DateScalarType, DateTimeScalarType.php and JsonScalarType.php mistake?

[fvromera]

Hi,

I recently installed your phalcon-graphql-boilterplate to test Phalcon and GraphQL worlds, because them looks very powerful and the best options in their sectors.

Testing your project, when I try to introduce date/datetime fields I have a problem, I get all the time errors like: "date is expected, '2017-10-27' found', but this format is correct.

So, when I verify this format in their classes and found it on redound/phalcon-graphql project, inside the folder src/PhalconGraphQL/Definition/ScalarTypes/, maybe I'm wrong, but when I modified these files it works (because not found StringValue y IntValue in GraphQL\Language\AST):

1. Changes in JsonScalarType.php

remove: use GraphQL\Language\AST\StringValue;
add: use GraphQL\Language\AST\StringValueNode;

remove: if ($ast instanceof StringValue) {
add: if ($ast instanceof StringValueNode) {

2. Changes in DateTimeScalarType.php

remove: use GraphQL\Language\AST\IntValue;
add: use GraphQL\Language\AST\IntValueNode;
remove: use GraphQL\Language\AST\StringValue;
add: use GraphQL\Language\AST\StringValueNode;

3. Changes in DateScalarType.php

remove: use GraphQL\Language\AST\IntValue;
add: use GraphQL\Language\AST\IntValueNode;
remove: use GraphQL\Language\AST\StringValue;
add: use GraphQL\Language\AST\StringValueNode;

remove: if ($ast instanceof StringValue || $ast instanceof IntValue) {
add: if ($ast instanceof StringValueNode || $ast instanceof IntValueNode) {

I hope this help a little bit your project :)