Validation - Transform

Eicrud's transformations happen at the controller level (between the client, and your services).

Entities and commands DTOs are transformed the same way.

Note

Transform happens before validation.

You can use the following decorators to transform your arguments.

$Transform

Transform an argument with the specified function.

import { $Transform } from '@eicrud/core/validation'

export class CmdDto {
    @$Transform((value: string) => value.toUpperCase())
    message: string;
}

You can specify the desired behavior on arrays.

export class CmdDto {
    @$Transform((value: string[]) => value[0])
    array_a: string[];

    @$Transform((value: string) => value.toUpperCase(), { each: true })
    array_b: string[];
}

$ToLowerCase

Transform a string argument to lowercasing.

import { $ToLowerCase } from '@eicrud/core/validation'

export class CmdDto {
    @$ToLowerCase()
    email: string;
}

$Trim

Trim a string argument.

import { $Trim } from '@eicrud/core/validation'

export class CmdDto {
    @$Trim()
    email: string;
}

$Delete

Delete an argument.

import { $Delete } from '@eicrud/core/validation'

export class CmdDto {
    @$Delete()
    frontEndProperty: string;
}