forked from Yamashou/gqlgenc
/
generater.go
76 lines (68 loc) · 2.01 KB
/
generater.go
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package generator
import (
"context"
"fmt"
"github.com/99designs/gqlgen/api"
codegenconfig "github.com/99designs/gqlgen/codegen/config"
"github.com/99designs/gqlgen/plugin"
"github.com/99designs/gqlgen/plugin/modelgen"
"github.com/sputnik-systems/gqlgenc/config"
)
// mutateHook adds the "omitempty" option to nilable fields.
// For more info see https://github.com/99designs/gqlgen/blob/master/docs/content/recipes/modelgen-hook.md
func mutateHook(cfg *config.Config) func(b *modelgen.ModelBuild) *modelgen.ModelBuild {
return func(build *modelgen.ModelBuild) *modelgen.ModelBuild {
for _, model := range build.Models {
if schemaModel, ok := cfg.GQLConfig.Schema.Types[model.Name]; ok && schemaModel.IsInputType() {
for _, field := range model.Fields {
// find field in graphql schema
for _, def := range schemaModel.Fields {
if def.Name == field.Name {
// only add 'omitempty' on optional field as defined in graphql schema
if !def.Type.NonNull {
field.Tag = `json:"` + field.Name + `,omitempty"`
}
break
}
}
}
} else {
for _, field := range model.Fields {
field.Tag = `json:"` + field.Name
if codegenconfig.IsNilable(field.Type) {
field.Tag += ",omitempty"
}
field.Tag += `"`
}
}
}
return build
}
}
func Generate(ctx context.Context, cfg *config.Config, option ...api.Option) error {
var plugins []plugin.Plugin
if cfg.Model.IsDefined() {
p := modelgen.Plugin{
MutateHook: mutateHook(cfg),
}
plugins = append(plugins, &p)
}
for _, o := range option {
o(cfg.GQLConfig, &plugins)
}
if err := cfg.LoadSchema(ctx); err != nil {
return fmt.Errorf("failed to load schema: %w", err)
}
if err := cfg.GQLConfig.Init(); err != nil {
return fmt.Errorf("generating core failed: %w", err)
}
for _, p := range plugins {
if mut, ok := p.(plugin.ConfigMutator); ok {
err := mut.MutateConfig(cfg.GQLConfig)
if err != nil {
return fmt.Errorf("%s failed: %w", p.Name(), err)
}
}
}
return nil
}