  else
    @return_type_expr = new_type
    # If `type` is set in the definition block, then the `connection_extension: ...` given as a keyword won't be used, hmm...
    # Also, arguments added by `connection_extension` will clobber anything previously defined,
    # so `type(...)` should go first.
    set_pagination_extensions(connection_extension: self.class.connection_extension)
  end
rescue GraphQL::Schema::InvalidDocumentError, MissingReturnTypeError => err
  # Let this propagate up
  raise err
rescue StandardError => err
  raise MissingReturnTypeError, "Failed to build return type for #{@owner.graphql_name}.#{name} from #{@return_type_expr.inspect}: (#{err.class}) #{err.message}", err.backtrace
end

Class Method Details

.connection_extension(new_extension_class = nil) ⇒ Class

This extension is applied to fields when #connection? is true.

You can override it in your base field definition.

Examples:

Configuring a custom extension

class Types::BaseField < GraphQL::Schema::Field
  connection_extension(MyCustomExtension)
end

Returns:



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# File 'lib/graphql/schema/field.rb', line 192

def self.connection_extension(new_extension_class = nil)
  if new_extension_class
    @connection_extension = new_extension_class
  else
    @connection_extension ||= find_inherited_value(:connection_extension, ConnectionExtension)
  end
end

.from_options(name = nil, type = nil, desc = nil, resolver: nil, mutation: nil, subscription: nil, **kwargs, &block) ⇒ GraphQL::Schema:Field

Create a field instance from a list of arguments, keyword arguments, and a block.

This method implements prioritization between the resolver or mutation defaults and the local overrides via other keywords.

It also normalizes positional arguments into keywords for #initialize.

Parameters:

  • resolver (Class) (defaults to: nil) —

    A Resolver class to use for field configuration

  • mutation (Class) (defaults to: nil) —

    A Mutation class to use for field configuration

  • subscription (Class) (defaults to: nil) —

    A Subscription class to use for field configuration

Returns:

  • (GraphQL::Schema:Field) —

    an instance of self

See Also:

  • for other options


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# File 'lib/graphql/schema/field.rb', line 109

def self.from_options(name = nil, type = nil, desc = nil, resolver: nil, mutation: nil, subscription: nil,**kwargs, &block)
  if (resolver_class = resolver || mutation || subscription)
    # Add a reference to that parent class
    kwargs[:resolver_class] = resolver_class
  end

  if name
    kwargs[:name] = name
  end

  if !type.nil?
    if desc
      if kwargs[:description]
        raise ArgumentError, "Provide description as a positional argument or `description:` keyword, but not both (#{desc.inspect}, #{kwargs[:description].inspect})"
      end

      kwargs[:description] = desc
      kwargs[:type] = type
    elsif (resolver || mutation) && type.is_a?(String)
      # The return type should be copied from the resolver, and the second positional argument is the description
      kwargs[:description] = type
    else
      kwargs[:type] = type
    end
    if type.is_a?(Class) && type < GraphQL::Schema::Mutation
      raise ArgumentError, "Use `field #{name.inspect}, mutation: Mutation, ...` to provide a mutation to this field instead"
    end
  end
  new(**kwargs, &block)
end

Instance Method Details

#authorized?(object, args, context) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/graphql/schema/field.rb', line 626

def authorized?(object, args, context)
  if @resolver_class
    # The resolver _instance_ will check itself during `resolve()`
    @resolver_class.authorized?(object, context)
  else
    if args.size > 0
      if (arg_values = context[:current_arguments])
        # ^^ that's provided by the interpreter at runtime, and includes info about whether the default value was used or not.
        using_arg_values = true
        arg_values = arg_values.argument_values
      else
        arg_values = args
        using_arg_values = false
      end

      args = context.types.arguments(self)
      args.each do |arg|
        arg_key = arg.keyword
        if arg_values.key?(arg_key)
          arg_value = arg_values[arg_key]
          if using_arg_values
            if arg_value.default_used?
              # pass -- no auth required for default used
              next
            else
              application_arg_value = arg_value.value
              if application_arg_value.is_a?(GraphQL::Execution::Interpreter::Arguments)
                application_arg_value.keyword_arguments
              end
            end
          else
            application_arg_value = arg_value
          end

          if !arg.authorized?(object, application_arg_value, context)
            return false
          end
        end
      end
    end
    true
  end
end

#broadcastable? ⇒ Boolean?

