entgql: add annotation Deprecated for deprecated field (#595)

Author: luantranminh

Diff for: entgql/extension.go

@@ -18,6 +18,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"slices"
 
 	"entgo.io/ent/entc"
 	"entgo.io/ent/entc/gen"
@@ -244,7 +245,23 @@ func (e *Extension) genSchemaHook() gen.Hook {
 			if err = next.Generate(g); err != nil {
 				return err
 			}
-
+			for _, t := range g.Nodes {
+				for _, f := range t.DeprecatedFields() {
+					ant, err := annotation(f.Annotations)
+					if err != nil {
+						return err
+					}
+					if !slices.ContainsFunc(ant.Directives, func(d Directive) bool {
+						return d.Name == "deprecated"
+					}) {
+						ant.Directives = append(ant.Directives, Deprecated(f.DeprecationReason()))
+						if f.Annotations == nil {
+							f.Annotations = make(map[string]interface{})
+						}
+						f.Annotations[ant.Name()] = ant
+					}
+				}
+			}
 			if !(e.genSchema || e.genWhereInput || e.genMutations) {
 				return nil
 			}

Diff for: entgql/internal/todo/ent.graphql

@@ -77,7 +77,7 @@ type Category implements Node {
   types: CategoryTypes
   duration: Duration
   count: Uint64
-  strings: [String!]
+  strings: [String!] @deprecated(reason: "use `string` instead")
   todos(
     """
     Returns the elements in the list that come after the specified cursor.

Diff for: entgql/internal/todo/ent/category.go

@@ -76,7 +76,8 @@ func (Category) Fields() []ent.Field {
 				entgql.Type("Uint64"),
 			),
 		field.Strings("strings").
-			Optional(),
+			Optional().
+			Deprecated("use `string` instead"),
 	}
 }
 

Diff for: entgql/internal/todo/ent/category/category.go

@@ -0,0 +1,54 @@
+// Copyright 2019-present Facebook
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package todo_test
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"entgo.io/contrib/entgql"
+	"entgo.io/ent/entc"
+	"entgo.io/ent/entc/gen"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGeneratedSchema(t *testing.T) {
+	tempDir := t.TempDir()
+	gqlcfg, err := os.ReadFile("./gqlgen.yml")
+	require.NoError(t, err)
+	err = os.WriteFile(filepath.Join(tempDir, "gqlgen.yml"), gqlcfg, 0644)
+	require.NoError(t, err)
+	ex, err := entgql.NewExtension(
+		entgql.WithConfigPath(filepath.Join(tempDir, "gqlgen.yml")),
+		entgql.WithSchemaGenerator(),
+		entgql.WithSchemaPath(filepath.Join(tempDir, "ent.graphql")),
+		entgql.WithWhereInputs(true),
+		entgql.WithNodeDescriptor(true),
+	)
+	require.NoError(t, err)
+	err = entc.Generate("./ent/schema", &gen.Config{
+		Target: tempDir,
+		Features: []gen.Feature{
+			gen.FeatureModifier,
+		},
+	}, entc.Extensions(ex))
+	require.NoError(t, err)
+	expected, err := os.ReadFile("./ent.graphql")
+	require.NoError(t, err)
+	actual, err := os.ReadFile(filepath.Join(tempDir, "ent.graphql"))
+	require.NoError(t, err)
+	require.Equal(t, string(expected), string(actual))
+}