fix open API playground.

JSONAPI.playground/Pages/OpenAPI Documentation.xcplaygroundpage/Contents.swift

@@ -9,7 +9,7 @@ import Poly
 let encoder = JSONEncoder()
 encoder.outputFormatting = .prettyPrinted
 
-let personSchemaData = try? encoder.encode(Person.openAPINode())
+let personSchemaData = try? encoder.encode(Person.openAPINode(using: encoder))
 
 print("Person Schema")
 print("====")
@@ -30,13 +30,13 @@ print("====")
 print(batchPersonSchemaData.map { String(data: $0, encoding: .utf8)! } ?? "Schema Construction Failed")
 print("====")
 
-let tmp: [String: OpenAPIComponents.SchemasDict.RefType] = [
-	"BatchPerson": try! BatchPeopleDocument.openAPINodeWithExample()
+let tmp: [String: JSONNode] = [
+	"BatchPerson": try! BatchPeopleDocument.openAPINodeWithExample(using: encoder)
 ]
 
-let components = OpenAPIComponents(schemas: tmp)
+let components = OpenAPIComponents(schemas: tmp, parameters: [:])
 
-let batchPeopleRef = JSONReference(type: \OpenAPIComponents.schemas, selector: "BatchPerson")
+let batchPeopleRef = JSONReference.node(.init(type: \OpenAPIComponents.schemas, selector: "BatchPerson"))
 
 let tmp2 = JSONNode.reference(batchPeopleRef)
 

README.md

@@ -843,4 +843,4 @@ This Framework is currently undocumented, but familiarity with `SwiftCheck` will
 # JSONAPI+OpenAPI
 The `JSONAPIOpenAPI` framework adds the ability to generate OpenAPI compliant JSON documentation of a JSONAPI Document.
 
-This library is in its infancy. The documentation will grow as the framework becomes more complete.
+*This library is in its infancy. The documentation will grow as the framework becomes more complete.*

Sources/JSONAPIOpenAPI/JSONAPI/JSONAPIInclude+OpenAPI.swift

@@ -8,9 +8,9 @@
 import JSONAPI
 import Foundation
 
-extension Includes: OpenAPINodeType where I: OpenAPINodeType {
-	public static func openAPINode() throws -> JSONNode {
-		let includeNode = try I.openAPINode()
+extension Includes: OpenAPIEncodedNodeType where I: OpenAPIEncodedNodeType {
+	public static func openAPINode(using encoder: JSONEncoder) throws -> JSONNode {
+		let includeNode = try I.openAPINode(using: encoder)
 
 		return .array(.init(format: .generic,
 							required: true),
@@ -19,114 +19,114 @@ extension Includes: OpenAPINodeType where I: OpenAPINodeType {
 	}
 }
 
-extension Include0: OpenAPINodeType {
-	public static func openAPINode() throws -> JSONNode {
+extension Include0: OpenAPIEncodedNodeType {
+	public static func openAPINode(using encoder: JSONEncoder) throws -> JSONNode {
 		throw OpenAPITypeError.invalidNode
 	}
 }
 
-extension Include1: OpenAPINodeType where A: OpenAPINodeType {
-	public static func openAPINode() throws -> JSONNode {
-		return try .one(of: [A.openAPINode()])
+extension Include1: OpenAPIEncodedNodeType where A: OpenAPIEncodedNodeType {
+	public static func openAPINode(using encoder: JSONEncoder) throws -> JSONNode {
+		return try A.openAPINode(using: encoder)
 	}
 }
 
-extension Include2: OpenAPINodeType where A: OpenAPINodeType, B: OpenAPINodeType {
-	public static func openAPINode() throws -> JSONNode {
+extension Include2: OpenAPIEncodedNodeType where A: OpenAPIEncodedNodeType, B: OpenAPIEncodedNodeType {
+	public static func openAPINode(using encoder: JSONEncoder) throws -> JSONNode {
 		return try .one(of: [
-			A.openAPINode(),
-			B.openAPINode()
+			A.openAPINode(using: encoder),
+			B.openAPINode(using: encoder)
 		])
 	}
 }
 
-extension Include3: OpenAPINodeType where A: OpenAPINodeType, B: OpenAPINodeType, C: OpenAPINodeType {
-	public static func openAPINode() throws -> JSONNode {
+extension Include3: OpenAPIEncodedNodeType where A: OpenAPIEncodedNodeType, B: OpenAPIEncodedNodeType, C: OpenAPIEncodedNodeType {
+	public static func openAPINode(using encoder: JSONEncoder) throws -> JSONNode {
 		return try .one(of: [
-			A.openAPINode(),
-			B.openAPINode(),
-			C.openAPINode()
+			A.openAPINode(using: encoder),
+			B.openAPINode(using: encoder),
+			C.openAPINode(using: encoder)
 			])
 	}
 }
 
-extension Include4: OpenAPINodeType where A: OpenAPINodeType, B: OpenAPINodeType, C: OpenAPINodeType, D: OpenAPINodeType {
-	public static func openAPINode() throws -> JSONNode {
+extension Include4: OpenAPIEncodedNodeType where A: OpenAPIEncodedNodeType, B: OpenAPIEncodedNodeType, C: OpenAPIEncodedNodeType, D: OpenAPIEncodedNodeType {
+	public static func openAPINode(using encoder: JSONEncoder) throws -> JSONNode {
 		return try .one(of: [
-			A.openAPINode(),
-			B.openAPINode(),
-			C.openAPINode(),
-			D.openAPINode()
+			A.openAPINode(using: encoder),
+			B.openAPINode(using: encoder),
+			C.openAPINode(using: encoder),
+			D.openAPINode(using: encoder)
 			])
 	}
 }
 
