entc/gen: reject fields without name (#273)

Fixes #272

entc/gen/type.go

@@ -141,6 +141,8 @@ func NewType(c *Config, schema *load.Schema) (*Type, error) {
 	}
 	for _, f := range schema.Fields {
 		switch {
+		case f.Name == "":
+			return nil, fmt.Errorf("field name cannot be empty")
 		case f.Info == nil || !f.Info.Valid():
 			return nil, fmt.Errorf("invalid type for field %s", f.Name)
 		case f.Nillable && !f.Optional:

entc/gen/type_test.go

@@ -61,6 +61,14 @@ func TestType(t *testing.T) {
 		},
 	})
 	require.Error(err, "empty value for enums")
+
+	_, err = NewType(&Config{Package: "entc/gen"}, &load.Schema{
+		Name: "T",
+		Fields: []*load.Field{
+			{Name: "", Info: &field.TypeInfo{Type: field.TypeInt}},
+		},
+	})
+	require.Error(err, "empty field name")
 }
 
 func TestType_Label(t *testing.T) {