Fix default values encoding.

Author: paulofaria

Sources/GraphQL/Execution/Execute.swift

@@ -285,7 +285,7 @@ func execute(
             exeContext: buildContext,
             operation: buildContext.operation,
             rootValue: rootValue
-            ).flatMapThrowing { data -> GraphQLResult in
+        ).flatMapThrowing { data -> GraphQLResult in
             var dataMap: Map = [:]
 
             for (key, value) in data {

Sources/GraphQL/Execution/Values.swift

@@ -42,7 +42,7 @@ func getArgumentValues(argDefs: [GraphQLArgumentDefinition], argASTs: [Argument]
         )
 
         if value == nil {
-            value = argDef.defaultValue
+            value = argDef.defaultValue.map({ .string($0) })
         }
 
         if let value = value {
@@ -150,7 +150,7 @@ func coerceValue(type: GraphQLInputType, value: Map) throws -> Map? {
             var fieldValue = try coerceValue(type: field!.type, value: value[fieldName] ?? .null)
 
             if fieldValue == .null {
-                fieldValue = field?.defaultValue
+                fieldValue = field.flatMap({ $0.defaultValue.map({ .string($0) }) })
             } else {
                 objCopy[fieldName] = fieldValue
             }

Sources/GraphQL/Type/Definition.swift

@@ -1,3 +1,4 @@
+import Foundation
 import NIO
 
 /**
@@ -666,7 +667,7 @@ public struct GraphQLArgument {
 public struct GraphQLArgumentDefinition {
     public let name: String
     public let type: GraphQLInputType
-    public let defaultValue: Map?
+    public let defaultValue: String?
     public let description: String?
 
     init(
@@ -677,7 +678,14 @@ public struct GraphQLArgumentDefinition {
     ) {
         self.name = name
         self.type = type
-        self.defaultValue = defaultValue
+        
+        self.defaultValue = try? defaultValue.flatMap {
+            String(
+                data: try JSONEncoder().encode($0),
+                encoding: .utf8
+            )
+        }
+        
         self.description = description
     }
 }
@@ -1253,12 +1261,19 @@ func defineInputObjectFieldMap(
 
 public struct InputObjectField {
     public let type: GraphQLInputType
-    public let defaultValue: Map?
+    public let defaultValue: String?
     public let description: String?
 
     public init(type: GraphQLInputType, defaultValue: Map? = nil, description: String? = nil) {
         self.type = type
-        self.defaultValue = defaultValue
+        
+        self.defaultValue = try? defaultValue.flatMap {
+            String(
+                data: try JSONEncoder().encode($0),
+                encoding: .utf8
+            )
+        }
+        
         self.description = description
     }
 }
@@ -1269,7 +1284,7 @@ public struct InputObjectFieldDefinition {
     public let name: String
     public let description: String?
     public let type: GraphQLInputType
-    public let defaultValue: Map?
+    public let defaultValue: String?
 }
 
 extension InputObjectFieldDefinition : Encodable {

Sources/GraphQL/Type/Introspection.swift

@@ -360,7 +360,7 @@ let __InputValue = try! GraphQLObjectType(
                     return nil
                 }
 
-                return defaultValue
+                return .string(defaultValue)
             }
         )
     ]

Sources/GraphQL/Utilities/ValueFromAST.swift

@@ -75,7 +75,7 @@ func valueFromAST(valueAST: Value?, type: GraphQLInputType, variables: [String:
             )
 
             if fieldValue == .null {
-                fieldValue = field?.defaultValue
+                fieldValue = field.flatMap({ $0.defaultValue.map({ .string($0) }) })
             } else {
                 obj[fieldName] = fieldValue
             }