How to access arguments from higher levels

[jwfehr]

Ex query
User(id: 1234) { userIsTeamLeader(teamed: 6) }

How would I access the user id in the resolve_userIsTeamLeader function? I am aware of contexts but that is not what I am looking for in this case. I want to access a higher level argument. Is this possible?

[angieellis]

I've been trying to find a solution to this myself. The only way I've found is through the info parameter in the resolve method. That holds all the arguments, models, and requested fields in the query. However, its a bit messy to go that route because you have to parse through it. Would be great to have a cleaner/easier way to do this.

[jwfehr]

Is there any documentation for the info object and how to parse through it? or can someone point me to the code where it is formed?

[yfilali]

@syrusakbary showed an example of that here: #348 (comment)

    def get_type(_type):
        if isinstance(_type, (GraphQLList, GraphQLNonNull)):
            return get_type(_type.of_type)
        return _type

    def get_fields(info):
        fragments = info.fragments
        field_asts = info.field_asts[0].selection_set.selections
        _type = get_type(info.return_type)

        for field_ast in field_asts:
            field_name = field_ast.name.value
            if isinstance(field_ast, FragmentSpread):
                for field in fragments[field_name].selection_set.selections:
                    yield field.name.value
                continue

            yield field_name

Also, for the original question, by the time you get to resolve_userIsTeamLeader, I am assuming you have already a resolved user in which case the resolve_userIsTeamLeader has access to the parent user object. Maybe try something like this?

    def resolve_userIsTeamLeader(self, args, context, info):
        print(self.id)

[jwfehr]

Apologies for the delay, I am continuing to work this problem and am having issues. When I look at the field_asts for the info object in my user class I can see my teamID argument as part of the selection set which includes userIsTeamLeader, however when I look at the field_asts for the info object in my resolve_userIsTeamLeader function the only field that is present is the userIsTeamLeader with its argument, is there any way to access the user field_asts from within my resolve_userIsTeamLeader function?

[angieellis]

I'm sorry. That only works the other way around, when you are trying to access child arguments from the parent. In that case, you should go with what @yfilali demonstrated with self. You should have the first part of the argument resolved in self with the User object. So you should be able to access the id field from there.

[angieellis]

@jwfehr I looked at this again today. You can access the parent arguments in the info object, but not in the field_asts attribute. Try the operation attribute (info.operation). That seems to have all arguments in both contexts.

[jwfehr]

@angieellis Thanks very much for the help, I will take a look at that.

[nylocx]

Hi, I have the same problem and I can't get the self solution to work.
I tried to add a minimal example to the playground at:
https://goo.gl/gd1CgM

Do I really have to parse the whole info object just to get to the filter value?

I found a workaround https://goo.gl/BqMtjV
But I don't really like it.

[Zevgon]

For anyone else who thinks that the above solutions are too hard, my workaround was to add the arguments to info.context in the higher level resolve method. Not pretty, but very easy.

[pcattori]

@Zevgon not sure exactly how to "add arugments to info.context". could you provide an example?

[pcattori]

maybe like this?

def resolve_parent(self, info, arg):
        info.context.args = dict(arg=arg)
        return ChildType()

...

class Child(graphene.ObjectType):
    some_field = ...
    def resolve_some_field(self, info):
        return info.context.args.get('arg')

though I wish something like this would be possible, to make namespacing easier:

def resolve_parent(self, info, arg):
        return ChildType(arg=arg)

...

class Child(graphene.ObjectType):
    def resolve_some_field(self, info):
        return self.args.get('arg')

[Zevgon]

@pcattori Yes, your first example is exactly what I mean. About your second example, I think that's possible if you access arg directly from self? Pretty sure this works:

def resolve_parent(self, info, arg):
        return ChildType(arg=arg)

...

class Child(graphene.ObjectType):
    def resolve_some_field(self, info):
        return self.arg

Although I still prefer not doing that type of thing in cases where the child inherits from DjangoObjectType because of the possibility of arg clashing with one of the model's property names.

[ekampf]

Though using the context solution usually work it has some edge cases when runnning resolvers in parallel.
For example:

{
   product1: product(id: "1") { id, name, ...}
   product2: product(id: "2") { id, name, ...}
}

if resolve_product sets something in context, say context['current_product'] = self then it might be a problem...

[jkimbo]

Hi @jwfehr . We're currently going through old issues that appear to have gone stale (ie. not updated in about the last 3 months) to try and clean up the issue tracker. If this is still important to you please comment and we'll re-open this.

Thanks!