fix: issue #65: Deprecate Params.RootValue in favor of a Params.Root …

…that is an interface{}

examples/modify-context/main.go

@@ -64,7 +64,7 @@ func main() {
 	result := graphql.Do(graphql.Params{
 		Context:       ctx,
 		RequestString: "{ users { id } }",
-		RootObject:    rootObject,
+		Root:          rootObject,
 		Schema:        schema,
 	})
 	b, err := json.Marshal(result)

executor_resolve_test.go

@@ -37,7 +37,7 @@ func TestExecutesResolveFunction_DefaultFunctionAccessesProperties(t *testing.T)
 	result := graphql.Do(graphql.Params{
 		Schema:        schema,
 		RequestString: `{ test }`,
-		RootObject:    source,
+		Root:          source,
 	})
 	if !reflect.DeepEqual(expected, result.Data) {
 		t.Fatalf("Unexpected result, Diff: %v", testutil.Diff(expected, result.Data))
@@ -60,7 +60,7 @@ func TestExecutesResolveFunction_DefaultFunctionCallsMethods(t *testing.T) {
 	result := graphql.Do(graphql.Params{
 		Schema:        schema,
 		RequestString: `{ test }`,
-		RootObject:    source,
+		Root:          source,
 	})
 	if !reflect.DeepEqual(expected, result.Data) {
 		t.Fatalf("Unexpected result, Diff: %v", testutil.Diff(expected, result.Data))

graphql.go

@@ -17,8 +17,14 @@ type Params struct {
 
 	// The value provided as the first argument to resolver functions on the top
 	// level type (e.g. the query object type).
+	//
+	// Deprecated: use the Root field instead.
 	RootObject map[string]interface{}
 
+	// The value provided as the first argument to resolver functions on the top
+	// level type (e.g. the query object type).
+	Root interface{}
+
 	// A mapping of variable name to runtime value to use for all variables
 	// defined in the requestString.
 	VariableValues map[string]interface{}
@@ -105,9 +111,14 @@ func Do(p Params) *Result {
 		}
 	}
 
+	root := p.Root
+	if root == nil {
+		root = p.RootObject
+	}
+
 	return Execute(ExecuteParams{
 		Schema:        p.Schema,
-		Root:          p.RootObject,
+		Root:          root,
 		AST:           AST,
 		OperationName: p.OperationName,
 		Args:          p.VariableValues,