Grape params vlidation not working for get action

Question

I'm trying to do a params validation check for my get action. But somehow it's not working. Can someone suggest me how can we do. Below is my code for the same. If I send a request without any parameters, params validation is not happening. May I know the reason for that and how can I fix that please.

module API
  module V1
    class Permissions < Grape::API
      include Defaults

      helpers do
        def ensure_user_exists!
          error!('Not authorized', 401) unless user_by_token.present?
        end

        def user_by_token
          @user ||= User.find_by(token: params[:user_token])
        end
      end

      resource :permissions do
        params do
          requires :user_token, type: String
        end

        before do
          ensure_user_exists!
        end

        resource :documents do
          get :document_details do
            error!('Access Denied', 403) unless user_by_token.manager?
          end
        end
      end
    end
  end
end



localhost:3000/api/permissions/documents/document_details.json returning error in user_by_token method.

Answer 1

You misplaced the params block. You should have placed it before the get block, like this:

module API
  module V1
    class Permissions < Grape::API
      include Defaults

      helpers do
        def ensure_user_exists!
          error!('Not authorized', 401) unless user_by_token.present?
        end

        def user_by_token
          @user ||= User.find_by(token: params[:user_token])
        end
      end

      resource :permissions do

        before do
          ensure_user_exists!
        end

        resource :documents do

          params do
            requires :user_token, type: String
          end
          get :document_details do
            error!('Access Denied', 403) unless user_by_token.manager?
          end

        end
      end
    end
  end
end