Class: GraphQL::Schema::Field
- Inherits:
-
Object
- Object
- GraphQL::Schema::Field
- Includes:
- Member::AcceptsDefinition, Member::CachedGraphQLDefinition, Member::HasArguments, 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
Defined Under Namespace
Classes: ConnectionExtension, ScopeExtension
Instance Attribute Summary collapse
-
#deprecation_reason ⇒ String?
If present, the field is marked as deprecated with this documentation.
-
#description(text = nil) ⇒ String
-
#max_page_size ⇒ Integer?
readonly
Applied to connections if present.
-
#method_str ⇒ String
readonly
Method or hash key on the underlying object to look up.
-
#method_sym ⇒ Symbol
readonly
Method or hash key on the underlying object to look up.
-
#name ⇒ String
(also: #graphql_name)
readonly
The GraphQL name for this field, camelized unless
camelize: false
is provided. -
#original_name ⇒ Symobol
readonly
The original name of the field, passed in by the user.
-
#owner ⇒ Class
readonly
The type that this field belongs to.
-
#resolver_method ⇒ Symbol
readonly
The method on the type to look up.
-
#subscription_scope ⇒ String?
readonly
-
#trace ⇒ Boolean
readonly
Apply tracing to this field? (Default: skip scalars, this is the override value).
Class Method Summary collapse
-
.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.
Instance Method Summary collapse
-
#accessible?(context) ⇒ Boolean
-
#authorized?(object, context) ⇒ Boolean
-
#complexity(new_complexity) ⇒ Object
-
#connection? ⇒ Boolean
Can be set with
connection: true|false
or inferred from a type name ending in*Connection
. -
#extension(extension, options = nil) ⇒ Object
Add
extension
to this field, initialized withoptions
if provided. -
#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.
-
#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.
-
#fetch_extra(extra_name, ctx) ⇒ Object
-
#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: nil, scope: nil, introspection: false, camelize: true, trace: nil, complexity: 1, extras: [], extensions: [], resolver_class: nil, subscription_scope: nil, relay_node_field: false, relay_nodes_field: false, arguments: {}, &definition_block) ⇒ Field
constructor
A new instance of Field.
-
#resolve(object, args, ctx) ⇒ Object
This method is called by the interpreter for each field.
-
#resolve_field(obj, args, ctx) ⇒ Object
Implement Field’s resolve API.
-
#resolve_field_method(obj, ruby_kwargs, ctx) ⇒ Object
Find a way to resolve this field, checking:.
-
#resolver ⇒ Class?
(also: #mutation)
The Resolver this field was derived from, if there is one.
-
#scoped? ⇒ Boolean
If true, the return type’s
.scope_items
method will be applied to this field’s return value. -
#to_graphql ⇒ GraphQL::Field
-
#type ⇒ Object
-
#visible?(context) ⇒ Boolean
Methods included from Member::HasPath
Methods included from Member::HasArguments
#add_argument, #argument, #argument_class, #arguments, #own_arguments
Methods included from Member::CachedGraphQLDefinition
#graphql_definition, #initialize_copy
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: nil, scope: nil, introspection: false, camelize: true, trace: nil, complexity: 1, extras: [], extensions: [], resolver_class: nil, subscription_scope: nil, relay_node_field: false, relay_nodes_field: false, arguments: {}, &definition_block) ⇒ Field
Returns a new instance of Field
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# File 'lib/graphql/schema/field.rb', line 161 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: nil, scope: nil, introspection: false, camelize: true, trace: nil, complexity: 1, extras: [], extensions: [], resolver_class: nil, subscription_scope: nil, relay_node_field: false, relay_nodes_field: false, arguments: {}, &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 @underscored_name = -Member::BuildType.underscore(name.to_s) @name = -(camelize ? Member::BuildType.camelize(name.to_s) : name.to_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 @max_page_size = 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 # Override the default from HasArguments @own_arguments = {} 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? self.extension(ConnectionExtension) end if definition_block if definition_block.arity == 1 yield self else instance_eval(&definition_block) end end end |
Instance Attribute Details
#deprecation_reason ⇒ String?