-extension Include5: OpenAPINodeType where A: OpenAPINodeType, B: OpenAPINodeType, C: OpenAPINodeType, D: OpenAPINodeType, E: OpenAPINodeType {
-	public static func openAPINode() throws -> JSONNode {
+extension Include5: OpenAPIEncodedNodeType where A: OpenAPIEncodedNodeType, B: OpenAPIEncodedNodeType, C: OpenAPIEncodedNodeType, D: OpenAPIEncodedNodeType, E: OpenAPIEncodedNodeType {
+	public static func openAPINode(using encoder: JSONEncoder) throws -> JSONNode {
 		return try .one(of: [
-			A.openAPINode(),
-			B.openAPINode(),
-			C.openAPINode(),
-			D.openAPINode(),
-			E.openAPINode()
+			A.openAPINode(using: encoder),
+			B.openAPINode(using: encoder),
+			C.openAPINode(using: encoder),
+			D.openAPINode(using: encoder),
+			E.openAPINode(using: encoder)
 			])
 	}
 }
 
-extension Include6: OpenAPINodeType where A: OpenAPINodeType, B: OpenAPINodeType, C: OpenAPINodeType, D: OpenAPINodeType, E: OpenAPINodeType, F: OpenAPINodeType {
-	public static func openAPINode() throws -> JSONNode {
+extension Include6: OpenAPIEncodedNodeType where A: OpenAPIEncodedNodeType, B: OpenAPIEncodedNodeType, C: OpenAPIEncodedNodeType, D: OpenAPIEncodedNodeType, E: OpenAPIEncodedNodeType, F: OpenAPIEncodedNodeType {
+	public static func openAPINode(using encoder: JSONEncoder) throws -> JSONNode {
 		return try .one(of: [
-			A.openAPINode(),
-			B.openAPINode(),
-			C.openAPINode(),
-			D.openAPINode(),
-			E.openAPINode(),
-			F.openAPINode()
+			A.openAPINode(using: encoder),
+			B.openAPINode(using: encoder),
+			C.openAPINode(using: encoder),
+			D.openAPINode(using: encoder),
+			E.openAPINode(using: encoder),
+			F.openAPINode(using: encoder)
 			])
 	}
 }
 
-extension Include7: OpenAPINodeType where A: OpenAPINodeType, B: OpenAPINodeType, C: OpenAPINodeType, D: OpenAPINodeType, E: OpenAPINodeType, F: OpenAPINodeType, G: OpenAPINodeType {
-	public static func openAPINode() throws -> JSONNode {
+extension Include7: OpenAPIEncodedNodeType where A: OpenAPIEncodedNodeType, B: OpenAPIEncodedNodeType, C: OpenAPIEncodedNodeType, D: OpenAPIEncodedNodeType, E: OpenAPIEncodedNodeType, F: OpenAPIEncodedNodeType, G: OpenAPIEncodedNodeType {
+	public static func openAPINode(using encoder: JSONEncoder) throws -> JSONNode {
 		return try .one(of: [
-			A.openAPINode(),
-			B.openAPINode(),
-			C.openAPINode(),
-			D.openAPINode(),
-			E.openAPINode(),
-			F.openAPINode(),
-			G.openAPINode()
+			A.openAPINode(using: encoder),
+			B.openAPINode(using: encoder),
+			C.openAPINode(using: encoder),
+			D.openAPINode(using: encoder),
+			E.openAPINode(using: encoder),
+			F.openAPINode(using: encoder),
+			G.openAPINode(using: encoder)
 			])
 	}
 }
 
-extension Include8: OpenAPINodeType where A: OpenAPINodeType, B: OpenAPINodeType, C: OpenAPINodeType, D: OpenAPINodeType, E: OpenAPINodeType, F: OpenAPINodeType, G: OpenAPINodeType, H: OpenAPINodeType {
-	public static func openAPINode() throws -> JSONNode {
+extension Include8: OpenAPIEncodedNodeType where A: OpenAPIEncodedNodeType, B: OpenAPIEncodedNodeType, C: OpenAPIEncodedNodeType, D: OpenAPIEncodedNodeType, E: OpenAPIEncodedNodeType, F: OpenAPIEncodedNodeType, G: OpenAPIEncodedNodeType, H: OpenAPIEncodedNodeType {
+	public static func openAPINode(using encoder: JSONEncoder) throws -> JSONNode {
 		return try .one(of: [
-			A.openAPINode(),
-			B.openAPINode(),
-			C.openAPINode(),
-			D.openAPINode(),
-			E.openAPINode(),
-			F.openAPINode(),
-			G.openAPINode(),
-			H.openAPINode()
+			A.openAPINode(using: encoder),
+			B.openAPINode(using: encoder),
+			C.openAPINode(using: encoder),
+			D.openAPINode(using: encoder),
+			E.openAPINode(using: encoder),
+			F.openAPINode(using: encoder),
+			G.openAPINode(using: encoder),
+			H.openAPINode(using: encoder)
 			])
 	}
 }
 
