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Merge pull request #574 from graphql-go/examples-todo-schema
examples/todo: extracts TodoSchema
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,183 @@ | ||
| package schema | ||
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| import ( | ||
| "math/rand" | ||
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| "github.com/graphql-go/graphql" | ||
| ) | ||
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| var TodoList []Todo | ||
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| type Todo struct { | ||
| ID string `json:"id"` | ||
| Text string `json:"text"` | ||
| Done bool `json:"done"` | ||
| } | ||
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| var letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ") | ||
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| func RandStringRunes(n int) string { | ||
| b := make([]rune, n) | ||
| for i := range b { | ||
| b[i] = letterRunes[rand.Intn(len(letterRunes))] | ||
| } | ||
| return string(b) | ||
| } | ||
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| // define custom GraphQL ObjectType `todoType` for our Golang struct `Todo` | ||
| // Note that | ||
| // - the fields in our todoType maps with the json tags for the fields in our struct | ||
| // - the field type matches the field type in our struct | ||
| var todoType = graphql.NewObject(graphql.ObjectConfig{ | ||
| Name: "Todo", | ||
| Fields: graphql.Fields{ | ||
| "id": &graphql.Field{ | ||
| Type: graphql.String, | ||
| }, | ||
| "text": &graphql.Field{ | ||
| Type: graphql.String, | ||
| }, | ||
| "done": &graphql.Field{ | ||
| Type: graphql.Boolean, | ||
| }, | ||
| }, | ||
| }) | ||
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| // root mutation | ||
| var rootMutation = graphql.NewObject(graphql.ObjectConfig{ | ||
| Name: "RootMutation", | ||
| Fields: graphql.Fields{ | ||
| /* | ||
| curl -g 'http://localhost:8080/graphql?query=mutation+_{createTodo(text:"My+new+todo"){id,text,done}}' | ||
| */ | ||
| "createTodo": &graphql.Field{ | ||
| Type: todoType, // the return type for this field | ||
| Description: "Create new todo", | ||
| Args: graphql.FieldConfigArgument{ | ||
| "text": &graphql.ArgumentConfig{ | ||
| Type: graphql.NewNonNull(graphql.String), | ||
| }, | ||
| }, | ||
| Resolve: func(params graphql.ResolveParams) (interface{}, error) { | ||
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| // marshall and cast the argument value | ||
| text, _ := params.Args["text"].(string) | ||
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| // figure out new id | ||
| newID := RandStringRunes(8) | ||
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| // perform mutation operation here | ||
| // for e.g. create a Todo and save to DB. | ||
| newTodo := Todo{ | ||
| ID: newID, | ||
| Text: text, | ||
| Done: false, | ||
| } | ||
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| TodoList = append(TodoList, newTodo) | ||
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| // return the new Todo object that we supposedly save to DB | ||
| // Note here that | ||
| // - we are returning a `Todo` struct instance here | ||
| // - we previously specified the return Type to be `todoType` | ||
| // - `Todo` struct maps to `todoType`, as defined in `todoType` ObjectConfig` | ||
| return newTodo, nil | ||
| }, | ||
| }, | ||
| /* | ||
| curl -g 'http://localhost:8080/graphql?query=mutation+_{updateTodo(id:"a",done:true){id,text,done}}' | ||
| */ | ||
| "updateTodo": &graphql.Field{ | ||
| Type: todoType, // the return type for this field | ||
| Description: "Update existing todo, mark it done or not done", | ||
| Args: graphql.FieldConfigArgument{ | ||
| "done": &graphql.ArgumentConfig{ | ||
| Type: graphql.Boolean, | ||
| }, | ||
| "id": &graphql.ArgumentConfig{ | ||
| Type: graphql.NewNonNull(graphql.String), | ||
| }, | ||
| }, | ||
| Resolve: func(params graphql.ResolveParams) (interface{}, error) { | ||
| // marshall and cast the argument value | ||
| done, _ := params.Args["done"].(bool) | ||
| id, _ := params.Args["id"].(string) | ||
| affectedTodo := Todo{} | ||
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| // Search list for todo with id and change the done variable | ||
| for i := 0; i < len(TodoList); i++ { | ||
| if TodoList[i].ID == id { | ||
| TodoList[i].Done = done | ||
| // Assign updated todo so we can return it | ||
| affectedTodo = TodoList[i] | ||
| break | ||
| } | ||
| } | ||
| // Return affected todo | ||
| return affectedTodo, nil | ||
| }, | ||
| }, | ||
| }, | ||
| }) | ||
|
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| // root query | ||
| // we just define a trivial example here, since root query is required. | ||
| // Test with curl | ||
| // curl -g 'http://localhost:8080/graphql?query={lastTodo{id,text,done}}' | ||
| var rootQuery = graphql.NewObject(graphql.ObjectConfig{ | ||
| Name: "RootQuery", | ||
| Fields: graphql.Fields{ | ||
|
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| /* | ||
| curl -g 'http://localhost:8080/graphql?query={todo(id:"b"){id,text,done}}' | ||
| */ | ||
| "todo": &graphql.Field{ | ||
| Type: todoType, | ||
| Description: "Get single todo", | ||
| Args: graphql.FieldConfigArgument{ | ||
| "id": &graphql.ArgumentConfig{ | ||
| Type: graphql.String, | ||
| }, | ||
| }, | ||
| Resolve: func(params graphql.ResolveParams) (interface{}, error) { | ||
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| idQuery, isOK := params.Args["id"].(string) | ||
| if isOK { | ||
| // Search for el with id | ||
| for _, todo := range TodoList { | ||
| if todo.ID == idQuery { | ||
| return todo, nil | ||
| } | ||
| } | ||
| } | ||
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| return Todo{}, nil | ||
| }, | ||
| }, | ||
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| "lastTodo": &graphql.Field{ | ||
| Type: todoType, | ||
| Description: "Last todo added", | ||
| Resolve: func(params graphql.ResolveParams) (interface{}, error) { | ||
| return TodoList[len(TodoList)-1], nil | ||
| }, | ||
| }, | ||
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| /* | ||
| curl -g 'http://localhost:8080/graphql?query={todoList{id,text,done}}' | ||
| */ | ||
| "todoList": &graphql.Field{ | ||
| Type: graphql.NewList(todoType), | ||
| Description: "List of todos", | ||
| Resolve: func(p graphql.ResolveParams) (interface{}, error) { | ||
| return TodoList, nil | ||
| }, | ||
| }, | ||
| }, | ||
| }) | ||
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| // define schema, with our rootQuery and rootMutation | ||
| var TodoSchema, _ = graphql.NewSchema(graphql.SchemaConfig{ | ||
| Query: rootQuery, | ||
| Mutation: rootMutation, | ||
| }) |