Class: GraphQL::Schema::Field

Inherits:
Object
  • Object
show all
Extended by:
FindInheritedValue
Includes:
GraphQL::Schema::FindInheritedValue::EmptyObjects, Member::AcceptsDefinition, Member::CachedGraphQLDefinition, Member::HasArguments, Member::HasAstNode, Member::HasPath
Defined in:
lib/graphql/schema/field.rb,
lib/graphql/schema/field/scope_extension.rb,
lib/graphql/schema/field/connection_extension.rb

Direct Known Subclasses

Types::Relay::BaseField

Defined Under Namespace

Classes: ConnectionExtension, ScopeExtension

Constant Summary

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

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Member::HasPath

#path

Methods included from Member::HasAstNode

#ast_node

Methods included from Member::HasArguments

#add_argument, #argument, #argument_class, #arguments, #coerce_arguments, #own_arguments

Methods included from Member::CachedGraphQLDefinition

#graphql_definition, #initialize_copy, #type_class

Constructor Details

#initialize(type: nil, name: nil, owner: nil, null: nil, field: nil, function: nil, description: nil, deprecation_reason: nil, method: nil, hash_key: nil, resolver_method: nil, resolve: nil, connection: nil, max_page_size: :not_given, scope: nil, introspection: false, camelize: true, trace: nil, complexity: 1, ast_node: nil, extras: [], 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, arguments: EMPTY_HASH, &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)

    true if this field may return null, false if it is never null

  • description (String) (defaults to: nil)

    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)

  • 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_given)

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

  • introspection (Boolean) (defaults to: false)

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

  • resolve (<#call(obj, args, ctx)>) (defaults to: nil)

    deprecated for compatibility with <1.8.0

  • field (GraphQL::Field, GraphQL::Schema::Field) (defaults to: nil)

    deprecated for compatibility with <1.8.0

  • function (GraphQL::Function) (defaults to: nil)

    deprecated for compatibility with <1.8.0

  • 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: 1)

    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)

  • trace (Boolean) (defaults to: nil)

    If true, a Tracing tracer will measure this scalar field

  • 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


196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
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
# File 'lib/graphql/schema/field.rb', line 196

def initialize(type: nil, name: nil, owner: nil, null: nil, field: nil, function: nil, description: nil, deprecation_reason: nil, method: nil, hash_key: nil, resolver_method: nil, resolve: nil, connection: nil, max_page_size: :not_given, scope: nil, introspection: false, camelize: true, trace: nil, complexity: 1, ast_node: nil, extras: [], 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, arguments: EMPTY_HASH, &definition_block)
  if name.nil?
    raise ArgumentError, "missing first `name` argument or keyword `name:`"
  end
  if !(field || function || resolver_class)
    if type.nil?
      raise ArgumentError, "missing second `type` argument or keyword `type:`"
    end
    if null.nil?
      raise ArgumentError, "missing keyword argument null:"
    end
  end
  if (field || function || resolve) && extras.any?
    raise ArgumentError, "keyword `extras:` may only be used with method-based resolve and class-based field such as mutation class, please remove `field:`, `function:` or `resolve:`"
  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
  if field.is_a?(GraphQL::Schema::Field)
    raise ArgumentError, "Instead of passing a field as `field:`, use `add_field(field)` to add an already-defined field."
  else
    @field = field
  end
  @function = function
  @resolve = resolve
  @deprecation_reason = deprecation_reason

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

  # TODO: I think non-string/symbol hash keys are wrongly normalized (eg `1` will not work)
  method_name = method || hash_key || @underscored_name
  resolver_method ||= @underscored_name.to_sym

  @method_str = method_name.to_s
  @method_sym = method_name.to_sym
  @resolver_method = resolver_method
  @complexity = complexity
  @return_type_expr = type
  @return_type_null = null
  @connection = connection
  @has_max_page_size = max_page_size != :not_given
  @max_page_size = max_page_size == :not_given ? nil : max_page_size
  @introspection = introspection
  @extras = extras
  @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

  arguments.each do |name, arg|
    if arg.is_a?(Hash)
      argument(name: name, **arg)
    else
      own_arguments[name] = arg
    end
  end

  @owner = owner
  @subscription_scope = subscription_scope

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

  if definition_block
    if definition_block.arity == 1
      yield self
    else
      instance_eval(&definition_block)
    end
  end
end

Instance Attribute Details

#deprecation_reasonString?

Returns If present, the field is marked as deprecated with this documentation.

