Rails validation error messages: Add response code to default validators

Question

I am looking for a best-practise / solution to render responses with different http-response codes than 422 - unprocessable entity.

I have a simple validator:

validates :name, presence: true, uniqueness: {message: 'duplicate names are not allowed!'}

I want to return status code 409 - Conflict (:conflict) when this validation fails. Possible solution:

Add status code to errors hash, e.g. errors.add(status_code: '409'). Then either render the status code from errors, or render 422 if multiple exists.

The problem with the above solution is that I do not know how to call the errors.add function on a 'standard' validator.

My render code:

if model.save
    render json: model, status: :created
  else
    render json: model.errors, status: :unprocessable_entity
  end

Which I would like to extent that it can render different status codes based on validation results.

Why don't you instead of rendering a json, return head :conflict? — Maxim Fedotov
– Maxim Fedotov, Commented Jul 25, 2017 at 19:06
@MaximFedotov The job if this rest api server is purely handling rest calls. It does not need to render anything graphical, just some specified json structures ;) — Kevin van den Bekerom
– Kevin van den Bekerom, Commented Jul 26, 2017 at 8:28

Maxim Fedotov · Accepted Answer · 2017-07-25 19:14:43Z

2

In this case, creating a custom validator might be one approach and you could always expand the complexity

validates_with NameValidator

Custom validator

class NameValidator < ActiveModel::Validator
  def validate(record)
    if record.blank? || Model.where(name: record.name).exists?
      record.errors.add(:base, "Duplicate names not allowed!")
    end
  end
end

answered Jul 25, 2017 at 19:14

Maxim Fedotov

1,3571 gold badge18 silver badges39 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Rails validation error messages: Add response code to default validators

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related