How to use instance variables?

[Barnett Klane]

I am trying to use an instance variable (such as an object from the db), within the content snippet yet am unsure how to proceed? (since it seems only helpers are given for content from the README) When I define them within the email action and just try to call within the view page I get an error.

[Gleb Mazovetskiy]

You can define helper methods in helpers.

# app/helpers/emails_cms_helper.rb
module EmailsCmsHelper
  def greeting
    t('email.greeting', name: @user.name)
  end
end

class MyMailer ...
  helper :emails_cms

Use like so:

{{cms:helper:greeting}}
You have one new message

I've updated the wiki with this example.

[Barnett Klane]

I seem to still have a problem, am getting the error:

undefined method `f_name' for nil:NilClass

It is showing the following line as the error:

<%= greeting() %>

The helper looks like this:

module EmailsCmsHelper
  def greeting
    t('email.greeting', name: @donor.f_name)
  end
end

The mailer looks like this:

class Notifier < ActionMailer::Base
  helper :emails_cms

  default from: "[e-mail]"

  def initial_donation_email(donor)
    mail(
      subject: cms_email_subject(name: donor.f_name),
      to: donor.email
    )
    @donor = donor
  end
  ...
end

It seems the @donor instance isn't accessible to the helper but unsure how I can fix it?

[Gleb Mazovetskiy]

@blklane Try putting @donor = donor before the mail(...) call

[Barnett Klane]

@glebm yup, that does it, thank you!