If true, subscription updates with this field can be shared between viewers

Returns:

  • (Boolean, nil)

See Also:



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# File 'lib/graphql/schema/field.rb', line 379

def broadcastable?
  if !NOT_CONFIGURED.equal?(@broadcastable)
    @broadcastable
  elsif @resolver_class
    @resolver_class.broadcastable?
  else
    nil
  end
end

#calculate_complexity(query:, nodes:, child_complexity:) ⇒ Object 



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# File 'lib/graphql/schema/field.rb', line 478

def calculate_complexity(query:, nodes:, child_complexity:)
  if respond_to?(:complexity_for)
    lookahead = GraphQL::Execution::Lookahead.new(query: query, field: self, ast_nodes: nodes, owner_type: owner)
    complexity_for(child_complexity: child_complexity, query: query, lookahead: lookahead)
  elsif connection?
    arguments = query.arguments_for(nodes.first, self)
    max_possible_page_size = nil
    if arguments.respond_to?(:[]) # It might have been an error
      if arguments[:first]
        max_possible_page_size = arguments[:first]
      end

      if arguments[:last] && (max_possible_page_size.nil? || arguments[:last] > max_possible_page_size)
        max_possible_page_size = arguments[:last]
      end
    elsif arguments.is_a?(GraphQL::UnauthorizedError)
      raise arguments
    end

    if max_possible_page_size.nil?
      max_possible_page_size = default_page_size || query.schema.default_page_size || max_page_size || query.schema.default_max_page_size
    end

    if max_possible_page_size.nil?
      raise GraphQL::Error, "Can't calculate complexity for #{path}, no `first:`, `last:`, `default_page_size`, `max_page_size` or `default_max_page_size`"
    else
      metadata_complexity = 0
      lookahead = GraphQL::Execution::Lookahead.new(query: query, field: self, ast_nodes: nodes, owner_type: owner)

      lookahead.selections.each do |next_lookahead|
        # this includes `pageInfo`, `nodes` and `edges` and any custom fields
        # TODO this doesn't support procs yet -- unlikely to need it.
        metadata_complexity += next_lookahead.field.complexity
        if next_lookahead.name != :nodes && next_lookahead.name != :edges
          # subfields, eg, for pageInfo -- assumes no subselections
          metadata_complexity += next_lookahead.selections.size
        end
      end

      # Possible bug: selections on `edges` and `nodes` are _both_ multiplied here. Should they be?
      items_complexity = child_complexity - metadata_complexity
      subfields_complexity = (max_possible_page_size * items_complexity) + metadata_complexity
      # Apply this field's own complexity
      apply_own_complexity_to(subfields_complexity, query, nodes)
    end
  else
    apply_own_complexity_to(child_complexity, query, nodes)
  end
end

#complexity(new_complexity = nil) ⇒ Object 



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# File 'lib/graphql/schema/field.rb', line 528

def complexity(new_complexity = nil)
  case new_complexity
  when Proc
    if new_complexity.parameters.size != 3
      fail(
        "A complexity proc should always accept 3 parameters: ctx, args, child_complexity. "\
        "E.g.: complexity ->(ctx, args, child_complexity) { child_complexity * args[:limit] }"
      )
    else
      @complexity = new_complexity
    end
  when Numeric
    @complexity = new_complexity
  when nil
    if @resolver_class
      @complexity || @resolver_class.complexity || 1
    else
      @complexity || 1
    end
  else
    raise("Invalid complexity: #{new_complexity.inspect} on #{@name}")
  end
end

#connection? ⇒ Boolean

Can be set with connection: true|false or inferred from a type name ending in *Connection

Returns:

  • (Boolean) —

    if true, this field will be wrapped with Relay connection behavior



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# File 'lib/graphql/schema/field.rb', line 142

def connection?
  if @connection.nil?
    # Provide default based on type name
    return_type_name = if @return_type_expr
      Member::BuildType.to_type_name(@return_type_expr)
    elsif @resolver_class && @resolver_class.type
      Member::BuildType.to_type_name(@resolver_class.type)
    elsif type
      # As a last ditch, try to force loading the return type:
      type.unwrap.name
    end
    if return_type_name
      @connection = return_type_name.end_with?("Connection") && return_type_name != "Connection"
    else
      # TODO set this when type is set by method
      false # not loaded yet?
    end
  else
    @connection
  end
end

#default_page_size ⇒ Integer?

