Class: GraphQL::Schema::Field

Inherits:
Object
  • Object
show all
Extended by:
FindInheritedValue
Includes:
GraphQL::Schema::FindInheritedValue::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, FieldImplementationFailed, MissingReturnTypeError, ScopeExtension

Constant Summary

Constants included from Member::HasDirectives

Member::HasDirectives::NO_DIRECTIVES

Constants included from GraphQL::Schema::FindInheritedValue::EmptyObjects

GraphQL::Schema::FindInheritedValue::EmptyObjects::EMPTY_ARRAY, GraphQL::Schema::FindInheritedValue::EmptyObjects::EMPTY_HASH

Constants included from Member::HasArguments

Member::HasArguments::NO_ARGUMENTS

Instance Attribute Summary collapse

Attributes included from Member::HasDeprecationReason

#deprecation_reason

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Member::HasDirectives

add_directive, #directive, #directives, get_directives, #remove_directive, remove_directive

Methods included from Member::HasValidators

#validates, #validators

Methods included from Member::HasPath

#path

Methods included from Member::HasAstNode

#ast_node

Methods included from Member::HasArguments::FieldConfigured

#all_argument_definitions, #arguments

Methods included from Member::HasArguments

#add_argument, #all_argument_definitions, #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_given, &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



222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
 
# File 'lib/graphql/schema/field.rb', line 222

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_given, &definition_block)
  if name.nil?
    raise ArgumentError, "missing first `name` argument or keyword `name:`"
  end
  if !(resolver_class)
    if type.nil?
      raise ArgumentError, "missing second `type` argument or keyword `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 = 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
  @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

  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
  @call_after_define = false
  # This should run before connection extension,
  # but should it run after the definition block?
  if scoped?
    self.extension(ScopeExtension)
  end

  # The problem with putting this after the definition_block
  # is that it would override arguments
  if connection? && connection_extension
    self.extension(connection_extension)
  end

  # Do this last so we have as much context as possible when initializing them:
  if extensions.any?
    self.extensions(extensions)
  end

  if resolver_class && resolver_class.extensions.any?
    self.extensions(resolver_class.extensions)
  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 definition_block
    if definition_block.arity == 1
      yield self
    else
      instance_eval(&definition_block)
    end
  end

  self.extensions.each(&:after_define_apply)
  @call_after_define = true
end

Instance Attribute Details

#description(text = nil) ⇒ String

Parameters:

  • text (String) (defaults to: nil)

Returns:

  • (String) 


369
370
371
372
373
374
375
376
377
378
379
 
# File 'lib/graphql/schema/field.rb', line 369

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.



33
34
35
 
# File 'lib/graphql/schema/field.rb', line 33

def dig_keys
  @dig_keys
end

#hash_key ⇒ Object (readonly)

Returns the value of attribute hash_key.



32
33
34
 
# 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



30
31
32
 
# 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



27
28
29
 
# 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



21
22
23
 
# 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



59
60
61
 
# File 'lib/graphql/schema/field.rb', line 59

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)



45
46
47
 
# File 'lib/graphql/schema/field.rb', line 45

def owner
  @owner
end

#relay_node_field ⇒ Object (readonly)

Returns Boolean.

Returns:

  • Boolean



184
185
186
 
# File 'lib/graphql/schema/field.rb', line 184

def relay_node_field
  @relay_node_field
end

#relay_nodes_field ⇒ Object (readonly)

Returns Boolean.

Returns:

  • Boolean



186
187
188
 
# File 'lib/graphql/schema/field.rb', line 186

def relay_nodes_field
  @relay_nodes_field
end

#subscription_scope ⇒ String?

Returns:

  • (String, nil) 


81
82
83
 
# File 'lib/graphql/schema/field.rb', line 81

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)



78
79
80
 
# File 'lib/graphql/schema/field.rb', line 78

def trace
  @trace
end

#type ⇒ Object 



580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
 
# File 'lib/graphql/schema/field.rb', line 580

def 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)
  else
    @type ||= Member::BuildType.parse_type(@return_type_expr, null: @return_type_null)
  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:



175
176
177
178
179
180
181
 
# File 'lib/graphql/schema/field.rb', line 175

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


97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
 
# File 'lib/graphql/schema/field.rb', line 97

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) 


606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
 
# File 'lib/graphql/schema/field.rb', line 606

def authorized?(object, args, context)
  if @resolver_class
    # The resolver _instance_ will check itself during `resolve()`
    @resolver_class.authorized?(object, context)
  else
    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
    if args.size > 0
      args = context.warden.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:



