Rails API issue with devise routes

Question

I am creating an api in rails and I am implementing the authentication with devise gem. Right now I am creating a custom verify endpoint but I am getting the following error:

Unknown action
Could not find devise mapping for path "/api/v1/verify?confirmation_token=qzfNwsjp3UUPDc7VXrUG".
This may happen for two reasons:
1) You forgot to wrap your route inside the scope block. For example:
devise_scope :user do
get "/some/route" => "some_devise_controller"
end
2) You are testing a Devise controller bypassing the router.
If so, you can explicitly tell Devise which mapping to use:
@request.env["devise.mapping"] = Devise.mappings[:user]

Rails.application.routes.draw do
  namespace :api do
    namespace :v1 do
      devise_for :users, path: "", path_names: {
        sign_in: "login",
        sign_out: "logout",
        registration: "signup",
        confirmation: "confirm"
      }, controllers: {
        sessions: "api/v1/users/sessions",
        registrations: "api/v1/users/registrations",
        confirmations: "api/v1/users/confirmations"
      }
      devise_scope :user do
        get "verify", to: "users/confirmations#verify"
      end
    end
  end
end

This is my confirmations_controller.rb:

# frozen_string_literal: true

class Api::V1::Users::ConfirmationsController < Devise::ConfirmationsController
  respond_to :json
  prepend_before_action { request.env["devise.mapping"] = Devise.mappings[:user] }

  def verify
    token = params[:confirmation_token].to_s
    user = User.confirm_by_token(token)

    if user.errors.empty?
      render json: { message: "Email confirmed successfully." }, status: :ok
    else
      render json: { message: "Email confirmation failed.", errors: user.errors.full_messages }, status: :unprocessable_entity
    end
  end
end

And this is how I have my controllers:

app
 |-controllers
    |-api
       |-v1
          |-users
             |-confirmations_controller.rb
             |-passwords_controller.rb
             |-registrations_controller.rb
             |-sessions_controller.rb
             |-unlocks_controller.rb

More information:

"devise", "~> 4.9", ">= 4.9.4"
ruby-3.4.5
Rails 8.0.3

Can you please edit and post your error as text instead of an image? — Wyck
– Wyck, Commented Sep 30 at 14:29

vibhuk · Accepted Answer · 2025-10-06 11:22:36Z

0

That's a routing issue when mixing Devise with Rails namespacing!

The core problem is that your custom devise_scope route is being defined within the namespaces (api/v1) but is not correctly resolving to the full, namespaced controller path.

get "verify", to: "api/v1/users/confirmations#verify"

This should fix your issue!

answered Oct 6 at 11:22

vibhuk

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