Returns:

  • (String, nil)

    If present, the field is marked as deprecated with this documentation


28
29
30
# File 'lib/graphql/schema/field.rb', line 28

def deprecation_reason
  @deprecation_reason
end

#description(text = nil) ⇒ String

Parameters:

  • text (String) (defaults to: nil)

Returns:

  • (String)

300
301
302
303
304
305
306
# File 'lib/graphql/schema/field.rb', line 300

def description(text = nil)
  if text
    @description = text
  else
    @description
  end
end

#max_page_sizeInteger? (readonly)

Returns Applied to connections if #has_max_page_size?.

Returns:


396
397
398
# File 'lib/graphql/schema/field.rb', line 396

def max_page_size
  @max_page_size
end

#method_strString (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


34
35
36
# File 'lib/graphql/schema/field.rb', line 34

def method_str
  @method_str
end

#method_symSymbol (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


31
32
33
# File 'lib/graphql/schema/field.rb', line 31

def method_sym
  @method_sym
end

#nameString (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


22
23
24
# File 'lib/graphql/schema/field.rb', line 22

def name
  @name
end

#original_nameSymbol (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


43
44
45
# File 'lib/graphql/schema/field.rb', line 43

def original_name
  @original_name
end

#ownerClass

Returns The type that this field belongs to.

Returns:

  • (Class)

    The type that this field belongs to


40
41
42
# File 'lib/graphql/schema/field.rb', line 40

def owner
  @owner
end

#relay_node_fieldObject (readonly)

Returns Boolean.

Returns:

  • Boolean


163
164
165
# File 'lib/graphql/schema/field.rb', line 163

def relay_node_field
  @relay_node_field
end

#resolver_methodSymbol (readonly)

Returns The method on the type to look up.

Returns:

  • (Symbol)

    The method on the type to look up


37
38
39
# File 'lib/graphql/schema/field.rb', line 37

def resolver_method
  @resolver_method
end

#subscription_scopeString?

Returns:

  • (String, nil)

61
62
63
# File 'lib/graphql/schema/field.rb', line 61

def subscription_scope
  @subscription_scope
end

#traceBoolean (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)


58
59
60
# File 'lib/graphql/schema/field.rb', line 58

def trace
  @trace
end

#typeObject


470
471
472
473
474
475
476
477
478
479
480
481
482
483
# File 'lib/graphql/schema/field.rb', line 470

def type
  @type ||= if @function
    Member::BuildType.parse_type(@function.type, null: false)
  elsif @field
    Member::BuildType.parse_type(@field.type, null: false)
  else
    Member::BuildType.parse_type(@return_type_expr, null: @return_type_null)
  end
rescue GraphQL::Schema::InvalidDocumentError => err
  # Let this propagate up
  raise err
rescue StandardError => err
  raise ArgumentError, "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:


154
155
156
157
158
159
160
# File 'lib/graphql/schema/field.rb', line 154

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

74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
# File 'lib/graphql/schema/field.rb', line 74

def self.from_options(name = nil, type = nil, desc = nil, resolver: nil, mutation: nil, subscription: nil,**kwargs, &block)
  if kwargs[:field]
    if kwargs[:field] == GraphQL::Relay::Node.field
      warn("Legacy-style `GraphQL::Relay::Node.field` is being added to a class-based type. See `GraphQL::Types::Relay::NodeField` for a replacement.")
      return GraphQL::Types::Relay::NodeField
    elsif kwargs[:field] == GraphQL::Relay::Node.plural_field
      warn("Legacy-style `GraphQL::Relay::Node.plural_field` is being added to a class-based type. See `GraphQL::Types::Relay::NodesField` for a replacement.")
      return GraphQL::Types::Relay::NodesField
    end
  end

  if (parent_config = resolver || mutation || subscription)
    # Get the parent config, merge in local overrides
    kwargs = parent_config.field_options.merge(kwargs)
    # Add a reference to that parent class
    kwargs[:resolver_class] = parent_config
  end

  if name
    kwargs[:name] = name
  end

  if !type.nil?
    if type.is_a?(GraphQL::Field)
      raise ArgumentError, "A GraphQL::Field was passed as the second argument, use the `field:` keyword for this instead."
    end
    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 (kwargs[:field] || kwargs[:function] || resolver || mutation) && type.is_a?(String)
      # The return type should be copied from `field` or `function`, and the second positional argument is the description
      kwargs[:description] = type
    else
      kwargs[:type] = type
    end
  end
  new(**kwargs, &block)
end

Instance Method Details

#accessible?(context) ⇒ Boolean

Returns:

  • (Boolean)

493
494
495
496
497
498
499
# File 'lib/graphql/schema/field.rb', line 493

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

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

Returns:

  • (Boolean)

