README
¶
REST Layer MongoDB Backend
This REST Layer resource storage backend stores data in a MongoDB cluster using mgo.
Usage
import "github.com/rs/rest-layer-mongo"
Create a mgo master session:
session, err := mgo.Dial(url)
Create a resource storage handler with a given DB/collection:
s := mongo.NewHandler(session, "the_db", "the_collection")
Use this handler with a resource:
index.Bind("foo", foo, s, resource.DefaultConf)
You may want to create a many mongo handlers as you have resources as long as you want each resources in a different collection. You can share the same mgo session across all you handlers.
Object ID
This package also provides a REST Layer schema.Validator for MongoDB ObjectIDs. This validator ensures proper binary serialization of the Object ID in the database for space efficiency.
You may reference this validator using mongo.ObjectID as schema.Field.
A mongo.NewObjectID field hook and mongo.ObjectIDField helper are also provided.
Documentation
¶
Overview ¶
Package mongo is a REST Layer resource storage handler for MongoDB using mgo
Example ¶
package main
import (
"log"
"net/http"
"github.com/rs/cors"
"github.com/rs/rest-layer/resource"
"github.com/rs/rest-layer/rest"
"github.com/rs/rest-layer/schema"
mgo "gopkg.in/mgo.v2"
mongo "github.com/rs/rest-layer-mongo"
)
var (
user = schema.Schema{
Fields: schema.Fields{
"id": schema.IDField,
"created": schema.CreatedField,
"updated": schema.UpdatedField,
"name": {
Required: true,
Filterable: true,
Sortable: true,
Validator: &schema.String{
MaxLen: 150,
},
},
},
}
// Define a post resource schema
post = schema.Schema{
Fields: schema.Fields{
"id": schema.IDField,
"created": schema.CreatedField,
"updated": schema.UpdatedField,
"user": {
Required: true,
Filterable: true,
Validator: &schema.Reference{
Path: "users",
},
},
"public": {
Filterable: true,
Validator: &schema.Bool{},
},
"meta": {
Schema: &schema.Schema{
Fields: schema.Fields{
"title": {
Required: true,
Validator: &schema.String{
MaxLen: 150,
},
},
"body": {
Validator: &schema.String{
MaxLen: 100000,
},
},
},
},
},
},
}
)
func main() {
session, err := mgo.Dial("")
if err != nil {
log.Fatalf("Can't connect to MongoDB: %s", err)
}
db := "test_rest_layer"
index := resource.NewIndex()
users := index.Bind("users", user, mongo.NewHandler(session, db, "users"), resource.Conf{
AllowedModes: resource.ReadWrite,
})
users.Bind("posts", "user", post, mongo.NewHandler(session, db, "posts"), resource.Conf{
AllowedModes: resource.ReadWrite,
})
api, err := rest.NewHandler(index)
if err != nil {
log.Fatalf("Invalid API configuration: %s", err)
}
http.Handle("/", cors.New(cors.Options{OptionsPassthrough: true}).Handler(api))
log.Print("Serving API on http://localhost:8080")
if err := http.ListenAndServe(":8080", nil); err != nil {
log.Fatal(err)
}
}
Output:
Index ¶
- Variables
- type Handler
- func (m Handler) Clear(ctx context.Context, q *query.Query) (int, error)
- func (m Handler) Count(ctx context.Context, query *query.Query) (int, error)
- func (m Handler) Delete(ctx context.Context, item *resource.Item) error
- func (m Handler) Find(ctx context.Context, q *query.Query) (*resource.ItemList, error)
- func (m Handler) Insert(ctx context.Context, items []*resource.Item) error
- func (m Handler) Update(ctx context.Context, item *resource.Item, original *resource.Item) error
- type ObjectID
Examples ¶
Constants ¶
This section is empty.
Variables ¶
var ( // NewObjectID is a field hook handler that generates a new Mongo ObjectID hex if // value is nil to be used in schema with OnInit. NewObjectID = func(ctx context.Context, value interface{}) interface{} { if value == nil { value = bson.NewObjectId().Hex() } return value } // ObjectIDField is a common schema field configuration that generate an Object ID // for new item id. ObjectIDField = schema.Field{ Required: true, ReadOnly: true, OnInit: NewObjectID, Filterable: true, Sortable: true, Validator: &ObjectID{}, } )
Functions ¶
This section is empty.
Types ¶
type Handler ¶
Handler handles resource storage in a MongoDB collection.
func NewHandler ¶
NewHandler creates an new mongo handler
func (Handler) Clear ¶
Clear clears all items from the mongo collection matching the query. Note that when q.Window != nil, the current implementation may error if the BSON encoding of all matching IDs according to the q.Window length gets close to the maximum document size in MongDB (usually 16MiB): https://docs.mongodb.com/manual/reference/limits/#bson-documents
Source Files