add array input example. close graph-gophers#489 (graph-gophers#536)

add an array input example

example/array_as_argument/server.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"log"
+	"net/http"
+
+	"github.com/graph-gophers/graphql-go"
+	"github.com/graph-gophers/graphql-go/relay"
+)
+
+type query struct{}
+
+type IntInput struct {
+	A int32
+	B int32
+}
+
+func (_ *query) Reversed(args struct{ Values []string }) []string {
+	result := make([]string, len(args.Values))
+
+	for i, value := range args.Values {
+		for _, v := range value {
+			result[i] = string(v) + result[i]
+		}
+	}
+	return result
+}
+
+func (_ *query) Sums(args struct{ Values []IntInput }) []int32 {
+	result := make([]int32, len(args.Values))
+
+	for i, value := range args.Values {
+		result[i] = value.A + value.B
+	}
+	return result
+}
+
+func main() {
+	s := `
+		input IntInput {
+			a: Int!
+			b: Int!
+		}
+
+		type Query {
+			reversed(values: [String!]!): [String!]!
+			sums(values: [IntInput!]!): [Int!]!
+		}
+	`
+	schema := graphql.MustParseSchema(s, &query{})
+	http.Handle("/query", &relay.Handler{Schema: schema})
+
+	log.Println("Listen in port :8080")
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}
+
+/*
+	* The following query
+
+	query{
+		reversed(values:["hello", "hi"])
+		sums(values:[{a:2,b:3},{a:-10,b:-1}])
+	}
+
+	* will return
+
+	{
+		"data": {
+			"reversed": [
+				"olleh",
+				"ih"
+			],
+			"sums": [
+				5,
+				-11
+			]
+		}
+	}
+*/