-extension Include9: OpenAPINodeType where A: OpenAPINodeType, B: OpenAPINodeType, C: OpenAPINodeType, D: OpenAPINodeType, E: OpenAPINodeType, F: OpenAPINodeType, G: OpenAPINodeType, H: OpenAPINodeType, I: OpenAPINodeType {
-	public static func openAPINode() throws -> JSONNode {
+extension Include9: OpenAPIEncodedNodeType where A: OpenAPIEncodedNodeType, B: OpenAPIEncodedNodeType, C: OpenAPIEncodedNodeType, D: OpenAPIEncodedNodeType, E: OpenAPIEncodedNodeType, F: OpenAPIEncodedNodeType, G: OpenAPIEncodedNodeType, H: OpenAPIEncodedNodeType, I: OpenAPIEncodedNodeType {
+	public static func openAPINode(using encoder: JSONEncoder) throws -> JSONNode {
 		return try .one(of: [
-			A.openAPINode(),
-			B.openAPINode(),
-			C.openAPINode(),
-			D.openAPINode(),
-			E.openAPINode(),
-			F.openAPINode(),
-			G.openAPINode(),
-			H.openAPINode(),
-			I.openAPINode()
+			A.openAPINode(using: encoder),
+			B.openAPINode(using: encoder),
+			C.openAPINode(using: encoder),
+			D.openAPINode(using: encoder),
+			E.openAPINode(using: encoder),
+			F.openAPINode(using: encoder),
+			G.openAPINode(using: encoder),
+			H.openAPINode(using: encoder),
+			I.openAPINode(using: encoder)
 			])
 	}
 }

Sources/JSONAPIOpenAPI/JSONAPI/JSONAPITypes+OpenAPI.swift

@@ -53,6 +53,31 @@ extension Attribute: WrappedRawOpenAPIType where RawValue: RawOpenAPINodeType {
 	}
 }
 
+extension Attribute: GenericOpenAPINodeType where RawValue: GenericOpenAPINodeType {
+	public static func genericOpenAPINode(using encoder: JSONEncoder) throws -> JSONNode {
+		// If the RawValue is not required, we actually consider it
+		// nullable. To be not required is for the Attribute itself
+		// to be optional.
+		if try !RawValue.genericOpenAPINode(using: encoder).required {
+			return try RawValue.genericOpenAPINode(using: encoder).requiredNode().nullableNode()
+		}
+		return try RawValue.genericOpenAPINode(using: encoder)
+	}
+}
+
+extension Attribute: DateOpenAPINodeType where RawValue: DateOpenAPINodeType {
+	public static func dateOpenAPINodeGuess(using encoder: JSONEncoder) -> JSONNode? {
+		// If the RawValue is not required, we actually consider it
+		// nullable. To be not required is for the Attribute itself
+		// to be optional.
+		if
+			!(RawValue.dateOpenAPINodeGuess(using: encoder)?.required ?? true) {
+			return RawValue.dateOpenAPINodeGuess(using: encoder)?.requiredNode().nullableNode()
+		}
+		return RawValue.dateOpenAPINodeGuess(using: encoder)
+	}
+}
+
 extension Attribute: AnyJSONCaseIterable where RawValue: CaseIterable, RawValue: Codable {
 	public static func allCases(using encoder: JSONEncoder) -> [AnyCodable] {
 		return (try? allCases(from: Array(RawValue.allCases), using: encoder)) ?? []
@@ -65,18 +90,6 @@ extension Attribute: AnyWrappedJSONCaseIterable where RawValue: AnyJSONCaseItera
 	}
 }
 
-extension Attribute: GenericOpenAPINodeType where RawValue: GenericOpenAPINodeType {
-	public static func genericOpenAPINode(using encoder: JSONEncoder) throws -> JSONNode {
-		return try RawValue.genericOpenAPINode(using: encoder)
-	}
-}
-
-extension Attribute: DateOpenAPINodeType where RawValue: DateOpenAPINodeType {
-	public static func dateOpenAPINodeGuess(using encoder: JSONEncoder) -> JSONNode? {
-		return RawValue.dateOpenAPINodeGuess(using: encoder)
-	}
-}
-
 extension TransformedAttribute: OpenAPINodeType where RawValue: OpenAPINodeType {
 	static public func openAPINode() throws -> JSONNode {
 		// If the RawValue is not required, we actually consider it
@@ -200,7 +213,7 @@ extension ManyResourceBody: OpenAPIEncodedNodeType where Entity: OpenAPIEncodedN
 	}
 }
 
-extension Document: OpenAPIEncodedNodeType where PrimaryResourceBody: OpenAPIEncodedNodeType, IncludeType: OpenAPINodeType {
+extension Document: OpenAPIEncodedNodeType where PrimaryResourceBody: OpenAPIEncodedNodeType, IncludeType: OpenAPIEncodedNodeType {
 	public static func openAPINode(using encoder: JSONEncoder) throws -> JSONNode {
 		// TODO: metadata, links, api description, errors
 		// TODO: represent data and errors as the two distinct possible outcomes
@@ -211,7 +224,7 @@ extension Document: OpenAPIEncodedNodeType where PrimaryResourceBody: OpenAPIEnc
 
 		let includeNode: JSONNode?
 		do {
-			includeNode = try Includes<Include>.openAPINode()
+			includeNode = try Includes<Include>.openAPINode(using: encoder)
 		} catch let err as OpenAPITypeError {
 			guard case .invalidNode = err else {
 				throw err

