Delete entity for dgraph of version v0.9.4

Users
1

I create entity:

import (
  dataBaseAPI "github.com/dgraph-io/dgraph/protos/api"
  dataBaseClient "github.com/dgraph-io/dgraph/client"
)

transaction := client.NewTxn() // *dataBaseClient.Dgraph

encodedCategory, err := json.Marshal(category)
if err != nil {
	log.Println(err)
	return category, ErrCategoryCantBeCreated
}

mutation := &dataBaseAPI.Mutation{
	SetJson:   encodedCategory,
	CommitNow: true,
}

assigned, err := transaction.Mutate(context.Background(), mutation)
category.ID = assigned.Uids["blank-0"]

How I can now delete that entity?

I try this:

transaction := client.NewTxn() // *dataBaseClient.Dgraph

encodedCategory, err := json.Marshal(category)
mutation := dataBaseAPI.Mutation{
	DeleteJson: encodedCategory,
	CommitNow:  true,
}

assigned, err := transaction.Mutate(context.Background(), &mutation)

and I get error:

“Transaction has been aborted. Please retry.”

In previous version i use:

request := dataBaseClient.Req{}
err = request.DeleteObject(&category)
_, err = client.Run(context.Background(), &request)
2

Hey @Vivat

We have an example for deleting a node here. Essentially, you just marshal the uid of the node to be deleted and send it using DeleteJson.

This message indicates that the related node or indexes were modified by some other transaction. This is a temporary error and we recommend that you retry the transaction when you get this error. You could also set IgnoreIndexConflict to be true while adding mutations which would reduce the probability of aborts.

3

Thanks, I tried marshal only uid and it work now.

Right:

type Category struct {
ID string json:"uid,omitempty"
}

DeleteCategory(category Category) (string, error) {
encodedCategory, err := json.Marshal(Category{ID: category.ID})
…

Not right:
DeleteCategory(category Category) (string, error) {
encodedCategory, err := json.Marshal(category)
…