不務正業菸酒生

1. Open terminal.

2. Switch to the heroku app repository which name you want to change.

3. Type: heroku apps:rename your-new-appname (Name must start with a letter and can only contain lowercase letters, numbers, and dashes.)

4. Then type: heroku open to open your app.

5. You will see your url become https://your-new-appname.herokuapp.com/ on your web browser.

6. Done!

Notice! After change the appname, your old app url will become unavailable.

Actually, this is my homework, I tried to record the step for how I resolve this issue.

I had read some articles and tried many ways(include heroku official document),
but it didn't work.

So I tried to read amazon official document and did some settings myself. Finally,
it works fine.

following are my steps:
(I assume that your app have already run well on heroku)

first, add this gem to your gemfile:

gem 'aws-sdk'

bundke install

add aws.yml under config folder:

development:

  access_key_id: your access key id

  secret_access_key: your secret access key


production:

  access_key_id: your access key id

  secret_access_key: your secret access key

then restart your rails server(for local test)

model action:

has_attached_file :image, :styles => { :medium => "300x300>",
                                       :small => "150x150",
                                       :thumb => "100x100>" },
                          :storage => :s3, 
                            :s3_protocol => 'http', 
                            :s3_host_name => 'your host name',
                            :bucket => 'bucket name'

Done! Paperclip will save your images on amazon s3 automatically!