jbuilder: Helper methods not available in partials

Hi,

I can’t to access helper methods from a controller concern in a partial view:

This is where the helper methods are defined.

# app/controllers/concern/user_management.rb
module UserManagement
    extend ActiveSupport::Concern

    included do
        helper_method :current_user, :owner?, :system_user?
    end

    protected
    # ... methods
end

Application controller includes the UserManagement concern.

# app/controllers/application_controller.rb
class ApplicationController < ActionController::Base
    include UserManagement
end

This is just an specific example, but in order to reuse my views, I want to be able to access concern helper methods in partials.

# app/controllers/admin/accounts_controller.rb
module Admin
    class AccountsController < ApplicationController
        # ...
        def show 
        end
        # ...
        private

        def set_account
            @account = Account.find(params[:id])
        end
    end
end

This is the view tree:

app/
    views/
        accounts/
            _account.json.jbuilder
            show.json.jbuilder
        branches/
            _branch.json.jbuilder

Helper methods are available in views:

# app/views/accounts/show.json.jbuilder
#
# I can access owner? and system_user? helper methods from concern here.
#
json.account do
    json.partial! 'accounts/account', account: @account
end

But can’t access helper methods on partials:

# app/views/accounts/_account.json.jbuilder
json.extract! account, :id, :name
# Account has many branches
json.branches do
    json.array! account.branches, partial: 'branches/branch', as: :branch
end

This is the partial where I need to make a decision based on whether the user is a system user or an owner:

# app/views/branches/_branch.json.jbuilder
json.extract! branch, :name
if system_user?
    json.billing_addresses do
        json.array! branch.billing_addresses, partial: 'billing_addresses/billing_address', as: :billing_address
    end
elsif owner?
    json.billing_address do
        json.partial! 'billing_addresses/billing_address', billing_address: branch.billing_addresses.find_by_account(current_user.account_id)
    end
end

Is it possible to execute helper methods from partials? Isn’t it in the same context as the view?

Thanks in advance.