Class: GraphQL::Schema::Field

Inherits:
Object
  • Object
show all
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

Types::Relay::BaseField

Defined Under Namespace

Classes: ConnectionExtension, ScopeExtension

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Member::HasPath

#path

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

Parameters:

  • name (Symbol) —

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

  • type (Class, GraphQL::BaseType, Array) —

    The return type of this field

  • owner (Class) —

    The type that this field belongs to

  • null (Boolean) —

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

  • description (String) —

    Field description

  • deprecation_reason (String) —

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

  • method (Symbol) —

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

  • hash_key (String, Symbol) —

    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) —

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

  • connection (Boolean) —

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

  • max_page_size (Integer) —

    For connections, the maximum number of items to return from this field

  • introspection (Boolean) —

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

  • resolve (<#call(obj, args, ctx)>) —

    deprecated for compatibility with <1.8.0

  • field (GraphQL::Field, GraphQL::Schema::Field) —

    deprecated for compatibility with <1.8.0

  • function (GraphQL::Function) —

    deprecated for compatibility with <1.8.0

  • resolver_class (Class) —

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

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

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

  • camelize (Boolean) —

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

  • complexity (Numeric) —

    When provided, set the complexity for this field

  • scope (Boolean) —

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

  • subscription_scope (Symbol, String) —

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

  • extensions (Array<Class>) —

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

  • trace (Boolean) —

    If true, a Tracing tracer will measure this scalar field



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# File 'lib/graphql/schema/field.rb', line 160

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

  @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

Returns:

  • (String, nil) —

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



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

def deprecation_reason
  @deprecation_reason
end

#description(text = nil) ⇒ String

Parameters:

  • text (String) (defaults to: nil)

Returns:

  • (String) 


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# File 'lib/graphql/schema/field.rb', line 262

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

#extras ⇒ Array<Symbol> (readonly)

Returns:

  • (Array<Symbol>) 


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

def extras
  @extras
end

#max_page_size ⇒ Integer? (readonly)

Returns Applied to connections if present

Returns:

  • (Integer, nil) —

    Applied to connections if present



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# File 'lib/graphql/schema/field.rb', line 323

def max_page_size
  @max_page_size
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 27

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 24

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 15

def name
  @name
end

#original_name ⇒ Symobol (readonly)

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

Returns:

  • (Symobol) —

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



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

def original_name
  @original_name
end

#owner ⇒ Class (readonly)

Returns The type that this field belongs to

Returns:

  • (Class) —

    The type that this field belongs to



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

def owner
  @owner
end

#resolver_method ⇒ Symbol (readonly)

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 30

def resolver_method
  @resolver_method
end

#subscription_scope ⇒ String? (readonly)

Returns:

  • (String, nil) 


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

def subscription_scope
  @subscription_scope
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 49

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.

Parameters:

  • resolver (Class) —

    A Resolver class to use for field configuration

  • mutation (Class) —

    A Mutation class to use for field configuration

  • subscription (Class) —

    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 65

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) 


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# File 'lib/graphql/schema/field.rb', line 408

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

#authorized?(object, context) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/graphql/schema/field.rb', line 416

def authorized?(object, context)
  self_auth = if @resolver_class
    @resolver_class.authorized?(object, context)
  else
    true
  end

  if self_auth
    # Faster than `.any?`
    arguments.each_value do |arg|
      if !arg.authorized?(object, context)
        return false
      end
    end
    true
  else
    false
  end
end

#complexity(new_complexity) ⇒ Object 



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# File 'lib/graphql/schema/field.rb', line 304

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

Returns:

  • (Boolean) —

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



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# File 'lib/graphql/schema/field.rb', line 110

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.

Parameters:

  • extension (Class) —

    subclass of Schema::Fieldextension

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

    if provided, given as options: when initializing extension.



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# File 'lib/graphql/schema/field.rb', line 300

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.

Parameters:

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

    Add extensions to this field

Returns:



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# File 'lib/graphql/schema/field.rb', line 275

def extensions(new_extensions = nil)
  if new_extensions.nil?
    # Read the value
    @extensions
  else
    # Normalize to a Hash of {name => options}
    extensions_with_options = if new_extensions.last.is_a?(Hash)
      new_extensions.pop
    else
      {}
    end
    new_extensions.each do |f|
      extensions_with_options[f] = nil
    end

    # Initialize each class and stash the instance
    extensions_with_options.each do |extension_class, options|
      @extensions << extension_class.new(field: self, options: options)
    end
  end
end

#fetch_extra(extra_name, ctx) ⇒ Object

Parameters:



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# File 'lib/graphql/schema/field.rb', line 552

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.

Parameters:



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# File 'lib/graphql/schema/field.rb', line 471

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, 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.unauthorized_field(err)
    end
  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.

See Also:



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# File 'lib/graphql/schema/field.rb', line 440

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 authorized?(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.unauthorized_field(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.

Parameters:



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# File 'lib/graphql/schema/field.rb', line 524

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

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 39

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



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# File 'lib/graphql/schema/field.rb', line 128

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

#to_graphql ⇒ GraphQL::Field

Returns:



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# File 'lib/graphql/schema/field.rb', line 326

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.metadata[: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.metadata[:type_class] = self

  field_defn
end

#type ⇒ Object 



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# File 'lib/graphql/schema/field.rb', line 394

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}: #{$!.message}", $!.backtrace
end

#visible?(context) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/graphql/schema/field.rb', line 400

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