Sending Session Cookies with Axios
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This is about class-validator, nodejs.
https://github.com/typestack/class-validator
Installation class-validator
This is a validation library that is used annotations to set the validation rules in a model class properties.
It is easy to use this library with document. But Unique check was gotcha for me.
Unique validation with class-validator
For example Hoge class is the model for “hoge” table, the following is to check a email address unique.
import {
validate,
registerDecorator,
ValidationOptions,
ValidatorConstraint,
ValidatorConstraintInterface,
ValidationArguments
} from "class-validator";
export class Hoge {
@Unique({
message: "This email address is already in use"
})
public email: string | null = null;
}
@ValidatorConstraint({async: true})
export class UniqueConstraint implements ValidatorConstraintInterface {
async validate(value: any, args: ValidationArguments) {
// get records that equal the `email` value from DB.
// If exist the `email` value in target table, return false. (unique validation error)
return true
}
}
export function Unique(validationOptions?: ValidationOptions) {
return function (object: Object, propertyName: string) {
registerDecorator({
target: object.constructor,
propertyName: propertyName,
options: validationOptions,
constraints: [],
validator: UniqueConstraint
});
};
}
It can validate a value unique with “validate" method.
const hoge = new Hoge()
hoge.email = '[email protected]' // already using email address
validate(hoge).then(errors => {
// this email address is already in use
});
(Article migrated from another blog)
