add graphql example

#2029

_examples/graphql/schema-first/graph/model/models_gen.go

@@ -0,0 +1,66 @@
+// Code generated by github.com/99designs/gqlgen, DO NOT EDIT.
+
+package model
+
+import (
+	"fmt"
+	"io"
+	"strconv"
+)
+
+type Character struct {
+	ID         string     `json:"id"`
+	Name       string     `json:"name"`
+	IsHero     bool       `json:"isHero"`
+	CliqueType CliqueType `json:"cliqueType"`
+}
+
+type CharacterInput struct {
+	Name       string     `json:"name"`
+	ID         *string    `json:"id"`
+	IsHero     *bool      `json:"isHero"`
+	CliqueType CliqueType `json:"cliqueType"`
+}
+
+type CliqueType string
+
+const (
+	// People who are elite with parents having money
+	CliqueTypeKooks CliqueType = "KOOKS"
+	// People who desperate to move up the social ladder to become new versions of themselves and establish new beginnings
+	CliqueTypePogues CliqueType = "POGUES"
+)
+
+var AllCliqueType = []CliqueType{
+	CliqueTypeKooks,
+	CliqueTypePogues,
+}
+
+func (e CliqueType) IsValid() bool {
+	switch e {
+	case CliqueTypeKooks, CliqueTypePogues:
+		return true
+	}
+	return false
+}
+
+func (e CliqueType) String() string {
+	return string(e)
+}
+
+func (e *CliqueType) UnmarshalGQL(v interface{}) error {
+	str, ok := v.(string)
+	if !ok {
+		return fmt.Errorf("enums must be strings")
+	}
+
+	*e = CliqueType(str)
+	if !e.IsValid() {
+		return fmt.Errorf("%s is not a valid CliqueType", str)
+	}
+	return nil
+}
+
+func (e CliqueType) MarshalGQL(w io.Writer) {
+	fmt.Fprint(w, strconv.Quote(e.String()))
+}