Returns Applied to connections if #has_default_page_size?.

Returns:



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# File 'lib/graphql/schema/field.rb', line 574

def default_page_size
  if !NOT_CONFIGURED.equal?(@default_page_size)
    @default_page_size
  elsif @resolver_class && @resolver_class.has_default_page_size?
    @resolver_class.default_page_size
  else
    nil
  end
end

#directives ⇒ Object 



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# File 'lib/graphql/schema/field.rb', line 44

def directives
  if @resolver_class && (r_dirs = @resolver_class.directives).any?
    if (own_dirs = super).any?
      own_dirs + r_dirs
    else
      r_dirs
    end
  else
    super
  end
end

#ensure_loaded ⇒ self

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.

Calls the definition block, if one was given. This is deferred so that references to the return type can be lazily evaluated, reducing Rails boot time.

Returns:

  • (self) 


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# File 'lib/graphql/schema/field.rb', line 361

def ensure_loaded
  if @definition_block
    if @definition_block.arity == 1
      @definition_block.call(self)
    else
      instance_eval(&@definition_block)
    end
    self.extensions.each(&:after_define_apply)
    @definition_block = nil
  end
  self
end

#extension(extension_class, call_after_define: !@definition_block,, **options) ⇒ void

This method returns an undefined value.

Add extension to this field, initialized with options if provided.

Examples:

adding an extension

extension(MyExtensionClass)

adding an extension with options

extension(MyExtensionClass, filter: true)

Parameters:



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# File 'lib/graphql/schema/field.rb', line 443

def extension(extension_class, call_after_define: !@definition_block, **options)
  extension_inst = extension_class.new(field: self, options: options)
  if @extensions.frozen?
    @extensions = @extensions.dup
  end
  if call_after_define
    extension_inst.after_define_apply
  end
  @extensions << extension_inst
  nil
end

#extensions(new_extensions = nil, call_after_define: !@definition_block)) ⇒ Array<GraphQL::Schema::FieldExtension>

Read extension instances from this field, or add new classes/options to be initialized on this field. Extensions are executed in the order they are added.

Examples:

adding an extension

extensions([MyExtensionClass])

adding multiple extensions

extensions([MyExtensionClass, AnotherExtensionClass])

adding an extension with options

extensions([MyExtensionClass, { AnotherExtensionClass => { filter: true } }])

Parameters:

  • extensions (Array<Class, Hash<Class => Hash>>) —

    Add extensions to this field. For hash elements, only the first key/value is used.

Returns:



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# File 'lib/graphql/schema/field.rb', line 418

def extensions(new_extensions = nil, call_after_define: !@definition_block)
  if new_extensions
    new_extensions.each do |extension_config|
      if extension_config.is_a?(Hash)
        extension_class, options = *extension_config.to_a[0]
        self.extension(extension_class, call_after_define: call_after_define, **options)
      else
        self.extension(extension_config, call_after_define: call_after_define)
      end
    end
  end
  @extensions
end

#extras(new_extras = nil) ⇒ Array<Symbol>

Read extras (as symbols) from this field, or add new extras to be opted into by this field’s resolver.

Parameters:

  • new_extras (Array<Symbol>) (defaults to: nil) —

    Add extras to this field

Returns:

  • (Array<Symbol>) 


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# File 'lib/graphql/schema/field.rb', line 460

def extras(new_extras = nil)
  if new_extras.nil?
    # Read the value
    field_extras = @extras
    if @resolver_class && @resolver_class.extras.any?
      field_extras + @resolver_class.extras
    else
      field_extras
    end
  else
    if @extras.frozen?
      @extras = @extras.dup
    end
    # Append to the set of extras on this field
    @extras.concat(new_extras)
  end
end

#fetch_extra(extra_name, ctx) ⇒ Object

Parameters:



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# File 'lib/graphql/schema/field.rb', line 781

def fetch_extra(extra_name, ctx)
  if extra_name != :path && extra_name != :ast_node && respond_to?(extra_name)
    self.public_send(extra_name)
  elsif ctx.respond_to?(extra_name)
    ctx.public_send(extra_name)
  else
    raise GraphQL::RequiredImplementationMissingError, "Unknown field extra for #{self.path}: #{extra_name.inspect}"
  end
end

#has_default_page_size? ⇒ Boolean

Returns True if this field’s #default_page_size should override the schema default.

