Error with Variables on POST request

[timack]

I'm using a React App on the front end to communicate with the CraftQL API endpoint, I'm also using the graphql.js library to make the requests.

I'm getting this error:

Argument 1 passed to GraphQL\Validator\Rules\QueryComplexity::setRawVariableValues() must be of the type array or null, string given, called in /var/www/vendor/webonyx/graphql-php/src/GraphQL.php on line 137

The request is set up on the front end as follows:

    var getEntries = graph(`query fetchSection($section:[SectionsEnum]) {
      entries(section:$section) {
        ... on Blog{
          id
          title
          body {
            content
          }
          blogCategory {
            title
          }
          blogTags {
            title
          }
        }
      }
    }
    `)

    getEntries({
      section: 'blog'
    })

The issue seems to be that that the POST variables data is not json_decoded like the GET variables in ApiController.php:

        if (Craft::$app->request->isPost && $query=Craft::$app->request->post('variables')) {
            $variables = $query;
        }
        else if (Craft::$app->request->isGet && $query=Craft::$app->request->get('variables')) {
            $variables = json_decode($query, true);
        }

Should be:

        if (Craft::$app->request->isPost && $query=Craft::$app->request->post('variables')) {
            $variables = json_decode($query, true);
        }
        else if (Craft::$app->request->isGet && $query=Craft::$app->request->get('variables')) {
            $variables = json_decode($query, true);
        }

Related #71