Passing array as argument in GraphQL

Question

I have started working on GraphQL.My schema contains one list item too.

Following is the code of my schema:

var userType = new graphql.GraphQLObjectType({  
 name: 'user',
 fields: function () {
  return {
    _id: {
    type: graphql.GraphQLID
  },
  name: {
    type: graphql.GraphQLString
  },
  age: {
    type: graphql.GraphQLString
  },
  degrees:[
  {type:graphql.GraphQLList}
  ]
}
  }
   });

AND the query is as follows:

  var QueryType = new graphql.GraphQLObjectType({  
  name: 'Query',
  fields: () => ({
    userArr: {
      type: new graphql.GraphQLList(userType),
      args:{
         degrees:{type:new graphql.GraphQLList(userType)}
      },
     resolve: function(source, args) {
        console.log(args);
        resolve(args);
      }
    }
})
})

I got this error.

Basically i need to post the array from client graphql query and have to define query accordingly which i am unable to achieve. Any suggestions because i can't find any help over this issue..

Lucas Blancas · Accepted Answer · 2017-09-09 18:06:05Z

4

GraphQLObjectType is not a valid input type.

See Mutations and Input Types

"Input types can't have fields that are other objects, only basic scalar types, list types, and other input types."

You can use the suggestion above because GraphQLString is a scalar

degrees:{
    type:new graphql.GraphQLList(graphql.GraphQLString)
}

Otherwise, you would need to define a GraphQLInputObjectType

const userInputType = new GraphQLInputObjectType({
    name: 'userInput',
    fields: { /* put your fields here */ }
});
/* some code in between */

degrees:{
    type:new graphql.GraphQLList(userInputType)
}

answered Sep 9, 2017 at 18:06

Lucas Blancas

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Comments

Justin · Accepted Answer · 2016-11-18 23:11:41Z

2

I did something very similar recently. Your input arguments don't need to hold to the same type system as the when it's formatting the output data to send back. So your arg just needs to simply accept a list of strings or objects, or whatever standard type you want to send in.

In this case, I updated it to accept a list(array) of strings.

 var QueryType = new graphql.GraphQLObjectType({  
  name: 'Query',
  fields: () => ({
    userArr: {
      type: new graphql.GraphQLList(userType),
      args:{
         degrees:{type:new graphql.GraphQLList(graphql.GraphQLString)}
      },
     resolve: function(source, args) {
        console.log(args);
        resolve(args);
      }
    }
})
})

Also, I noticed on your user type, you have degrees surrounded with array brackets. Similar to your degrees input argument, you'll be outputting an array of strings. Try something like this:

  degrees:{
    type:new graphql.GraphQLList(graphql.GraphQLString)
  }

Happy coding!

edited Nov 18, 2016 at 23:11

answered Nov 16, 2016 at 17:29

Justin

3,0693 gold badges29 silver badges47 bronze badges

6 Comments

N.A Over a year ago

I have tried this too now it is giving this error. user.degrees field type must be Output Type but got: undefined.

N.A Over a year ago

can u please confirm that the code in userType is correct or not?

Justin Over a year ago

Gotcha, could you post up your userType? just edit your original post and post a github gist code snippit if it's large

N.A Over a year ago

my question already contains the userType.u can see the first code block.

Justin Over a year ago

Wow, not sure how I missed that O_O. Anywho, I updated my answer, looks like you just needed to format things differently to handle lists. Let me know if that works.

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