501
502
503
504
505
506
507
508
509
510
511
512
513
514
# File 'lib/graphql/schema/field.rb', line 501

def authorized?(object, args, context)
  if @resolver_class
    # The resolver will check itself during `resolve()`
    @resolver_class.authorized?(object, context)
  else
    # Faster than `.any?`
    arguments.each_value do |arg|
      if args.key?(arg.keyword) && !arg.authorized?(object, args[arg.keyword], context)
        return false
      end
    end
    true
  end
end

#complexity(new_complexity = nil) ⇒ Object


370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
# File 'lib/graphql/schema/field.rb', line 370

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
    @complexity
  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


119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
# File 'lib/graphql/schema/field.rb', line 119

def connection?
  if @connection.nil?
    # Provide default based on type name
    return_type_name = if (contains_type = @field || @function)
      Member::BuildType.to_type_name(contains_type.type)
    elsif @return_type_expr
      Member::BuildType.to_type_name(@return_type_expr)
    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

#extension(extension, options = nil) ⇒ Object

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)

    subclass of Schema::Fieldextension

  • options (Object) (defaults to: nil)

    if provided, given as options: when initializing extension.


351
352
353
# File 'lib/graphql/schema/field.rb', line 351

def extension(extension, options = nil)
  extensions([{extension => options}])
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 => Object>>)

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

Returns:


323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
# File 'lib/graphql/schema/field.rb', line 323

def extensions(new_extensions = nil)
  if new_extensions.nil?
    # Read the value
    @extensions
  else
    new_extensions.each do |extension|
      if extension.is_a?(Hash)
        extension = extension.to_a[0]
        extension_class, options = *extension
        @extensions << extension_class.new(field: self, options: options)
      else
        extension_class = extension
        @extensions << extension_class.new(field: self, options: nil)
      end
    end
  end
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>)

360
361
362
363
364
365
366
367
368
# File 'lib/graphql/schema/field.rb', line 360

def extras(new_extras = nil)
  if new_extras.nil?
    # Read the value
    @extras
  else
    # Append to the set of extras on this field
    @extras.concat(new_extras)
  end
end

#fetch_extra(extra_name, ctx) ⇒ Object


636
637
638
639
640
641
642
643
644
# File 'lib/graphql/schema/field.rb', line 636

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_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.


391
392
393
# File 'lib/graphql/schema/field.rb', line 391

def has_max_page_size?
  @has_max_page_size
end

#introspection?Boolean

Returns Is this field a predefined introspection field?.

Returns:

  • (Boolean)

    Is this field a predefined introspection field?


51
52
53
# File 'lib/graphql/schema/field.rb', line 51

def introspection?
  @introspection
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?


166
167
168
# File 'lib/graphql/schema/field.rb', line 166

def method_conflict_warning?
  @method_conflict_warning
end

#resolve(object, args, ctx) ⇒ Object

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

Parameters:


552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
# File 'lib/graphql/schema/field.rb', line 552

def resolve(object, args, ctx)
  if @resolve_proc
    raise "Can't run resolve proc for #{path} when using GraphQL::Execution::Interpreter"
  end
  begin
    # Unwrap the GraphQL object to get the application object.
    application_object = object.object
    if self.authorized?(application_object, args, ctx)
      # Apply field extensions
      with_extensions(object, args, ctx) do |extended_obj, extended_args|
        field_receiver = if @resolver_class
          resolver_obj = if extended_obj.is_a?(GraphQL::Schema::Object)
            extended_obj.object
          else
            extended_obj
          end
          @resolver_class.new(object: resolver_obj, context: ctx, field: self)
        else
          extended_obj
        end

        if field_receiver.respond_to?(@resolver_method)
          # Call the method with kwargs, if there are any
          if extended_args.any?
            field_receiver.public_send(@resolver_method, **extended_args)
          else
            field_receiver.public_send(@resolver_method)
          end
        else
          resolve_field_method(field_receiver, extended_args, ctx)
        end
      end
    else
      err = GraphQL::UnauthorizedFieldError.new(object: application_object, type: object.class, context: ctx, field: self)
      ctx.schema.unauthorized_field(err)
    end
  rescue GraphQL::UnauthorizedFieldError => err
    err.field ||= self
    ctx.schema.unauthorized_field(err)
  rescue GraphQL::UnauthorizedError => err
    ctx.schema.unauthorized_object(err)
  end
rescue GraphQL::ExecutionError => err
  err
end

#resolve_field(obj, args, ctx) ⇒ Object

Implement Field's resolve API.

Eventually, we might hook up field instances to execution in another way. TBD.