Returns:

  • (Boolean) —

    True if this field’s #default_page_size should override the schema default.



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# File 'lib/graphql/schema/field.rb', line 569

def has_default_page_size?
  !NOT_CONFIGURED.equal?(@default_page_size) || (@resolver_class && @resolver_class.has_default_page_size?)
end

#has_max_page_size? ⇒ Boolean

Returns True if this field’s #max_page_size should override the schema default.

Returns:

  • (Boolean) —

    True if this field’s #max_page_size should override the schema default.



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# File 'lib/graphql/schema/field.rb', line 553

def has_max_page_size?
  !NOT_CONFIGURED.equal?(@max_page_size) || (@resolver_class && @resolver_class.has_max_page_size?)
end

#inspect ⇒ Object 



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# File 'lib/graphql/schema/field.rb', line 83

def inspect
  "#<#{self.class} #{path}#{all_argument_definitions.any? ? "(...)" : ""}: #{type.to_type_signature}>"
end

#introspection? ⇒ Boolean

Returns Is this field a predefined introspection field?.

Returns:

  • (Boolean) —

    Is this field a predefined introspection field?



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# File 'lib/graphql/schema/field.rb', line 79

def introspection?
  @introspection
end

#max_page_size ⇒ Integer?

Returns Applied to connections if #has_max_page_size?.

Returns:



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# File 'lib/graphql/schema/field.rb', line 558

def max_page_size
  if !NOT_CONFIGURED.equal?(@max_page_size)
    @max_page_size
  elsif @resolver_class && @resolver_class.has_max_page_size?
    @resolver_class.max_page_size
  else
    nil
  end
end

#method_conflict_warning? ⇒ Boolean

Returns Should we warn if this field’s name conflicts with a built-in method?.

Returns:

  • (Boolean) —

    Should we warn if this field’s name conflicts with a built-in method?



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# File 'lib/graphql/schema/field.rb', line 206

def method_conflict_warning?
  @method_conflict_warning
end

#owner_type ⇒ Class

Returns The GraphQL type this field belongs to. (For fields defined on mutations, it’s the payload type).

Returns:

  • (Class) —

    The GraphQL type this field belongs to. (For fields defined on mutations, it’s the payload type)



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# File 'lib/graphql/schema/field.rb', line 60

def owner_type
  @owner_type ||= if owner.nil?
    raise GraphQL::InvariantError, "Field #{original_name.inspect} (graphql name: #{graphql_name.inspect}) has no owner, but all fields should have an owner. How did this happen?!"
  elsif owner < GraphQL::Schema::Mutation
    owner.payload_type
  else
    owner
  end
end

#resolve(object, args, query_ctx) ⇒ Object

This method is called by the interpreter for each field. You can extend it in your base field classes.

Parameters:



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# File 'lib/graphql/schema/field.rb', line 675

def resolve(object, args, query_ctx)
  # Unwrap the GraphQL object to get the application object.
  application_object = object.object
  method_receiver = nil
  method_to_call = nil
  method_args = nil

  @own_validators && Schema::Validator.validate!(validators, application_object, query_ctx, args)

  query_ctx.query.after_lazy(self.authorized?(application_object, args, query_ctx)) do |is_authorized|
    if is_authorized
      with_extensions(object, args, query_ctx) do |obj, ruby_kwargs|
        method_args = ruby_kwargs
        if @resolver_class
          if obj.is_a?(GraphQL::Schema::Object)
            obj = obj.object
          end
          obj = @resolver_class.new(object: obj, context: query_ctx, field: self)
        end

