Enforce validation rules on a nested object by referencing the properties of its parent class

Question

Enforce validation rules on a nested object by referencing the properties of its parent class

How can a field in a child object be validated based on properties of the parent object's structure? For example, in the given structure, only the field first.name is not required when the fields id and dateOfBirth (dob) are defined.

@InputType()
export class GetEligibilityArgs {       
  @Field((type) => NameInput)
  @ValidateNested()
  @Type(() => NameInput)
  name: NameInput;
 
  @Field({ nullable: true })
  @ValidateIf((o: GetEligibilityArgs) => {
    return !(o.name?.first && o.name?.last && o.dateOfBirth);
  })
  @IsNotEmpty({ message: 'id is required' })
  id?: string;

  @Field({ nullable: true })
  @ValidateIf((o: GetEligibilityArgs) => {   
    return !(o.id && o.name?.first && o.name?.last);
  })
  @IsNotEmpty()
  dateOfBirth?: string;
}

Nested Object

@InputType()
export class NameInput {
  @Field({ nullable: true })
  @IsNotEmpty()
  first?: string;

  @Field({ nullable: true })
  @IsNotEmpty()
  last?: string;
}

Valid Inputs

id, name.first, name.last
id, name.first, dob
id, name.last, dob
name.first, name.last, dob

all other inputs are considered invalid

typescript graphql nestjs class-validator

Answer 1

Answer №1

Here is my unique solution, please provide feedback for improvements.

Creating a Custom Validation Constraint

@ValidatorConstraint()
export class CustomValidationConstraint implements ValidatorConstraintInterface {
  validate(
    { id, name, dateOfBirth }: ValidationArgs,
    validationArguments: ValidationArguments,
  ) {
    if (id && name?.first && name?.last) {
      return true;
    }
    if (id && name?.first && dateOfBirth) {
      return true;
    }
    if (id && name?.last && dateOfBirth) {
      return true;
    }
    if (name?.first && name?.last && dateOfBirth) {
      return true;
    }
    return false;
  }

  defaultMessage(args: ValidationArguments) {
    return 'Eligibility requires 3 of the following 4 fields (id, name.first, name.last, dateOfBirth)';
  }
}

Wrapper Class for Eligibility Criteria Validation

@ArgsType()
export class EligibilityCriteria {
  @Field((type) => ValidationArgs)
  @Validate(CustomValidationConstraint)
  @Type(() => ValidationArgs)
  @ValidateNested()
  criteria: ValidationArgs;
}

Usage in Resolver Query

 @Query((returns) => Eligibility)
  eligibility(@Args() { criteria }: EligibilityCriteria) {
    // perform mapping and call service 
  }

Standard validator constraints are applied to the ValidationArgs class

Answer 2

Here is my unique solution, please provide feedback for improvements.

Creating a Custom Validation Constraint

@ValidatorConstraint()
export class CustomValidationConstraint implements ValidatorConstraintInterface {
  validate(
    { id, name, dateOfBirth }: ValidationArgs,
    validationArguments: ValidationArguments,
  ) {
    if (id && name?.first && name?.last) {
      return true;
    }
    if (id && name?.first && dateOfBirth) {
      return true;
    }
    if (id && name?.last && dateOfBirth) {
      return true;
    }
    if (name?.first && name?.last && dateOfBirth) {
      return true;
    }
    return false;
  }

  defaultMessage(args: ValidationArguments) {
    return 'Eligibility requires 3 of the following 4 fields (id, name.first, name.last, dateOfBirth)';
  }
}

Wrapper Class for Eligibility Criteria Validation

@ArgsType()
export class EligibilityCriteria {
  @Field((type) => ValidationArgs)
  @Validate(CustomValidationConstraint)
  @Type(() => ValidationArgs)
  @ValidateNested()
  criteria: ValidationArgs;
}

Usage in Resolver Query

 @Query((returns) => Eligibility)
  eligibility(@Args() { criteria }: EligibilityCriteria) {
    // perform mapping and call service 
  }

Standard validator constraints are applied to the ValidationArgs class

Enforce validation rules on a nested object by referencing the properties of its parent class

Answer №1

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