REST depends on our endpoints being clearly defined and this is usually done using the frontend as a guide, cause obviously we want to provide the exact data the frontend needs. But this is a problem. What if the frontend requirements change and we need an extra data field that is only available through a separate endpoint? Now we have to make two HTTP requests and we will have extra data which is wasteful for mobile internet usage.
The other solution is to create a new endpoint on the backend, which is expensive. Essentially, a REST api is too low level. We need something that offers a higher level of abstraction and that is GraphQL. GraphQL is a query language specification created originally by Facebook as a solution to the problems described above. GraphQL offers a way for frontends to describe the exact data needed and the shape of the data.
The data is defined on the backend as a GraphQL schema. A GraphQL request known as a Query looks like this:. You might notice that the data sent back follows the exact shape of the query.
What about adding data though? We do that using GraphQL Mutations which look like this:. Of course there is a lot more to GraphQL than just that. If you want a more in depth look into what GraphQL is capable, there is no better place to start than the official documentation.
The database I will choose to integrate with is Postgres although you can use any database of your choice. If you do not have Postgres installed, follow the steps to install Postgres on your OS. Once postgres is installed, we will create a new database using the Postgres CLI. On Linux and MacOS the steps will be as follows:.
Nestjs Typeorm Graphql Dataloader tutorial with Typescript
Firstly we will install the necessary dependencies. Next we will create a config file at the root of our project and call it ormconfig.
This file is automatically pulled in by TypeORM. In NestJS each component has its own module where we encapsulate everything associated to the module, including providers, controllers and other modules. The root module file is app. We will use it to set up a schema for a pokemon componenent which we will soon define. We will have a singular entity called pokemon. Make a directory inside the src folder and call it pokemon.
Inside it we will make a pokemon. Now that we have our entity we can inject it into our pokemon module. Next we will create a DTO Data Transfer Objectwhich is a model that defines the shape of the data we are expecting to be sent. Make a folder inside pokemon called dto and create a file called add-pokemon.
Similarly we will set up a input object, which will define the shape of the input parameters to our mutation query. In an input folder create pokemon.GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. GraphQL queries always return predictable results.
GraphQL queries access not just the properties of one resource but also smoothly follow references between them.
Access the full capabilities of your data from a single endpoint. Know exactly what data you can request from your API without leaving your editor, highlight potential issues before sending a query, and take advantage of improved code intelligence. Aging fields can be deprecated and hidden from tools. GraphQL creates a uniform API across your entire application without being limited by a specific storage engine.
Facebook's mobile apps have been powered by GraphQL since A GraphQL spec was open sourced in and is now available in many environments and used by teams of all sizes. Get Started Learn More. Get many resources in a single request GraphQL queries access not just the properties of one resource but also smoothly follow references between them.
NestJS GraphQL API with TypeORM and Postgres
Move faster with powerful developer tools Know exactly what data you can request from your API without leaving your editor, highlight potential issues before sending a query, and take advantage of improved code intelligence. Bring your own data and code GraphQL creates a uniform API across your entire application without being limited by a specific storage engine.Nest NestJS is a framework for building efficient, scalable Node.
Nest provides a level of abstraction above these common Node. This allows developers the freedom to use the myriad of third-party modules which are available for the underlying platform.
In recent years, thanks to Node. This has given rise to awesome projects like AngularReact and Vuewhich improve developer productivity and enable the creation of fast, testable, and extensible frontend applications.
The architecture is heavily inspired by Angular. To get started, you can either scaffold the project with the Nest CLIor clone a starter project both will produce the same outcome. To scaffold the project with the Nest CLI, run the following commands.
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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. In some of my GraphQL resolvers I need to access the currently authenticated user. I know that passport will attach the authenticated user to the request object at least I hope that this is correctbut I do not know how to access the request object inside a resolver.
I saw some code that uses Res res: Request as a method parameter in the GraphQL resolver methods, but I always get undefined for res. Authorization and creating JWT tokens works fine. GraphQL guard also works fine for methods that do not need to access the user. But for methods that need access to the currently authenticated user, I see no way of getting it.
Finally found the answer Now everything works as expected. Learn more. Asked 1 year ago. Active 3 months ago. Viewed 4k times. I am currently implementing JWT authentication with Passport. Is there a way to accomplish something like this? This is a better approach in my opinion.
Active Oldest Votes. Preston PHX 4, 2 2 gold badges 12 12 silver badges 25 25 bronze badges. Thank you! Also, as this is a working answer you should accept it even if it's your own. Thanks again, I searched for a solution for at least an hour before finding this and it worked perfectly.
