GraphQL mutator with required args - graphql

Question

I am writing a mutation for a GraphQL schema:
const Schema = new GraphQLSchema({
mutation: new GraphQLObjectType({
name: 'Mutation',
fields: () => ({
person: {
type: GraphQLString,
args: {
name: {type: GraphQLString},
school: {type: GraphQLString},
},
resolve: mutatePerson,
},
}),
}),
});
I want to ensure that mutatePerson will only work if both name and school arguments are present. How can I check that?

Answer 1

The GraphQLNonNull type wrapper is used to specify both fields and arguments as non-null. For fields, that means the value of the field in the query results cannot be null. For arguments, that means that the argument cannot be left out or have a value of null. So your code just needs to look more like this:
args: {
name: {
type: new GraphQLNonNull(GraphQLString),
},
school: {
type: new GraphQLNonNull(GraphQLString),
},
},

Answer 2

it is better to do it as follow (in the model) if you want to reject empty Strings like "", it is different from Null, this way you can reject both Null and empty "".
const mongoose = require("mongoose");
const Schema = mongoose.Schema;
const buinessSchema = new Schema({
name: { type: String, required: true, unique: true },
address: { type: String, required: true },
phone: { type: String, required: true },
email: { type: String, required: true },
website: { type: String, required: true },
currency: { type: String, required: true },
aboutus: { type: String, required: true },
terms: String,
slogan: String,
logo: { type: String, required: true }
});
module.exports = mongoose.model("Buiness", buinessSchema);