Sources/JSONAPIOpenAPI/OpenAPI/OpenAPITypes+Codable.swift

@@ -155,7 +155,6 @@ extension JSONNode: Encodable {
 		case oneOf
 		case anyOf
 		case not
-		case reference = "$ref"
 	}
 
 	public func encode(to encoder: Encoder) throws {
@@ -192,16 +191,20 @@ extension JSONNode: Encodable {
 			try container.encode(node, forKey: .not)
 
 		case .reference(let reference):
-			var container = encoder.container(keyedBy: SubschemaCodingKeys.self)
+			var container = encoder.singleValueContainer()
 
-			try container.encode(reference, forKey: .reference)
+			try container.encode(reference)
 		}
 	}
 }
 
 extension JSONReference: Encodable {
+	private enum CodingKeys: String, CodingKey {
+		case ref = "$ref"
+	}
+
 	public func encode(to encoder: Encoder) throws {
-		var container = encoder.singleValueContainer()
+		var container = encoder.container(keyedBy: CodingKeys.self)
 
 		let referenceString: String = {
 			switch self {
@@ -212,7 +215,7 @@ extension JSONReference: Encodable {
 			}
 		}()
 
-		try container.encode(referenceString)
+		try container.encode(referenceString, forKey: .ref)
 	}
 }
 
@@ -241,6 +244,32 @@ extension OpenAPIResponse.Code: Encodable {
 	}
 }
 
+extension OpenAPIRequestBody: Encodable {
+	private enum CodingKeys: String, CodingKey {
+		case description
+		case content
+		case required
+	}
+
+	public func encode(to encoder: Encoder) throws {
+		var container = encoder.container(keyedBy: CodingKeys.self)
+
+		if description != nil {
+			try container.encode(description, forKey: .description)
+		}
+
+		// Hack to work around Dictionary encoding
+		// itself as an array in this case:
+		let stringKeyedDict = Dictionary(
+			content.map { ($0.key.rawValue, $0.value) },
+			uniquingKeysWith: { $1 }
+		)
+		try container.encode(stringKeyedDict, forKey: .content)
+
+		try container.encode(required, forKey: .required)
+	}
+}
+
 extension OpenAPIPathItem.PathProperties.Operation: Encodable {
 	private enum CodingKeys: String, CodingKey {
 		case tags
@@ -276,6 +305,10 @@ extension OpenAPIPathItem.PathProperties.Operation: Encodable {
 
 		try container.encode(parameters, forKey: .parameters)
 
+		if requestBody != nil {
+			try container.encode(requestBody, forKey: .requestBody)
+		}
+
 		// Hack to work around Dictionary encoding
 		// itself as an array in this case:
 		let stringKeyedDict = Dictionary(

Sources/JSONAPIOpenAPI/OpenAPI/OpenAPITypes.swift

@@ -759,7 +759,7 @@ public enum OpenAPIPathItem: Equatable {
 //			public let externalDocs:
 			public let operationId: String
 			public let parameters: ParameterArray
-//			public let requestBody:
+			public let requestBody: OpenAPIRequestBody?
 			public let responses: ResponseMap
 //			public let callbacks:
 			public let deprecated: Bool // default is false
@@ -771,6 +771,7 @@ public enum OpenAPIPathItem: Equatable {
 						description: String? = nil,
 						operationId: String,
 						parameters: ParameterArray,
+						requestBody: OpenAPIRequestBody? = nil,
 						responses: ResponseMap,
 						deprecated: Bool = false) {
 				self.tags = tags
@@ -778,29 +779,44 @@ public enum OpenAPIPathItem: Equatable {
 				self.description = description
 				self.operationId = operationId
 				self.parameters = parameters
+				self.requestBody = requestBody
 				self.responses = responses
 				self.deprecated = deprecated
 			}
 
 			public typealias ResponseMap = [OpenAPIResponse.Code: Either<OpenAPIResponse, JSONReference<OpenAPIComponents, OpenAPIResponse>>]
+
+			public typealias ContentMap = [OpenAPIContentType: OpenAPIContent]
 		}
 	}
 }
 
+public struct OpenAPIRequestBody: Equatable {
+	public let description: String?
+	public let content: OpenAPIPathItem.PathProperties.Operation.ContentMap
+	public let required: Bool
+
+	public init(description: String? = nil,
+				content: OpenAPIPathItem.PathProperties.Operation.ContentMap,
+				required: Bool = true) {
+		self.description = description
+		self.content = content
+		self.required = required
+	}
+}
+
 public struct OpenAPIResponse: Equatable {
 	public let description: String
 //	public let headers:
-	public let content: ContentMap
+	public let content: OpenAPIPathItem.PathProperties.Operation.ContentMap
 //	public let links:
 
 	public init(description: String,
-				content: ContentMap) {
+				content: OpenAPIPathItem.PathProperties.Operation.ContentMap) {
 		self.description = description
 		self.content = content
 	}
 