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Technical site integration observational experiment live on Stack Overflow. Dark Mode Beta - help us root out low-contrast and un-converted bits. Question Close Updates: Phase 1.Before we deep dive into integrating all three into a single project.
In case you are missing not, here is the brief introduction. When a request query in GraphQL world triggers, It decides the data flows over the network. Where an endpoint is triggered according to the data and resource. NestJs is a framework used to serve our server needs. It uses Express and Fastify under the hood and has robust support for TypeScript. Which is designed and employed to make the backend structured that is in easy to maintain modules.
Next, we need to create some directories, where our typeorm entities, typeorm migrations, and SQLite database are gonna resides. Typeorm uses epoch time as the prefix for migrations to run migrations in order. You can populate your migrations now with the creation of the table, here is how your migration should look like.
Once migrations are setup, you need to run Typeorm migrations now, Typeorm provides a very easy to use CLI to run all the migrations, it will create a migrations table in the database, where it will keep a record of all the migrations it has applied. Once you execute this command dev. Once you have all the entities setup, you are ready to CRUD records in the database using repositories and map to the above entity models. Since we took the data mapper route, we need to define repositories for each of our entities, so we are going to create a global service repo.
Before that, we have to configure TypeORM in the main module, which in our case is app. We have just completed our setup for Typeorm, using data mapper and we have created migrations and models using typeorm one too many and typeorm many to many relationships.
Open the app. Once you have made changes to both app. Once it runs, open the browser and you can see the following line. Your project is able to query the database. Since we already have installed the required packages above, in case you missed it, install the following package for graphql nestjs typeorm.
Once the above packages are installed, we will modify our entities with type-graphql decorators, so the GraphQL types corresponding to entities are created inside our GraphQL schemas.
To create a type corresponding to the entity we will use ObjectType decorator from the type-graphql package. So you entities would look something like this. Once the type is exposed to the schema, we will start exposing our fields for the type using the Field decorator again from the type-graphql package.
Next, we have to import the GraphQL module in our app. Change your app. GraphQL will generate the schema at the schema. In our resolvers directory, we will create our first resolver author. Since we are working on the author resolver first. We will begin by creating the author.
The first input type will be the one required for our create author mutation responsible for creating a new author record in our database.This project implements user authentication.
Adding other GraphQL schemas to this project will be easy following the same structure. User auth has always been one of the hardest and most common thing to implement, so that is what is implemented in this project. If you recognize an anti-pattern or a better way to do something, please post an issue.
Recommend a role with readWrite. If not set, there will be no expiration. This should be a real email address you own to verify emails are getting out. It is challenging not to repeat the structure of the models in the GraphQL schema, Mongo schema, and Typescript interfaces. The goal is to have one truth point for the models and extend that data when more data is needed. With NestJS 6. This project uses the schema first approach to be language agnostic.
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They contain the GraphQL schema and have properties that every model, at a minimum, should have. It doesn't appear possible without modification of the grahql. Initially username or email were accepted, but for simplicity the schema moved to only username. Both username and email fields are in the JWT data, and because they are both unique, either could be used. The database stores a unique lowercase value for both username and email.
This is to lookup the user's username or email without case being a factor. The normal cased version is used for everything except lookup. GraphQL Schemas are not aware lowercase values exist intentionally. The database handles creating the lowercase values with hooks for save and findOneAndUpdate.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I don't have access to the user from the request in a Guard, is that intentional?
I would like to get the user's roles directly from the user object and only allow users with Admin for specific routes like the full list of users.
I can get the user from the CurrentUser with a Custom Decorator but I can't get the user object inside the guard. I'm trying to get the user from the request, but is that possible in a Guard or not? I tried so many things, I don't know what to do anymore. I also tried to do another Roles Guard with different code and again I'm trying to get the user from the request and I can't get the user from the request.
On your GraphqlPassportAuthGuard. If, for some reason, you don't want the guard to throw when the user is not authenticated, you have to override also the AuthGuard. Learn more. Asked 4 months ago. Active 4 months ago. Viewed times. Active Oldest Votes.
Ghero Ghero 69 2 2 bronze badges. Sorry for the delay, I just tried this and I still have the same result undefinedam I supposed to still calli the same 2 lines after the super. That 2nd line ctx. Would you mind providing the full code of the canActive method?
Am I suppose to delete something or call something else? I'm totally new to NestJS, I'm a little confused. You should await for super. So make your definition of canActivate async and call await super.
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