class-validator | Decorator-based property validation for classes | Validation library
kandi X-RAY | class-validator Summary
kandi X-RAY | class-validator Summary
Decorator-based property validation for classes.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of class-validator
class-validator Key Features
class-validator Examples and Code Snippets
class ArticleParamDTO {
@Matches('[a-z0-9\-]+') // comes from class-validator
article: string;
}
@Get(':article')
getIndex(@Param() { article }: ArticleParamDto) {
}
Community Discussions
Trending Discussions on class-validator
QUESTION
The Nestjs module system is great, but I'm struggling to figure out how to take full advantage of it in a Serverless setting.
I like the approach of writing my domain logic in *.service.ts
files, while using *.controller.ts
files to take care of non-business related tasks such as validating an HTTP request body and converting to a DTO before invoking methods in a service.
I found the section on Serverless in the nestjs docs and determined that for my specific use-case, I need to use the "standalone application feature".
I created a sample nestjs app here to illustrate my problem.
The sample app has a simple add()
function to add two numbers. I use class-validator
for validation on the AddDto
class.
ANSWER
Answered 2022-Apr-09 at 00:28It occurred to me while writing this behemoth of a question that I can simply use class-validator
and class-transformer
in my Lambda handler.
QUESTION
This app worked for a long time in docker container and recently it even doesn't launch.
In docker container I've this error:
...ANSWER
Answered 2022-Apr-07 at 18:09The @nestjs/cli
dev dependency should be up on version 8 with the rest of the @nestjs/
dependencies. @nestjs/cli
v5 doesn't have a start
command
QUESTION
I'm trying to use class-validator and class-transformer to perform validation on API requests in a Next.js API route.
I've put together this basic API handler to demonstrate:
...ANSWER
Answered 2022-Mar-29 at 10:37The problem might be that your babel is not configured properly.
Try to put this into your babel.config.js
(create the file if you don’t have it already):
QUESTION
I have this route here:
...ANSWER
Answered 2022-Mar-23 at 19:25Guards are always ran before other enhancers as it is stated in the docs. The only way to run a guard before another guard is to put it at a higher priority (either at a handler level above [e.g. original guard is route handler level so new guard is at controller level]) or to put it before the guard in the @UseGuards()
. The other option you have would be to run a middleware to validate your body here.
QUESTION
Most of my NestJs controllers look the same. They have basic CRUD functionality and do the exact same things.
The only differences between the controllers are:
- the path
- the service that is injected (and the services are all extended from an abstract service)
- the entity that is returned from the methods
- the create, update, and query dtos
Here is an example CRUD controller:
...ANSWER
Answered 2022-Mar-23 at 07:58I have managed to make it work using this answer https://stackoverflow.com/a/64802874/1320704
The trick is to create a controller factory, and use a custom validation pipe.
Here is the solution:
QUESTION
so I was building an API where by user gives us type
and value
in the request body, type
could be CNIC, EMAIL, MOBILE
Now based on the type
I have to validate the value like if EMAIL
is valid or if MOBILE
is valid etc.
So as we can see that value
field depends on the type
field to validate it.
I need a way to handle this using class-validator
validationPipe
.
ANSWER
Answered 2022-Mar-22 at 10:46So at first I quickly opened the docs and started looking up for advance usage and I came to know that custom decorator would definitely help me and it did using bellow example.
validate-value-by-type.decorator.ts
QUESTION
I have an e2e test where I test the registration (email unique)
The Test is:
...ANSWER
Answered 2022-Mar-15 at 10:22I don't see how your E2E test bootstraps the app but make sure all transformation pipes are included and everything else that might be involved altering error response.
To get the same effect in the e2e test always include the setup you have in main.ts
except swagger docs or some unrelated stuff.
in your case, I'd try this
QUESTION
I am trying to run mongoose query in my validator
Hello, I am trying to make a custom decorator which throws an error if a value for that field already exists. I am trying to use the mongoose model inside the class that validates the route. Unlike in resolver/controller, @InjectModel()
does not work in validator class. My validator is like this
ANSWER
Answered 2022-Mar-18 at 10:22According to this issue (you can't inject a dependency)
You should to add in your main.ts
QUESTION
EDIT1:I made a minimum reproduction repository here
code & reproduction steps are available at the repository.
EDIT2: Same error occurs when I embeded the transpiled code on html file.
EDIT3: I tracked down the main cause of this problem.
When I use gas-webpack-plugin, output file pukes this error. Simply removing the plugin solves the problem, but then I cannot access my main function on GAS.
I created a github issue on the official gas-webpack-plugin . Hope there's a workaround for this.
---Original question from here---
I'm using Clasp + Typescript + Webpack + Babel to locally develop GAS with npm libraries.
Until I used decorator in my project, it was working fine. However, using decorator(more precisely, class-validator) results in following error on GAS...
ANSWER
Answered 2022-Mar-11 at 03:37I talked to the author of the gas-webpack-plugin. https://github.com/fossamagna/gas-webpack-plugin/issues/685
When using decorators, gas-webpack-plugin exposes not only main()
but also classValidatorMetadataStorage()
to the top level.
By simply removing this from the transpiled file, I was able to run the code with decorators.
But we now don't have to do this manually now. The author already took care of the situation. As of gas-webpack-plugin@2.2.0, it has include option to avoid unnecessary function exposure.
Usase:
QUESTION
I have a simple controller:
...ANSWER
Answered 2022-Mar-03 at 20:29if password
is optional (ie., can be undefined
), then tell to TS it is: password?: string
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