-	public typealias ContentMap = [ContentType: Content]
-
 	public enum Code: RawRepresentable, Equatable, Hashable {
 		public typealias RawValue = String
 
@@ -825,20 +841,20 @@ public struct OpenAPIResponse: Equatable {
 			}
 		}
 	}
+}
 
-	public enum ContentType: String, Encodable, Equatable, Hashable {
-		case json = "application/json"
-	}
+public enum OpenAPIContentType: String, Encodable, Equatable, Hashable {
+	case json = "application/json"
+}
 
-	public struct Content: Encodable, Equatable {
-		public let schema: Either<JSONNode, JSONReference<OpenAPIComponents, JSONNode>>
-//		public let example:
-//		public let examples:
-//		public let encoding:
+public struct OpenAPIContent: Encodable, Equatable {
+	public let schema: Either<JSONNode, JSONReference<OpenAPIComponents, JSONNode>>
+	//		public let example:
+	//		public let examples:
+	//		public let encoding:
 
-		public init(schema: Either<JSONNode, JSONReference<OpenAPIComponents, JSONNode>>) {
-			self.schema = schema
-		}
+	public init(schema: Either<JSONNode, JSONReference<OpenAPIComponents, JSONNode>>) {
+		self.schema = schema
 	}
 }
 
@@ -933,7 +949,7 @@ public struct OpenAPISchema {
 		}
 
 		public var rawValue: String {
-			return components.joined(separator: "/")
+			return "/\(components.joined(separator: "/"))"
 		}
 
 		public func encode(to encoder: Encoder) throws {

Sources/JSONAPIOpenAPI/OpenAPI/SwiftPrimitiveTypes+OpenAPI.swift

@@ -62,6 +62,12 @@ extension Optional: AnyJSONCaseIterable where Wrapped: CaseIterable, Wrapped: Co
 	}
 }
 
+extension Optional: DateOpenAPINodeType where Wrapped: DateOpenAPINodeType {
+	static public func dateOpenAPINodeGuess(using encoder: JSONEncoder) -> JSONNode? {
+		return Wrapped.dateOpenAPINodeGuess(using: encoder)?.optionalNode()
+	}
+}
+
 extension String: OpenAPINodeType {
 	static public func openAPINode() throws -> JSONNode {
 		return .string(.init(format: .generic,

Tests/JSONAPIOpenAPITests/JSONAPIAttributeOpenAPITests.swift

@@ -802,62 +802,80 @@ extension JSONAPIAttributeOpenAPITests {
 		XCTAssertEqual(numberContext, .init())
 	}
 
-//	func test_NullableEnumAttribute() {
-//		let node = try! Attribute<EnumAttribute?>.wrappedOpenAPINode()
-//
-//		XCTAssertTrue(node.required)
-//		XCTAssertEqual(node.jsonTypeFormat, .string(.generic))
-//
-//		guard case .string(let contextA, let stringContext) = node else {
-//			XCTFail("Expected string Node")
-//			return
-//		}
-//
-//		XCTAssertEqual(contextA, .init(format: .generic,
-//									   required: true,
-//									   nullable: true,
-//									   allowedValues: nil))
-//
-//		XCTAssertEqual(stringContext, .init())
-//	}
-//
-//	func test_OptionalEnumAttribute() {
-//		let node = try! Attribute<EnumAttribute>?.wrappedOpenAPINode()
-//
-//		XCTAssertFalse(node.required)
-//		XCTAssertEqual(node.jsonTypeFormat, .string(.generic))
-//
-//		guard case .string(let contextA, let stringContext) = node else {
-//			XCTFail("Expected string Node")
-//			return
-//		}
-//
-//		XCTAssertEqual(contextA, .init(format: .generic,
-//									   required: false,
-//									   nullable: false,
-//									   allowedValues: nil))
-//
-//		XCTAssertEqual(stringContext, .init())
-//	}
-//
-//	func test_OptionalNullableEnumAttribute() {
-//		let node = try! Attribute<EnumAttribute?>?.wrappedOpenAPINode()
-//
-//		XCTAssertFalse(node.required)
-//		XCTAssertEqual(node.jsonTypeFormat, .string(.generic))
-//
-//		guard case .string(let contextA, let stringContext) = node else {
-//			XCTFail("Expected string Node")
-//			return
-//		}
-//
-//		XCTAssertEqual(contextA, .init(format: .generic,
-//									   required: false,
-//									   nullable: true,
-//									   allowedValues: nil))
-//
-//		XCTAssertEqual(stringContext, .init())
-//	}
+	func test_NullableDateAttribute() {
+		let encoder = JSONEncoder()
+		encoder.outputFormatting = .prettyPrinted
+		encoder.dateEncodingStrategy = .secondsSince1970
+
+		let node = Attribute<Date?>.dateOpenAPINodeGuess(using: encoder)
+
+		XCTAssertNotNil(node)
+
+		XCTAssertTrue(node?.required ?? false)
+		XCTAssertEqual(node?.jsonTypeFormat, .number(.double))
+
+		guard case .number(let contextA, let numberContext)? = node else {
+			XCTFail("Expected string Node")
+			return
+		}
+
+		XCTAssertEqual(contextA, .init(format: .double,
+									   required: true,
+									   nullable: true,
+									   allowedValues: nil))
+
+		XCTAssertEqual(numberContext, .init())
+	}
+
+	func test_OptionalDateAttribute() {
+		let encoder = JSONEncoder()
+		encoder.outputFormatting = .prettyPrinted
+		encoder.dateEncodingStrategy = .secondsSince1970
+
+		let node = Attribute<Date>?.dateOpenAPINodeGuess(using: encoder)
+
+		XCTAssertNotNil(node)
+
+		XCTAssertFalse(node?.required ?? true)
+		XCTAssertEqual(node?.jsonTypeFormat, .number(.double))
+
+		guard case .number(let contextA, let numberContext)? = node else {
+			XCTFail("Expected string Node")
+			return
+		}
+
+		XCTAssertEqual(contextA, .init(format: .double,
+									   required: false,
+									   nullable: false,
+									   allowedValues: nil))
+
+		XCTAssertEqual(numberContext, .init())
+	}
+
+	func test_OptionalNullableDateAttribute() {
+		let encoder = JSONEncoder()
+		encoder.outputFormatting = .prettyPrinted
+		encoder.dateEncodingStrategy = .secondsSince1970
+
+		let node = Attribute<Date?>?.dateOpenAPINodeGuess(using: encoder)
+
+		XCTAssertNotNil(node)
+
+		XCTAssertFalse(node?.required ?? true)
+		XCTAssertEqual(node?.jsonTypeFormat, .number(.double))
+
+		guard case .number(let contextA, let numberContext)? = node else {
+			XCTFail("Expected string Node")
+			return
+		}
+
+		XCTAssertEqual(contextA, .init(format: .double,
+									   required: false,
+									   nullable: true,
+									   allowedValues: nil))
+
+		XCTAssertEqual(numberContext, .init())
+	}
 }
 
