Tips for initializing an array within the argument of a GraphQL query using the GraphQL Code First methodology

While implementing the GraphQL Code First Approach, I encountered an issue where I wanted to pass the same argument for createUser in createManyUser, but as an array to create multiple users at once. Despite my efforts to find a solution within the GraphQL Code First Approach documentation, I was unable to do so.

https://i.sstatic.net/DTjk6.png

The Code

export const createUser = {
    type: userType,
    args: { 
        email: { type: string },
        username: { type: string },
        firstName: { type: string },
        lastName: { type: string }
    },
    resolve: async (_, args, { userAuth }) => {
        try {
            const user = await db.models.userModel.create(args);
            return user;
        } catch (error) {
            throw Error(`${error.message}`)
        }
    }
}

export const createManyUser = {
    type: new GraphQLList(userType),
    args: [{ 
        email: { type: string },
        username: { type: string },
        firstName: { type: string },
        lastName: { type: string }
    }],
    resolve: async (_, args, { userAuth }) => {
        try {
            const user = await db.models.userModel.bulkCreate(args);
            return user;
        } catch (error) {
            throw Error(`${error.message}`)
        }
    }
}

Answer №1

Simply putting the args options in an array won't suffice when working with GraphQL. If you want to indicate that you are expecting a list of items, you need to explicitly construct a GraphQLList type.

Furthermore, when creating a mutation field that needs to accept a list of named items, you cannot just pass in the list directly. Instead, you must define one named argument within the mutation that expects a list of input objects. For example:

export const createManyUser = {
    type: new GraphQLList(userType),
    args: {
        inputs: { type: new GraphQLList(new GraphQLNonNull(new GraphQLInputObjectType({
            name: 'CreateUserInput',
            description: 'Input payload for creating user',
            fields: {
                email: { type: string },
                username: { type: string },
                firstName: { type: string },
                lastName: { type: string }
            }
        })))
    },
    resolve: async (_, args, { userAuth }) => {
        const user = await db.models.userModel.bulkCreate(args.inputs);
        return user;
    }
}

For more information on this topic, check out this insightful article.

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