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Update README.md to include an example for mutation without fields. #17

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Oct 15, 2021
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Update README.md to include an example for mutation without fields. #17

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49 changes: 49 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -282,6 +282,55 @@ fmt.Printf("Created a %v star review: %v\n", m.CreateReview.Stars, m.CreateRevie
// Created a 5 star review: This is a great movie!
```

#### Mutations Without Fields

Sometimes, you don't need any fields returned from a mutation. Doing that is easy.

For example, to make the following GraphQL mutation:

```GraphQL
mutation($ep: Episode!, $review: ReviewInput!) {
createReview(episode: $ep, review: $review)
}
variables {
"ep": "JEDI",
"review": {
"stars": 5,
"commentary": "This is a great movie!"
}
}
```

You can define:

```Go
var m struct {
CreateReview string `graphql:"createReview(episode: $ep, review: $review)"`
}
variables := map[string]interface{}{
"ep": starwars.Episode("JEDI"),
"review": starwars.ReviewInput{
Stars: graphql.Int(5),
Commentary: graphql.String("This is a great movie!"),
},
}
```

Then call `client.Mutate`:

```Go
err := client.Mutate(context.Background(), &m, variables)
if err != nil {
// Handle error.
}
fmt.Printf("Created a review: %s.\n", m.CreateReview)

// Output:
// Created a review: .
```



### Subscription

Usage
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