 // MARK: - Test Types

Tests/JSONAPIOpenAPITests/JSONAPIDocumentOpenAPITests.swift

@@ -24,7 +24,289 @@ class JSONAPIDocumentOpenAPITests: XCTestCase {
 
 		let node = try! SingleEntityDocument.openAPINodeWithExample(using: encoder)
 
-		print(String(data: try! encoder.encode(node), encoding: .utf8)!)
+		XCTAssertTrue(node.required)
+		XCTAssertEqual(node.jsonTypeFormat, .object(.generic))
+
+		guard case let .object(contextA, objectContext1) = node else {
+			XCTFail("Expected JSON Document to be an Object Node")
+			return
+		}
+
+		XCTAssertNotNil(contextA.example)
+		XCTAssertFalse(contextA.nullable)
+		XCTAssertEqual(contextA.format, .generic)
+		XCTAssertTrue(contextA.required)
+
+		XCTAssertEqual(objectContext1.minProperties, 1)
+		XCTAssertEqual(Set(objectContext1.requiredProperties), Set(["data"]))
+		XCTAssertEqual(Set(objectContext1.properties.keys), Set(["data"]))
+
+		guard case let .object(contextB, objectContext2)? = objectContext1.properties["data"] else {
+			XCTFail("Expected Data field of JSON Document to be an Object Node")
+			return
+		}
+
+		XCTAssertFalse(contextB.nullable)
+		XCTAssertEqual(contextB.format, .generic)
+		XCTAssertTrue(contextB.required)
+
+		XCTAssertEqual(objectContext2.minProperties, 3)
+		XCTAssertEqual(Set(objectContext2.requiredProperties), Set(["id", "attributes", "type"]))
+		XCTAssertEqual(Set(objectContext2.properties.keys), Set(["id", "attributes", "type"]))
+
+		XCTAssertEqual(objectContext2.properties["type"],
+					   JSONNode.string(.init(format: .generic,
+											 required: true,
+											 allowedValues: [.init("test")]),
+									   .init()))
+	}
+
+	func test_ManyResourceDocument() {
+
+		let dateFormatter = DateFormatter()
+		dateFormatter.dateStyle = .medium
+		dateFormatter.timeStyle = .none
+		dateFormatter.locale = Locale(identifier: "en_US")
+
+		let encoder = JSONEncoder()
+		encoder.outputFormatting = .prettyPrinted
+		encoder.dateEncodingStrategy = .formatted(dateFormatter)
+
+		let node = try! ManyEntityDocument.openAPINodeWithExample(using: encoder)
+
+		XCTAssertTrue(node.required)
+		XCTAssertEqual(node.jsonTypeFormat, .object(.generic))
+
+		guard case let .object(contextA, objectContext1) = node else {
+			XCTFail("Expected JSON Document to be an Object Node")
+			return
+		}
+
+		XCTAssertNotNil(contextA.example)
+		XCTAssertFalse(contextA.nullable)
+		XCTAssertEqual(contextA.format, .generic)
+		XCTAssertTrue(contextA.required)
+
+		XCTAssertEqual(objectContext1.minProperties, 1)
+		XCTAssertEqual(Set(objectContext1.requiredProperties), Set(["data"]))
+		XCTAssertEqual(Set(objectContext1.properties.keys), Set(["data"]))
+
+		guard case let .array(contextB, arrayContext)? = objectContext1.properties["data"] else {
+			XCTFail("Expected Data field of JSON Document to be an Array Node")
+			return
+		}
+
+		XCTAssertFalse(contextB.nullable)
+		XCTAssertEqual(contextB.format, .generic)
+		XCTAssertTrue(contextB.required)
+
+		XCTAssertFalse(arrayContext.uniqueItems)
+		XCTAssertEqual(arrayContext.minItems, 0)
+
+		guard case let .object(contextC, objectContext2) = arrayContext.items else {
+			XCTFail("Expected Items of Array under Data to be an Object Node")
+			return
+		}
+
+		XCTAssertFalse(contextC.nullable)
+		XCTAssertEqual(contextC.format, .generic)
+		XCTAssertTrue(contextC.required)
+
+		XCTAssertEqual(objectContext2.minProperties, 3)
+		XCTAssertEqual(Set(objectContext2.requiredProperties), Set(["id", "attributes", "type"]))
+		XCTAssertEqual(Set(objectContext2.properties.keys), Set(["id", "attributes", "type"]))
+
+		XCTAssertEqual(objectContext2.properties["type"],
+					   JSONNode.string(.init(format: .generic,
+											 required: true,
+											 allowedValues: [.init("test")]),
+									   .init()))
+	}
+
+	func test_DocumentWithOneIncludeType() {
+		let dateFormatter = DateFormatter()
+		dateFormatter.dateStyle = .medium
+		dateFormatter.timeStyle = .none
+		dateFormatter.locale = Locale(identifier: "en_US")
+
+		let encoder = JSONEncoder()
+		encoder.outputFormatting = .prettyPrinted
+		encoder.dateEncodingStrategy = .formatted(dateFormatter)
+
+		let node = try! DocumentWithIncludes.openAPINodeWithExample(using: encoder)
+
+		XCTAssertTrue(node.required)
+		XCTAssertEqual(node.jsonTypeFormat, .object(.generic))
+
+		guard case let .object(contextA, objectContext1) = node else {
+			XCTFail("Expected JSON Document to be an Object Node")
+			return
+		}
+
+		XCTAssertNotNil(contextA.example)
+		XCTAssertFalse(contextA.nullable)
+		XCTAssertEqual(contextA.format, .generic)
+		XCTAssertTrue(contextA.required)
+
+		XCTAssertEqual(objectContext1.minProperties, 2)
+		XCTAssertEqual(Set(objectContext1.requiredProperties), Set(["data", "included"]))
+		XCTAssertEqual(Set(objectContext1.properties.keys), Set(["data", "included"]))
+
+		guard case let .object(contextB, objectContext2)? = objectContext1.properties["data"] else {
+			XCTFail("Expected Data field of JSON Document to be an Object Node")
+			return
+		}
+
+		XCTAssertFalse(contextB.nullable)
+		XCTAssertEqual(contextB.format, .generic)
+		XCTAssertTrue(contextB.required)
+
+		XCTAssertEqual(objectContext2.minProperties, 3)
+		XCTAssertEqual(Set(objectContext2.requiredProperties), Set(["id", "attributes", "type"]))