Returns If present, the field is marked as deprecated with this documentation
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# File 'lib/graphql/schema/field.rb', line 25 def deprecation_reason @deprecation_reason end |
#description(text = nil) ⇒ String
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# File 'lib/graphql/schema/field.rb', line 263 def description(text = nil) if text @description = text else @description end end |
#max_page_size ⇒ Integer? (readonly)
Returns Applied to connections if present
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# File 'lib/graphql/schema/field.rb', line 352 def max_page_size @max_page_size end |
#method_str ⇒ String (readonly)
Returns Method or hash key on the underlying object to look up
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# File 'lib/graphql/schema/field.rb', line 31 def method_str @method_str end |
#method_sym ⇒ Symbol (readonly)
Returns Method or hash key on the underlying object to look up
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# File 'lib/graphql/schema/field.rb', line 28 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
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# File 'lib/graphql/schema/field.rb', line 19 def name @name end |
#original_name ⇒ Symobol (readonly)
Returns the original name of the field, passed in by the user
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# File 'lib/graphql/schema/field.rb', line 40 def original_name @original_name end |
#owner ⇒ Class (readonly)
Returns The type that this field belongs to
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# File 'lib/graphql/schema/field.rb', line 37 def owner @owner end |
#resolver_method ⇒ Symbol (readonly)
Returns The method on the type to look up
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# File 'lib/graphql/schema/field.rb', line 34 def resolver_method @resolver_method end |
#subscription_scope ⇒ String? (readonly)
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# File 'lib/graphql/schema/field.rb', line 53 def subscription_scope @subscription_scope end |
#trace ⇒ Boolean (readonly)
Returns Apply tracing to this field? (Default: skip scalars, this is the override value)
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# File 'lib/graphql/schema/field.rb', line 50 def trace @trace end |
Class Method Details
.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.
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# File 'lib/graphql/schema/field.rb', line 66 def self.(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..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
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# File 'lib/graphql/schema/field.rb', line 437 def accessible?(context) if @resolver_class @resolver_class.accessible?(context) else true end end |
#authorized?(object, context) ⇒ Boolean
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# File 'lib/graphql/schema/field.rb', line 445 def (object, context) if @resolver_class # The resolver will check itself during `resolve()` @resolver_class.(object, context) else # Faster than `.any?` arguments.each_value do |arg| if !arg.(object, context) return false end end true end end |
#complexity(new_complexity) ⇒ Object
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# File 'lib/graphql/schema/field.rb', line 333 def complexity(new_complexity) 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 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
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# File 'lib/graphql/schema/field.rb', line 111 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.
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# File 'lib/graphql/schema/field.rb', line 314 def extension(extension, = nil) extensions([{extension => }]) 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.
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# File 'lib/graphql/schema/field.rb', line 286 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, = *extension @extensions << extension_class.new(field: self, 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.
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# File 'lib/graphql/schema/field.rb', line 323 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
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# File 'lib/graphql/schema/field.rb', line 579 def fetch_extra(extra_name, ctx) if extra_name != :path && respond_to?(extra_name) self.public_send(extra_name) elsif ctx.respond_to?(extra_name) ctx.public_send(extra_name) else raise NotImplementedError, "Unknown field extra for #{self.path}: #{extra_name.inspect}" end 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.
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# File 'lib/graphql/schema/field.rb', line 495 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.(application_object, 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) 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.(err) end rescue GraphQL::UnauthorizedFieldError => err err.field ||= self ctx.schema.(err) rescue GraphQL::UnauthorizedError => err ctx.schema.(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.
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# File 'lib/graphql/schema/field.rb', line 464 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 if (inner_obj, query_ctx) ruby_args = to_ruby_args(after_obj, args, 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.(err) 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.
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# File 'lib/graphql/schema/field.rb', line 551 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 |
#resolver ⇒ Class? Also known as: mutation
Returns The Resolver this field was derived from, if there is one
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# File 'lib/graphql/schema/field.rb', line 43 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
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# File 'lib/graphql/schema/field.rb', line 129 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_graphql ⇒ GraphQL::Field
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# File 'lib/graphql/schema/field.rb', line 355 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 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 end |
#type ⇒ Object
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# File 'lib/graphql/schema/field.rb', line 423 def type @type ||= Member::BuildType.parse_type(@return_type_expr, null: @return_type_null) rescue raise ArgumentError, "Failed to build return type for #{@owner.graphql_name}.#{name} from #{@return_type_expr.inspect}: #{$!.}", $!.backtrace end |
#visible?(context) ⇒ Boolean
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# File 'lib/graphql/schema/field.rb', line 429 def visible?(context) if @resolver_class @resolver_class.visible?(context) else true end end |