520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
# File 'lib/graphql/schema/field.rb', line 520

def resolve_field(obj, args, ctx)
  ctx.schema.after_lazy(obj) do |after_obj|
    # First, apply auth ...
    query_ctx = ctx.query.context
    # Some legacy fields can have `nil` here, not exactly sure why.
    # @see https://github.com/rmosolgo/graphql-ruby/issues/1990 before removing
    inner_obj = after_obj && after_obj.object
    ctx.schema.after_lazy(to_ruby_args(after_obj, args, ctx)) do |ruby_args|
      if authorized?(inner_obj, ruby_args, query_ctx)
        # Then if it passed, resolve the field
        if @resolve_proc
          # Might be nil, still want to call the func in that case
          with_extensions(inner_obj, ruby_args, query_ctx) do |extended_obj, extended_args|
            # Pass the GraphQL args here for compatibility:
            @resolve_proc.call(extended_obj, args, ctx)
          end
        else
          public_send_field(after_obj, ruby_args, ctx)
        end
      else
        err = GraphQL::UnauthorizedFieldError.new(object: inner_obj, type: obj.class, context: ctx, field: self)
        query_ctx.schema.unauthorized_field(err)
      end
    end
  end
end

#resolve_field_method(obj, ruby_kwargs, ctx) ⇒ Object

Find a way to resolve this field, checking:

  • Hash keys, if the wrapped object is a hash;
  • A method on the wrapped object;
  • Or, raise not implemented.

This can be overridden by defining a method on the object type.

Parameters:


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
# File 'lib/graphql/schema/field.rb', line 608

def resolve_field_method(obj, ruby_kwargs, ctx)
  if obj.object.is_a?(Hash)
    inner_object = obj.object
    if inner_object.key?(@method_sym)
      inner_object[@method_sym]
    else
      inner_object[@method_str]
    end
  elsif obj.object.respond_to?(@method_sym)
    if ruby_kwargs.any?
      obj.object.public_send(@method_sym, **ruby_kwargs)
    else
      obj.object.public_send(@method_sym)
    end
  else
    raise <<-ERR
  Failed to implement #{@owner.graphql_name}.#{@name}, tried:

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

  To implement this field, define one of the methods above (and check for typos)
  ERR
  end
end

#resolverClass? 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


46
47
48
# File 'lib/graphql/schema/field.rb', line 46

def resolver
  @resolver_class
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


137
138
139
140
141
142
143
144
# File 'lib/graphql/schema/field.rb', line 137

def scoped?
  if !@scope.nil?
    # The default was overridden
    @scope
  else
    @return_type_expr && (@return_type_expr.is_a?(Array) || (@return_type_expr.is_a?(String) && @return_type_expr.include?("[")) || connection?)
  end
end

#to_graphqlGraphQL::Field

Returns:


399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
# File 'lib/graphql/schema/field.rb', line 399

def to_graphql
  field_defn = if @field
    @field.dup
  elsif @function
    GraphQL::Function.build_field(@function)
  else
    GraphQL::Field.new
  end

  field_defn.name = @name
  if @return_type_expr
    field_defn.type = -> { type }
  end

  if @description
    field_defn.description = @description
  end

  if @deprecation_reason
    field_defn.deprecation_reason = @deprecation_reason
  end

  if @resolver_class
    if @resolver_class < GraphQL::Schema::Mutation
      field_defn.mutation = @resolver_class
    end
    field_defn.[:resolver] = @resolver_class
  end

  if !@trace.nil?
    field_defn.trace = @trace
  end

  if @relay_node_field
    field_defn.relay_node_field = @relay_node_field
  end

  if @relay_nodes_field
    field_defn.relay_nodes_field = @relay_nodes_field
  end

  field_defn.resolve = self.method(:resolve_field)
  field_defn.connection = connection?
  field_defn.connection_max_page_size = max_page_size
  field_defn.introspection = @introspection
  field_defn.complexity = @complexity
  field_defn.subscription_scope = @subscription_scope
  field_defn.ast_node = ast_node

  arguments.each do |name, defn|
    arg_graphql = defn.to_graphql
    field_defn.arguments[arg_graphql.name] = arg_graphql
  end

  # Support a passed-in proc, one way or another
  @resolve_proc = if @resolve
    @resolve
  elsif @function
    @function
  elsif @field
    @field.resolve_proc
  end

  # Ok, `self` isn't a class, but this is for consistency with the classes
  field_defn.[:type_class] = self
  field_defn.arguments_class = GraphQL::Query::Arguments.construct_arguments_class(field_defn)
  field_defn
end

#visible?(context) ⇒ Boolean

Returns:

  • (Boolean)

485
486
487
488
489
490
491
# File 'lib/graphql/schema/field.rb', line 485

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