In my app's user settings, a user can subscribe or unsubscribe to a MailChimp list by checking a box. I am having some trouble retrieving the users MailChimp member_id.
I created a .env file with:
MAILCHIMP_API_KEY = "my_api_key"
MAILCHIMP_LIST_ID = "my_list_id"
I created an initializer called gibbon.rb with:
Gibbon::Request.api_key = ENV["MAILCHIMP_API_KEY"]
Gibbon::Request.timeout = 15
I use this method in the user.rb
def mailchimp_news
  @mailchimp_list_id = ENV["MAILCHIMP_LIST_ID"]
  @gibbon = Gibbon::Request.new
  if self.news_email == true
    @gibbon.lists(@mailchimp_list_id).members.update(body: {
    email_address: self.email,
    status: "subscribed",
    merge_fields: {FNAME: self.name,
                   LNAME: ""}
    })
  elsif self.news_email == false
    @gibbon.lists(@mailchimp_list_id).members(member_id).update(body: { status: "unsubscribed" })
end
end
And call it with an after check
after_save :mailchimp_news
I receive this error: undefined local variable or method `member_id'. How do I get the member_id?