TODO: A simple mutation example about graphql HOT 6 CLOSED

This is another version of the above example, but using graphql-go/handler to create a server that handles GraphQL HTTP requests. (This probably should be in graphql-go/handler)

https://gist.github.com/sogko/7debd336118e5e7c7f65

How to make GraphQL HTTP request using cUrl

In graphql-go-handler, based on the GET/POST and the Content-Type header, it expects the input params differently.
This behaviour was ported from express-graphql.

So given the following query:

mutation M {
  newTodo: createTodo(text: "This is a todo mutation example") {
    text
    done
  }
}

using GET

$ curl -g -GET 'http://localhost:8080/graphql?query=mutation+M{newTodo:createTodo(text:"This+is+a+todo+mutation+example"){text+done}}'

using POST + Content-Type: application/graphql

$ curl -XPOST http://localhost:8080/graphql -H 'Content-Type: application/graphql' -d 'mutation M { newTodo: createTodo(text: "This is a todo mutation example") { text done } }'

using POST + Content-Type: application/json

$ curl -XPOST http://localhost:8080/graphql -H 'Content-Type: application/json' -d '{"query": "mutation M { newTodo: createTodo(text: \"This is a todo mutation example\") { text done } }"}'

Any of the above would return the same output:

 {
   "data": {
       "newTodo": {
         "done": false,
         "text": "This is a todo mutation example"
       }
   }
 }

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Also helpful to note, if there are "optional" params that you don't send in the query you'll have an issue trying to convert nil to string. I found this to be a suitable workaround:

optionalVal, _ := params.Args["optionalVal"].(string)

Prevents panicking. If I'm correct, it will default optionVal to the nil for string.

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Closing issue since an example was added in #189 and even got better in #190

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I've re-written @bbuck's original example here:

https://gist.github.com/sogko/e298f9d1401e0ad736c6

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Thanks @sogko!

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Oops, thanks for catching that @EmergentBehavior 👍🏻

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