在Rails 4中使用gmail gem

Question

I'm trying to use the nu7hatch/gmail gem with rails and I've run into some problems. To rule out a conflict with the rest of my app I started a new c9.io instance with an absolute minimum of code and still got the same problem. I changed the basic Rails scaffold as follows:

Gemfile (added):

gem 'gmail'

routes.rb (added):

root 'welcome#index'

welcome_controller.rb:

class WelcomeController < ApplicationController
  def index
    Gmail.connect("username", "password") do |gmail|
      @emails=gmail.inbox.find(:unread)
    end
  end
end

index.html.erb (view):

<%= @emails.each do |email| %>
<p><%= email.subject %></p>
<% end %>

When I visit the root of my app, I get the following error: cannot load such file -- mime/message

Rails tell me that this error refers to the line: @emails=gmail.inbox.find(:unread)

Does anyone have any ideas how I can make this work please?

Answer 1

I'm not sure if you've answered this by now or not, but I thought I would add what I found. I think the correct way to do it would be to set up something in config/initializer like what omniauth does. But I'm just using the gem for a small personal project so, I decided to build a gmail_client model, and tell the controller to use that.

//gmail_client.rb

require 'active_model'

class GmailClient
  include ActiveModel::Model

  def build
    Gmail.connect!('some_email', 'some_password')
  end

end

I decided to go with ActiveModel because I didn't want this sort of thing stored in a DB.

And then in the controller do something like:

//some_controller
...

def index
  gmail = GmailClient.new.build
  @emails = gmail.inbox.find(:unread)
end

...