ent/entc/gen/template/meta.tmpl

{{ define "meta" }}

{{- with extend $ "Package" $.Package -}}
	{{ template "header" . }}
{{ end }}

{{ template "import" $ }}

const (
	// Label holds the string label denoting the {{ lower $.Name }} type in the database.
	Label = "{{ $.Label }}"
	// {{ $.ID.Constant }} holds the string denoting the id field in the database.
	{{ $.ID.Constant }} = "{{ snake $.ID.Name }}"
	{{ range $_, $f := $.Fields -}}{{ $field := $f.Constant -}}
		// {{ $field }} holds the string denoting the {{ lower $f.Name }} vertex property in the database.
		{{ $field }} = "{{ snake $f.Name }}"
	{{ end -}}
	{{ range $_, $storage := $.Storage }}
		{{ $tmpl := printf "dialect/%s/meta/constants" $storage }}
		{{ xtemplate $tmpl $ }}
	{{ end }}
)

{{ range $_, $storage := $.Storage }}
	{{ $tmpl := printf "dialect/%s/meta/variables" $storage }}
	{{ if hasTemplate $tmpl }}
		{{ xtemplate $tmpl $ }}
	{{ end }}
{{ end }}

{{ if or $.HasDefault $.HasValidators }}
var (
	fields = {{ base $.Schema }}.{{ $.Name }}{}.Fields()
	{{ range $i, $f := $.Fields -}}
		{{ if $f.HasDefault }}
			{{- $default := $f.DefaultConstant -}}
			// {{ $default }} holds the default value for the {{ $f.Name }} field.
			{{ $default }} = fields[{{ $i }}].Value().({{ $f.Type }})
		{{ end -}}
		{{ with $f.Validators -}}
			{{ $name := $f.Validator -}}
			{{ $type :=  printf "func (%s) error" $f.Type -}}
			// {{ $name }} is a validator for the "{{ $f.Name }}" field. It is called by the builders before save.
			{{ if eq $f.Validators 1 -}}
				{{ $name }} = fields[{{ $i }}].Validators()[0].({{ $type }})
			{{ else -}}
				{{ $name }} = func() {{ $type }} {
					validators := fields[{{ $i }}].Validators()
					fns := [...]func({{ $f.Type }}) error {
						{{- range $j, $n := xrange $f.Validators }}
							validators[{{ $j }}].(func({{ $f.Type }}) error),
						{{- end }}
					}
					return func({{ $f.Name }} {{ $f.Type }}) error {
						for _, fn := range fns {
							if err := fn({{ $f.Name }}); err != nil {
								return err
							}
						}
						return nil
					}
				}()
			{{ end -}}
		{{ end -}}
	{{ end -}}
)
{{ end }}

{{ end }}