Rails 4中ActionMailer :: Base：Class的未定义方法'async ='

Question

I am trying to use the new rails 4 asynchronous mailer based on the rails guide here

in my config/application.rb I added

config.action_mailer.async = true

and in my actionMailer I added

class welcomeMailer < ActionMailer::Base
    #self.async = true
end

these results in undefined method async= for ActionMailer::Base:Class when I try to run my rails server . I tried to rake my workers but rake will also fail due to this addition.

Thank you for your help.

Answer 1

So apparently they moved from asynchronous to synchronous with an external queue, and this behavior is used by default:

Action Mailer async flag is true by default using a Synchronous impl

https://github.com/rails/rails/commit/34b23e7110a3a13cf157608cefc9b5701017bf39

Further update:

Apparently they pulled the queuing functionality as well:

Move background jobs to the 'jobs' branch until fully baked. Not shipping with Rails 4.0.

https://github.com/rails/rails/commit/f9da785d0b1b22317cfca25c15fb555e9016accb

Answer 2

I don't think it ever made it!

farleyknight@farleyknight-desktop:~/tmp$ git clone git@github.com:rails/rails.git
Cloning into 'rails'...
remote: Finding bitmap roots...
remote: Counting objects: 394168, done.
remote: Compressing objects: 100% (110181/110181), done.
remote: Total 394168 (delta 286616), reused 387911 (delta 280577)
Receiving objects: 100% (394168/394168), 93.88 MiB | 1.61 MiB/s, done.
Resolving deltas: 100% (286616/286616), done.
farleyknight@farleyknight-desktop:~/tmp$ cd rails/

The only mentions of 'async' are under active_record, action_view/actionpack or the guides.

farleyknight@farleyknight-desktop:~/tmp/rails$ grep async . -r --exclude=*.js
Binary file ./.git/objects/pack/pack-2684dbd9d8af432c397e766784fb5ca058fec4c4.pack matches
./.git/packed-refs:61e31f2c8744eccd07c23d3fad2db9ea8504909b refs/remotes/origin/async
Binary file ./.git/index matches
./activerecord/test/cases/locking_test.rb:# (See exec vs. async_exec in the PostgreSQL adapter.)
./activerecord/lib/active_record/explain.rb:    # asynchronously by the subscriber and returned.
./activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb:            result_as_array @connection.async_exec(sql)
./activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb:            @connection.async_exec(sql)
./activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb:          log(sql, name, binds) { @connection.async_exec(sql) }
./actionview/lib/action_view/helpers/tag_helper.rb:                           autoplay controls loop selected hidden scoped async
./guides/source/security.md:NOTE: _Make sure file uploads don't overwrite important files, and process media files asynchronously._
./guides/source/security.md:The solution to this is best to _process media files asynchronously_: Save the media file and schedule a processing request in the database. A second process will handle the processing of the file in the background.
./guides/source/form_helpers.md:Unlike other forms making an asynchronous file upload form is not as simple as providing `form_for` with `remote: true`. With an Ajax form the serialization is done by JavaScript running inside the browser and since JavaScript cannot read files from your hard drive the file cannot be uploaded. The most common workaround is to use an invisible iframe that serves as the target for the form submission.
./actionpack/test/controller/live_stream_test.rb:    def test_async_stream