357
358
359
360
361
362
363
364
365
 
# File 'lib/graphql/schema/field.rb', line 357

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 



456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
 
# File 'lib/graphql/schema/field.rb', line 456

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
    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)

      if (page_info_lookahead = lookahead.selection(:page_info)).selected?
        metadata_complexity += 1 # pageInfo
        metadata_complexity += page_info_lookahead.selections.size # subfields
      end

      if lookahead.selects?(:total) || lookahead.selects?(:total_count) || lookahead.selects?(:count)
        metadata_complexity += 1
      end

      nodes_edges_complexity = 0
      nodes_edges_complexity += 1 if lookahead.selects?(:edges)
      nodes_edges_complexity += 1 if lookahead.selects?(:nodes)

      # Possible bug: selections on `edges` and `nodes` are _both_ multiplied here. Should they be?
      items_complexity = child_complexity - metadata_complexity - nodes_edges_complexity
      # Add 1 for _this_ field
      1 + (max_possible_page_size * items_complexity) + metadata_complexity + nodes_edges_complexity
    end
  else
    defined_complexity = complexity
    case defined_complexity
    when Proc
      arguments = query.arguments_for(nodes.first, self)
      if arguments.is_a?(GraphQL::ExecutionError)
        return child_complexity
      elsif arguments.respond_to?(:keyword_arguments)
        arguments = arguments.keyword_arguments
      end

      defined_complexity.call(query.context, arguments, child_complexity)
    when Numeric
      defined_complexity + child_complexity
    else
      raise("Invalid complexity: #{defined_complexity.inspect} on #{path} (#{inspect})")
    end
  end
end

#complexity(new_complexity = nil) ⇒ Object 



521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
 
# File 'lib/graphql/schema/field.rb', line 521

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



130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
 
# File 'lib/graphql/schema/field.rb', line 130

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)
    else
      # As a last ditch, try to force loading the return type:
      type.unwrap.name
    end
    @connection = return_type_name.end_with?("Connection")
  else
    @connection
  end
end

#default_page_size ⇒ Integer?

Returns Applied to connections if #has_default_page_size?.

Returns:



567
568
569
570
571
572
573
574
575
 
# File 'lib/graphql/schema/field.rb', line 567

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

#extension(extension_class, options = nil) ⇒ 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:

  • extension_class (Class) —

    subclass of GraphQL::Schema::FieldExtension

  • options (Hash) (defaults to: nil) —

    if provided, given as options: when initializing extension.



421
422
423
424
425
426
427
428
429
430
431
 
# File 'lib/graphql/schema/field.rb', line 421

def extension(extension_class, options = nil)
  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) ⇒ 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:



396
397
398
399
400
401
402
403
404
405
406
407
408
 
# File 'lib/graphql/schema/field.rb', line 396

def extensions(new_extensions = nil)
  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, options)
      else
        self.extension(extension_config)
      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>) 


438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
 
# File 'lib/graphql/schema/field.rb', line 438

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:



758
759
760
761
762
763
764
765
766
 
# File 'lib/graphql/schema/field.rb', line 758

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.



562
563
564
 
# File 'lib/graphql/schema/field.rb', line 562

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.



546
547
548
 
# File 'lib/graphql/schema/field.rb', line 546

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

#inspect ⇒ Object 



71
72
73
 
# File 'lib/graphql/schema/field.rb', line 71

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?



67
68
69
 
# File 'lib/graphql/schema/field.rb', line 67

def introspection?
  @introspection
end

#max_page_size ⇒ Integer?

Returns Applied to connections if #has_max_page_size?.

Returns:



551
552
553
554
555
556
557
558
559
 
# File 'lib/graphql/schema/field.rb', line 551

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?



189
190
191
 
# File 'lib/graphql/schema/field.rb', line 189

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)



48
49
50
51
52
53
54
55
56
 
# File 'lib/graphql/schema/field.rb', line 48

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:



654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
 
# File 'lib/graphql/schema/field.rb', line 654

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

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

  query_ctx.schema.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_given ? @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[@method_str]
          elsif @fallback_value != :not_given
            @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_given
          @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
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



62
63
64
 
# File 'lib/graphql/schema/field.rb', line 62

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



36
37
38
39
40
41
42
 
# 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



148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
 
# File 'lib/graphql/schema/field.rb', line 148

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) 


598
599
600
601
602
603
604
 
# File 'lib/graphql/schema/field.rb', line 598

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