schema/field: support for sensitive json fields (#2701)

Closed https://github.com/ent/ent/issues/2596

schema/field/field.go

@@ -716,6 +716,12 @@ func (b *jsonBuilder) Comment(c string) *jsonBuilder {
 	return b
 }
 
+// Sensitive fields not printable and not serializable.
+func (b *jsonBuilder) Sensitive() *jsonBuilder {
+	b.desc.Sensitive = true
+	return b
+}
+
 // StructTag sets the struct tag of the field.
 func (b *jsonBuilder) StructTag(s string) *jsonBuilder {
 	b.desc.Tag = s

schema/field/field_test.go

@@ -474,9 +474,11 @@ func TestJSON(t *testing.T) {
 	fd = field.Strings("strings").
 		Optional().
 		Default([]string{"a", "b"}).
+		Sensitive().
 		Descriptor()
 	assert.NoError(t, fd.Err)
 	assert.True(t, fd.Optional)
+	assert.True(t, fd.Sensitive)
 	assert.Empty(t, fd.Info.PkgPath)
 	assert.Equal(t, "strings", fd.Name)
 	assert.Equal(t, []string{"a", "b"}, fd.Default)