        inner_object = obj.object

        if !NOT_CONFIGURED.equal?(@hash_key)
          hash_value = if inner_object.is_a?(Hash)
            inner_object.key?(@hash_key) ? inner_object[@hash_key] : inner_object[@hash_key_str]
          elsif inner_object.respond_to?(:[])
            inner_object[@hash_key]
          else
            nil
          end
          if hash_value == false
            hash_value
          else
            hash_value || (@fallback_value != NOT_CONFIGURED ? @fallback_value : nil)
          end
        elsif obj.respond_to?(resolver_method)
          method_to_call = resolver_method
          method_receiver = obj
          # Call the method with kwargs, if there are any
          if ruby_kwargs.any?
            obj.public_send(resolver_method, **ruby_kwargs)
          else
            obj.public_send(resolver_method)
          end
        elsif inner_object.is_a?(Hash)
          if @dig_keys
            inner_object.dig(*@dig_keys)
          elsif inner_object.key?(@method_sym)
            inner_object[@method_sym]
          elsif inner_object.key?(@method_str) || !inner_object.default_proc.nil?
            inner_object[@method_str]
          elsif @fallback_value != NOT_CONFIGURED
            @fallback_value
          else
            nil
          end
        elsif inner_object.respond_to?(@method_sym)
          method_to_call = @method_sym
          method_receiver = obj.object
          if ruby_kwargs.any?
            inner_object.public_send(@method_sym, **ruby_kwargs)
          else
            inner_object.public_send(@method_sym)
          end
        elsif @fallback_value != NOT_CONFIGURED
          @fallback_value
        else
          raise <<-ERR
        Failed to implement #{@owner.graphql_name}.#{@name}, tried:

        - `#{obj.class}##{resolver_method}`, which did not exist
        - `#{inner_object.class}##{@method_sym}`, which did not exist
        - Looking up hash key `#{@method_sym.inspect}` or `#{@method_str.inspect}` on `#{inner_object}`, but it wasn't a Hash

        To implement this field, define one of the methods above (and check for typos), or supply a `fallback_value`.
        ERR
        end
      end
    else
      raise GraphQL::UnauthorizedFieldError.new(object: application_object, type: object.class, context: query_ctx, field: self)
    end
  end
rescue GraphQL::UnauthorizedFieldError => err
  err.field ||= self
  begin
    query_ctx.schema.unauthorized_field(err)
  rescue GraphQL::ExecutionError => err
    err
  end
rescue GraphQL::UnauthorizedError => err
  begin
    query_ctx.schema.unauthorized_object(err)
  rescue GraphQL::ExecutionError => err
    err
  end
rescue ArgumentError
  if method_receiver && method_to_call
    assert_satisfactory_implementation(method_receiver, method_to_call, method_args)
  end
  # if the line above doesn't raise, re-raise
  raise
rescue GraphQL::ExecutionError => err
  err
end

#resolver ⇒ Class? Also known as: mutation

Returns The Resolver this field was derived from, if there is one.

Returns:

  • (Class, nil) —

    The Resolver this field was derived from, if there is one



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# File 'lib/graphql/schema/field.rb', line 74

def resolver
  @resolver_class
end

#resolver_method ⇒ Symbol

Returns The method on the type to look up.

Returns:

  • (Symbol) —

    The method on the type to look up



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# File 'lib/graphql/schema/field.rb', line 36

def resolver_method
  if @resolver_class
    @resolver_class.resolver_method
  else
    @resolver_method
  end
end

#scoped? ⇒ Boolean

Returns if true, the return type’s .scope_items method will be applied to this field’s return value.

Returns:

  • (Boolean) —

    if true, the return type’s .scope_items method will be applied to this field’s return value



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# File 'lib/graphql/schema/field.rb', line 165

def scoped?
  if !@scope.nil?
    # The default was overridden
    @scope
  elsif @return_type_expr
    # Detect a list return type, but don't call `type` since that may eager-load an otherwise lazy-loaded type
    @return_type_expr.is_a?(Array) ||
      (@return_type_expr.is_a?(String) && @return_type_expr.include?("[")) ||
      connection?
  elsif @resolver_class
    resolver_type = @resolver_class.type_expr
    resolver_type.is_a?(Array) ||
      (resolver_type.is_a?(String) && resolver_type.include?("[")) ||
      connection?
  else
    false
  end
end

#visible?(context) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/graphql/schema/field.rb', line 618

def visible?(context)
  if @resolver_class
    @resolver_class.visible?(context)
  else
    true
  end
end