| // Licensed to Apache Software Foundation (ASF) under one or more contributor |
| // license agreements. See the NOTICE file distributed with |
| // this work for additional information regarding copyright |
| // ownership. Apache Software Foundation (ASF) licenses this file to you 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 main |
| |
| import ( |
| "fmt" |
| "github.com/99designs/gqlgen/api" |
| "github.com/99designs/gqlgen/codegen/config" |
| "github.com/99designs/gqlgen/plugin/modelgen" |
| "go/types" |
| "os" |
| "strings" |
| ) |
| |
| func addingOmitemptyToTag(tag string) string { |
| jsonPrefix := strings.Index(tag, "json:\"") |
| if jsonPrefix < 0 { |
| return tag + "json:\",omitempty\"" |
| } |
| endInx := strings.Index(tag[jsonPrefix+6:], "\"") |
| jsonTag := "json:\"" + tag[jsonPrefix+6:endInx+6] + ",omitempty\"" |
| return jsonTag + tag[endInx+7:] |
| } |
| |
| // Defining mutation function |
| func mutateHook(b *modelgen.ModelBuild) *modelgen.ModelBuild { |
| for _, model := range b.Models { |
| for _, field := range model.Fields { |
| switch field.Type.(type) { |
| case *types.Pointer: |
| field.Tag = addingOmitemptyToTag(field.Tag) |
| } |
| } |
| } |
| |
| return b |
| } |
| |
| func main() { |
| cfg, err := config.LoadConfigFromDefaultLocations() |
| if err != nil { |
| fmt.Fprintln(os.Stderr, "failed to load config", err.Error()) |
| os.Exit(2) |
| } |
| |
| // Attaching the mutation function onto modelgen plugin |
| p := modelgen.Plugin{ |
| MutateHook: mutateHook, |
| } |
| |
| err = api.Generate(cfg, api.ReplacePlugin(&p)) |
| |
| if err != nil { |
| fmt.Fprintln(os.Stderr, err.Error()) |
| os.Exit(3) |
| } |
| } |