+		XCTAssertEqual(Set(objectContext2.properties.keys), Set(["id", "attributes", "type"]))
+
+		XCTAssertEqual(objectContext2.properties["type"],
+					   JSONNode.string(.init(format: .generic,
+											 required: true,
+											 allowedValues: [.init("test")]),
+									   .init()))
+
+		guard case let .array(contextC, arrayContext)? = objectContext1.properties["included"] else {
+			XCTFail("Expected Includes field of JSON Document to be an Array Node")
+			return
+		}
+
+		XCTAssertFalse(contextC.nullable)
+		XCTAssertEqual(contextC.format, .generic)
+		XCTAssertTrue(contextC.required)
+
+		XCTAssertTrue(arrayContext.uniqueItems)
+		XCTAssertEqual(arrayContext.minItems, 0)
+
+		guard case let .object(contextD, objectContext3) = arrayContext.items else {
+			XCTFail("Expected Items of Array under Data to be an Object Node")
+			return
+		}
+
+		XCTAssertFalse(contextD.nullable)
+		XCTAssertEqual(contextD.format, .generic)
+		XCTAssertTrue(contextD.required)
+
+		XCTAssertEqual(objectContext3.minProperties, 3)
+		XCTAssertEqual(Set(objectContext3.requiredProperties), Set(["id", "attributes", "type"]))
+		XCTAssertEqual(Set(objectContext3.properties.keys), Set(["id", "attributes", "type"]))
+
+		XCTAssertEqual(objectContext3.properties["type"],
+					   JSONNode.string(.init(format: .generic,
+											 required: true,
+											 allowedValues: [.init("test")]),
+									   .init()))
+	}
+
+	func test_DocumentWithTwoIncludeTypes() {
+		let dateFormatter = DateFormatter()
+		dateFormatter.dateStyle = .medium
+		dateFormatter.timeStyle = .none
+		dateFormatter.locale = Locale(identifier: "en_US")
+
+		let encoder = JSONEncoder()
+		encoder.outputFormatting = .prettyPrinted
+		encoder.dateEncodingStrategy = .formatted(dateFormatter)
+
+		let node = try! DocumentWithMultipleTypesOfIncludes.openAPINodeWithExample(using: encoder)
+
+		XCTAssertTrue(node.required)
+		XCTAssertEqual(node.jsonTypeFormat, .object(.generic))
+
+		guard case let .object(contextA, objectContext1) = node else {
+			XCTFail("Expected JSON Document to be an Object Node")
+			return
+		}
+
+		XCTAssertNotNil(contextA.example)
+		XCTAssertFalse(contextA.nullable)
+		XCTAssertEqual(contextA.format, .generic)
+		XCTAssertTrue(contextA.required)
+
+		XCTAssertEqual(objectContext1.minProperties, 2)
+		XCTAssertEqual(Set(objectContext1.requiredProperties), Set(["data", "included"]))
+		XCTAssertEqual(Set(objectContext1.properties.keys), Set(["data", "included"]))
+
+		guard case let .object(contextB, objectContext2)? = objectContext1.properties["data"] else {
+			XCTFail("Expected Data field of JSON Document to be an Object Node")
+			return
+		}
+
+		XCTAssertFalse(contextB.nullable)
+		XCTAssertEqual(contextB.format, .generic)
+		XCTAssertTrue(contextB.required)
+
+		XCTAssertEqual(objectContext2.minProperties, 3)
+		XCTAssertEqual(Set(objectContext2.requiredProperties), Set(["id", "attributes", "type"]))
+		XCTAssertEqual(Set(objectContext2.properties.keys), Set(["id", "attributes", "type"]))
+
+		XCTAssertEqual(objectContext2.properties["type"],
+					   JSONNode.string(.init(format: .generic,
+											 required: true,
+											 allowedValues: [.init("test")]),
+									   .init()))
+
+		guard case let .array(contextC, arrayContext)? = objectContext1.properties["included"] else {
+			XCTFail("Expected Includes field of JSON Document to be an Array Node")
+			return
+		}
+
+		XCTAssertFalse(contextC.nullable)
+		XCTAssertEqual(contextC.format, .generic)
+		XCTAssertTrue(contextC.required)
+
+		XCTAssertTrue(arrayContext.uniqueItems)
+		XCTAssertEqual(arrayContext.minItems, 0)
+
+		guard case let .one(of: includeNodes) = arrayContext.items else {
+			XCTFail("Expected Included to contain multiple types of items.")
+			return
+		}
+
+		XCTAssertEqual(includeNodes.count, 2)
+
+		guard case let .object(contextD, objectContext3) = includeNodes[0] else {
+			XCTFail("Expected Items of OneOf under Array under Data to be an Object Node")
+			return
+		}
+
+		XCTAssertFalse(contextD.nullable)
+		XCTAssertEqual(contextD.format, .generic)
+		XCTAssertTrue(contextD.required)
+
+		XCTAssertEqual(objectContext3.minProperties, 3)
+		XCTAssertEqual(Set(objectContext3.requiredProperties), Set(["id", "attributes", "type"]))
+		XCTAssertEqual(Set(objectContext3.properties.keys), Set(["id", "attributes", "type"]))
+
+		XCTAssertEqual(objectContext3.properties["type"],
+					   JSONNode.string(.init(format: .generic,
+											 required: true,
+											 allowedValues: [.init("test")]),
+									   .init()))
+
+		guard case let .object(contextE, objectContext4) = includeNodes[1] else {
+			XCTFail("Expected Items of OneOf under Array under Data to be an Object Node")
+			return
+		}
+
+		XCTAssertFalse(contextE.nullable)
+		XCTAssertEqual(contextE.format, .generic)
+		XCTAssertTrue(contextE.required)
+
+		XCTAssertEqual(objectContext4.minProperties, 2)
+		XCTAssertEqual(Set(objectContext4.requiredProperties), Set(["id", "type"]))
+		XCTAssertEqual(Set(objectContext4.properties.keys), Set(["id", "type"]))
+
+		XCTAssertEqual(objectContext4.properties["type"],
+					   JSONNode.string(.init(format: .generic,
+											 required: true,
+											 allowedValues: [.init("test2")]),
+									   .init()))
 	}
 }
 
