Pagination is a common requirement when dealing with large sets of data in GraphQL. With the graphql-go library, you can implement pagination in a structured way. The most common techniques for pagination include cursor-based and offset-based pagination. Below, I'll explain both methods and provide an example to demonstrate how to paginate results using graphql-go.
// Sample Go code demonstrating pagination with graphql-go
package main
import (
"context"
"fmt"
"github.com/graphql-go/graphql"
"net/http"
"github.com/graphql-go/handler"
)
type Item struct {
ID int `json:"id"`
Name string `json:"name"`
Description string `json:"description"`
}
var items []Item
func init() {
for i := 1; i <= 100; i++ {
items = append(items, Item{ID: i, Name: fmt.Sprintf("Item %d", i), Description: fmt.Sprintf("Description for Item %d", i)})
}
}
func getPaginatedItems(offset int, limit int) []Item {
start := offset
end := offset + limit
if start >= len(items) {
return []Item{}
}
if end > len(items) {
end = len(items)
}
return items[start:end]
}
func main() {
itemType := graphql.NewObject(graphql.ObjectConfig{
Name: "Item",
Fields: graphql.Fields{
"id": &graphql.Field{Type: graphql.Int},
"name": &graphql.Field{Type: graphql.String},
"description": &graphql.Field{Type: graphql.String},
},
})
queryType := graphql.NewObject(graphql.ObjectConfig{
Name: "Query",
Fields: graphql.Fields{
"items": &graphql.Field{
Type: graphql.NewList(itemType),
Args: graphql.FieldConfigArgument{
"offset": &graphql.ArgumentConfig{
Type: graphql.Int,
},
"limit": &graphql.ArgumentConfig{
Type: graphql.Int,
},
},
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
offset, _ := p.Args["offset"].(int)
limit, _ := p.Args["limit"].(int)
return getPaginatedItems(offset, limit), nil
},
},
},
})
schema, _ := graphql.NewSchema(graphql.SchemaConfig{
Query: queryType,
})
h := handler.New(&handler.Config{
Schema: &schema,
GraphiQL: true,
})
http.Handle("/graphql", h)
http.ListenAndServe(":8080", nil)
}
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