I built a simple GraphQL API extremely similar to gqlgen's "Getting Started" tutorial. I can query it successfully with curl. But I can't get the curl request for mutation right.
schema.graphql:
type Screenshot {
id: ID!
url: String!
filename: String!
username: String!
description: String
}
input NewScreenshot {
id: ID!
url: String!
filename: String!
username: String!
description: String
}
type Mutation {
createScreenshot(input: NewScreenshot!): Screenshot!
deleteScreenshot(id: ID!): String!
}
type Query {
screenShots(username: String!): [Screenshot!]!
}
models_gen.go:
type NewScreenshot struct {
ID string `json:"id"`
URL string `json:"url"`
Filename string `json:"filename"`
Username string `json:"username"`
Description *string `json:"description"`
}
type Screenshot struct {
ID string `json:"id"`
URL string `json:"url"`
Filename string `json:"filename"`
Username string `json:"username"`
Description *string `json:"description"`
}
resolver.go:
func (r *mutationResolver) CreateScreenshot(ctx context.Context, input NewScreenshot) (Screenshot, error) {
id, err := uuid.NewV4()
shot := Screenshot{
ID: id.String(),
Description: input.Description,
URL: input.URL,
Filename: input.Filename,
Username: input.Username,
}
return shot, nil
}
I've tried:
Going through the gqlgen documentation, the GraphQL schema, How to GraphQL, and several examples like this and this. And 1.5 days' worth of googling.
Permutating through a lot, a lot of different shapes in my curl request. This one seems the closest:
curl -v http://localhost:8080/query
-H "Content-Type: application/json"
-d '{ "query":
{ "createScreenshot":
{"username": "Odour",
"url": "google.com",
"description": "just another screenshot",
"filename": "testimage"
}
}
}'
But it fails with:
* timeout on name lookup is not supported
* Trying ::1...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0* Connected to localhost (::1) port 8080 (#0)
> POST /query HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.47.1
> Accept: */*
> Content-Type: application/json
> Content-Length: 146
>
} [146 bytes data]
* upload completely sent off: 146 out of 146 bytes
< HTTP/1.1 400 Bad Request
< Date: Sat, 19 Jan 2019 21:00:15 GMT
< Content-Length: 149
< Content-Type: text/plain; charset=utf-8
<
{ [149 bytes data]
100 295 100 149 100 146 149 146 0:00:01 --:--:-- 0:00:01 145k{"errors":[{"message":"json body could not be decoded: json: cannot unmarshal object into Go struct field params.query of type string"}],"data":null}
* Connection #0 to host localhost left intact
Help?
The value of query
in the JSON payload needs to be a string containing the GraphQL query, not an object like you are using, for example:
$ curl \
-H "Content-Type: application/json" \
-d '{ "query": "mutation { createScreenshot(input: { username: \"Odour\" }) { id } }" }' \
http://localhost:8080/query
Note that you need to escape the double quotes within the query string.
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