@@ -49,6 +331,22 @@ extension JSONAPIDocumentOpenAPITests {
 	typealias TestEntity = BasicEntity<TestEntityDescription>
 
 	typealias SingleEntityDocument = Document<SingleResourceBody<TestEntity>, NoMetadata, NoLinks, NoIncludes, NoAPIDescription, UnknownJSONAPIError>
+
+	typealias ManyEntityDocument = Document<ManyResourceBody<TestEntity>, NoMetadata, NoLinks, NoIncludes, NoAPIDescription, UnknownJSONAPIError>
+
+	typealias DocumentWithIncludes = Document<SingleResourceBody<TestEntity>, NoMetadata, NoLinks, Include1<TestEntity>, NoAPIDescription, UnknownJSONAPIError>
+
+	enum TestEntityDescription2: EntityDescription {
+		static var jsonType: String { return "test2" }
+
+		typealias Attributes = NoAttributes
+
+		typealias Relationships = NoRelationships
+	}
+
+	typealias TestEntity2 = BasicEntity<TestEntityDescription2>
+
+	typealias DocumentWithMultipleTypesOfIncludes = Document<SingleResourceBody<TestEntity>, NoMetadata, NoLinks, Include2<TestEntity, TestEntity2>, NoAPIDescription, UnknownJSONAPIError>
 }
 
 extension Id: Sampleable where RawType == String {