Unlocking Prisma’s Power: How to Hide Connect/Create Operations on Nested Input Types in Prisma-NestJS-GraphQL

Are you tired of exposing unnecessary create and connect operations on your Prisma-generated GraphQL API? Well, you’re in luck because today we’re going to dive into the world of Prisma-NestJS-GraphQL and explore the secrets of hiding these operations on nested input types. Buckle up, folks, and let’s get started!

What’s the Problem, You Ask?

When you generate your GraphQL API using Prisma-NestJS-GraphQL, it creates a default set of create and connect operations for each model. While this is convenient, it can also lead to security vulnerabilities and unwanted data manipulation. Imagine a scenario where an unauthorized user gets access to your API and starts creating or connecting unwanted data. It’s a nightmare, right?

The Solution: Input Type Wrappers

The solution lies in using input type wrappers to hide the unwanted operations. Input type wrappers are custom input types that wrap around your original input types, allowing you to control what operations are exposed to the outside world.

Step 1: Create a New Input Type Wrapper

Create a new file in your `src` directory, e.g., `input-wrappers.ts`. This file will contain our custom input type wrappers.

// input-wrappers.ts
import { InputType, Field } from '@nestjs/graphql';
import { MyBaseInput } from './my-base.input';

@InputType()
export class MyWrappedInput {
  @Field()
  id: string;

  @Field()
  name: string;

  // Add more fields as needed
}

Step 2: Update Your Resolver

Now, update your resolver to use the new input type wrapper. Let’s assume you have a `createMyModel` resolver that creates a new instance of `MyModel`.

// my-model.resolver.ts
import { Resolver, Mutation, Args } from '@nestjs/graphql';
import { MyWrappedInput } from './input-wrappers';
import { MyModelService } from './my-model.service';

@Resolver()
export class MyModelResolver {
  constructor(private readonly myModelService: MyModelService) {}

  @Mutation('createMyModel')
  async createMyModel(@Args('input') input: MyWrappedInput) {
    return this.myModelService.create(input);
  }
}

Step 3: Update Your Service

Update your service to use the new input type wrapper. In this example, we’ll assume you have a `MyModelService` that handles the creation of `MyModel` instances.

// my-model.service.ts
import { Injectable } from '@nestjs/common';
import { PrismaService } from '../prisma/prisma.service';
import { MyWrappedInput } from './input-wrappers';

@Injectable()
export class MyModelService {
  constructor(private readonly prismaService: PrismaService) {}

  async create(input: MyWrappedInput) {
    return this.prismaService.myModel.create({ data: input });
  }
}

Hiding Connect Operations

Now that we’ve wrapped our input type, let’s hide the connect operations. We’ll use Prisma’s `create` method with the `select` option to specify which fields to return.

// my-model.service.ts (updated)
import { Injectable } from '@nestjs/common';
import { PrismaService } from '../prisma/prisma.service';
import { MyWrappedInput } from './input-wrappers';

@Injectable()
export class MyModelService {
  constructor(private readonly prismaService: PrismaService) {}

  async create(input: MyWrappedInput) {
    return this.prismaService.myModel.create({
      data: input,
      select: {
        id: true,
        name: true,
        // Add more fields as needed
      },
    });
  }
}

By using the `select` option, we’re telling Prisma to only return the specified fields, effectively hiding the connect operations.

Hiding Create Operations

To hide the create operations, we’ll use Prisma’s `create` method with the `include` option. This option allows us to specify which relations to include in the response.

// my-model.service.ts (updated)
import { Injectable } from '@nestjs/common';
import { PrismaService } from '../prisma/prisma.service';
import { MyWrappedInput } from './input-wrappers';

@Injectable()
export class MyModelService {
  constructor(private readonly prismaService: PrismaService) {}

  async create(input: MyWrappedInput) {
    return this.prismaService.myModel.create({
      data: input,
      include: {
        // Add more relations as needed
      },
    });
  }
}

By using the `include` option, we’re telling Prisma to only include the specified relations in the response, effectively hiding the create operations.

Conclusion

And there you have it! By using input type wrappers and Prisma’s `create` method with the `select` and `include` options, we’ve successfully hidden the connect and create operations on our nested input types in Prisma-NestJS-GraphQL. This approach not only improves security but also provides a more controlled and flexible API.

Operation	Solution
Hide Connect Operations	Use Prisma’s `create` method with the `select` option
Hide Create Operations	Use Prisma’s `create` method with the `include` option

Remember, security and flexibility go hand-in-hand when it comes to API design. By hiding unnecessary operations, you’re not only protecting your data but also providing a more tailored experience for your users.

Additional Tips and Tricks

1. Use input type wrappers for all your models to maintain consistency and flexibility.

2. Experiment with different `select` and `include` options to customize your API responses.

3. Consider using GraphQL directives to further customize your API.

4. Don’t forget to update your GraphQL schema to reflect the changes.

With great power comes great responsibility. Now that you’ve mastered the art of hiding connect and create operations on nested input types, go forth and create a more secure, flexible, and amazing API!

Frequently Asked Questions

• Q: What if I have multiple nested input types?

  A: You can create multiple input type wrappers and use them accordingly.

• Q: Can I use this approach for other Prisma operations?

  A: Yes, you can use this approach for other Prisma operations like update and delete.

• Q: How do I handle errors and exceptions?

  A: You can use try-catch blocks and Error objects to handle errors and exceptions.

There you have it, folks! A comprehensive guide to hiding connect and create operations on nested input types in Prisma-NestJS-GraphQL. If you have any more questions or need further assistance, feel free to ask in the comments below.

Frequently Asked Question

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