class-transformer | Decorator-based transformation serialization | JSON Processing library
kandi X-RAY | class-transformer Summary
kandi X-RAY | class-transformer Summary
In JavaScript there are two types of objects:. Plain objects are objects that are instances of Object class. Sometimes they are called literal objects, when created via {} notation. Class objects are instances of classes with own defined constructor, properties and methods. Usually you define them via class notation. So, what is the problem?. Sometimes you want to transform plain javascript object to the ES6 classes you have. For example, if you are loading a json from your backend, some api or from a json file, and after you JSON.parse it you have a plain javascript object, not instance of class you have.
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class-transformer Key Features
class-transformer Examples and Code Snippets
@Override
public void addTransformer(ClassTransformer transformer) {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public void addTransformer(ClassTransformer transformer) {
transformers.add(transformer);
}
Community Discussions
Trending Discussions on class-transformer
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 am trying to add an Abstract method to serialize my response objects in order to hash the id's. That would require to have a property-based injection in order to not pass lots of variables through the constructor.
The class that will be used to Serialize :
...ANSWER
Answered 2022-Feb-28 at 18:23You're calling new ClassInstance()
so you are 100% in control of the class and it's properties. Nest will not inject anything on a manually instantiated class, because it's not managed by Nest's lifecycle in the first place. You can use moduleRef.create
to have Nest create an instance for you, but once you use the keyword new
you are in charge of that instance.
QUESTION
It's 3 days i am on this problem of E2E tests on my GraphQL application with NestJS + Apollo / Express.
When I am running my app with serverless offline or directly with my main file, it's working perfectly. I have my graph and all things I need :)
But, when I am running E2E tests with Jest, I received an error from the await app.init()
inside the beforeEach
.
After playing with the package.json and dependencies, the error throwed is TypeError: (0 , schema_1.makeExecutableSchema) is not a function
.
Someone have any idea please ? I am totally blocked ... :(
...ANSWER
Answered 2022-Feb-20 at 14:45After many hours of intense programming ... I finally found the problem.
Be careful if you use some "alias" for imports, because it can overwrite some of the packages used.
Here, i use the @graphql
alias, and it breaks all my tests.
When I remove it, the problem disappear.
QUESTION
I'm using Nest.js with Typeorm and library class-transformer
:
ANSWER
Answered 2022-Jan-26 at 09:50You can use transformer
option: Specifies a value transformer (or array of value transformers) that is to be used to (un)marshal this column when reading or writing to the database. In case of an array, the value transformers will be applied in the natural order from entityValue to databaseValue, and in reverse order from databaseValue to entityValue.
transformer
has two methods:
to
: Used to marshal data when writing to the database.from
: Used to unmarshal data when reading from the database.
QUESTION
Folks, I've been trying to implement an application using angular with angular universal and NestJs. I believe that is possible to seize the nest server not only for SSR, but also to also provide API endpoints.
I've made the setup recommended on https://github.com/nestjs/ng-universal using ng add @nestjs/ng-universal
, pretty standard. After that I added my code to the angular src folder and installed the needed dependencies.
The problem is that when I try to import a module to nest app.module, I get the following error:
Error: Module not found: Error: Can't resolve 'class-transformer/storage'
I've tried to use webpack, but since my knowledge on webpack is petty, the results were failure after failure, as expected.
First, is it possible to seize the server also to provide endpoints? Second, what should I do to resolve this module?
Please find below the repository for reproducing the issue:
https://github.com/vitordhers/universal-nest
Thanks in advance
...ANSWER
Answered 2022-Jan-22 at 16:04Just faced the exact problem, and when I saw your post my glance of hope just disappeared after I saw the date and zero answers :P
Anyway, ended up here https://github.com/typestack/class-transformer/issues/563 to finally downgrading the class-transformer package to 0.3.1
Worked for me and I hope it does for you too:
QUESTION
I'm working on a NestJs app with graphql, and I'm trying to sanitize my resolvers inputs with class-transformer like this :
...ANSWER
Answered 2022-Jan-21 at 15:14To use the @Transform()
decorator, you need to have the ValidationPipe
bound to the route, resolver, or server, and you need to set the transform
option to true
QUESTION
I'm using nestjs with class validator to validate env variables, configuration.service.ts
is getting its values from configService file which get what it needs from .env and put it in a json object.
In the port and timeout properties I expect to receive a string since it came from a .env file, the decorator @Type(() => Number)
will try to convert whatever it receives into a Number. As far I'm concerned, the decorator only runs as the function call ends, so the function takes a string and returns a string and after that the string is casted into a Number.
The problem is the properties port and connectTimeoutMS expects a Number, the typescript lint claims it's receiving a string, looks like it's not recognizing the cast decorator. I want to know whether there's a way to get around this or I have to drop the cast decorator.
configuration.service.ts
...ANSWER
Answered 2021-Dec-15 at 04:21In the following line you're (not TS) telling to TSC that this.configService.timeOut
is an string
QUESTION
I have a Dto which looks like this:
...ANSWER
Answered 2021-Dec-11 at 13:33This is a common import mistake:
ObjectId can be imported from mongoose and from mongoDB.
The mongoose import is a Type
The mongodb import is a class representation of the bson ObjectId Type
So to fix this issue change your import to:
import { ObjectId } from "mongodb";
But actually there is an option to validate MongoIds with this:
QUESTION
I'm currently working on a NestJS Project in which i have to store loads of data in a single database table. so i created an entity, a repository, a dto and the route in order to store everything. my dto is, just as my entity, extremely long and packed with alot of variables i have to store. pretty much every variable in my dto is optional and in the entity everything is nullable so i have to verify wether that value exists or not before creating a dataset for it.
my entity:
...ANSWER
Answered 2021-Sep-23 at 08:54You can check the DTO object and delete the empty properties: here's the solution:
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