schema/field: store reflect type info in json fields

schema/field/field.go

@@ -72,20 +72,21 @@ func Time(name string) *timeBuilder {
 //
 func JSON(name string, typ interface{}) *jsonBuilder {
 	t := reflect.TypeOf(typ)
-	info := &TypeInfo{
-		Type:    TypeJSON,
-		Ident:   t.String(),
-		PkgPath: t.PkgPath(),
-	}
+	b := &jsonBuilder{&Descriptor{
+		Name: name,
+		Info: &TypeInfo{
+			Type:    TypeJSON,
+			Ident:   t.String(),
+			PkgPath: t.PkgPath(),
+		},
+	}}
+	b.desc.goType(typ, t)
 	switch t.Kind() {
 	case reflect.Slice, reflect.Array, reflect.Ptr, reflect.Map:
-		info.Nillable = true
-		info.PkgPath = pkgPath(t)
+		b.desc.Info.Nillable = true
+		b.desc.Info.PkgPath = pkgPath(t)
 	}
-	return &jsonBuilder{&Descriptor{
-		Name: name,
-		Info: info,
-	}}
+	return b
 }
 
 // Strings returns a new JSON Field with type []string.

schema/field/field_test.go

@@ -427,6 +427,18 @@ func TestJSON(t *testing.T) {
 	assert.Equal(t, field.TypeJSON, fd.Info.Type)
 	assert.Equal(t, "map[string]string", fd.Info.String())
 	assert.Equal(t, "comment", fd.Comment)
+	assert.True(t, fd.Info.Nillable)
+	assert.False(t, fd.Info.RType.IsPtr())
+
+	type T struct{ S string }
+	fd = field.JSON("name", &T{}).
+		Descriptor()
+	assert.True(t, fd.Info.Nillable)
+	assert.Equal(t, "*field_test.T", fd.Info.Ident)
+	assert.Equal(t, "entgo.io/ent/schema/field_test", fd.Info.PkgPath)
+	assert.True(t, fd.Info.RType.IsPtr())
+	assert.Equal(t, "T", fd.Info.RType.Name)
+	assert.Equal(t, "entgo.io/ent/schema/field_test", fd.Info.RType.PkgPath)
 
 	fd = field.JSON("dir", http.Dir("dir")).
 		Optional().
@@ -436,6 +448,7 @@ func TestJSON(t *testing.T) {
 	assert.Equal(t, "dir", fd.Name)
 	assert.Equal(t, "net/http", fd.Info.PkgPath)
 	assert.Equal(t, "http.Dir", fd.Info.String())
+	assert.False(t, fd.Info.Nillable)
 
 	fd = field.Strings("strings").
 		Optional().